FileBackendTest.php

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<?php

class FileBackendTest extends MediaWikiTestCase {

    private $backend;
    private $multiBackend;
    public $singleBackend;
    private $filesToPrune = array();
    private static $backendToUse;

    protected function setUp() {
        global $wgFileBackends;
        parent::setUp();
        $uniqueId = time() . '-' . mt_rand();
        $tmpPrefix = wfTempDir() . '/filebackend-unittest-' . $uniqueId;
        if ( $this->getCliArg( 'use-filebackend=' ) ) {
            if ( self::$backendToUse ) {
                $this->singleBackend = self::$backendToUse;
            } else {
                $name = $this->getCliArg( 'use-filebackend=' );
                $useConfig = array();
                foreach ( $wgFileBackends as $conf ) {
                    if ( $conf['name'] == $name ) {
                        $useConfig = $conf;
                        break;
                    }
                }
                $useConfig['name'] = 'localtesting'; // swap name
                $useConfig['shardViaHashLevels'] = array( // test sharding
                    'unittest-cont1' => array( 'levels' => 1, 'base' => 16, 'repeat' => 1 )
                );
                $class = $useConfig['class'];
                self::$backendToUse = new $class( $useConfig );
                $this->singleBackend = self::$backendToUse;
            }
        } else {
            $this->singleBackend = new FSFileBackend( array(
                'name' => 'localtesting',
                'lockManager' => 'fsLockManager',
                #'parallelize' => 'implicit',
                'wikiId' => wfWikiID() . $uniqueId,
                'containerPaths' => array(
                    'unittest-cont1' => "{$tmpPrefix}-localtesting-cont1",
                    'unittest-cont2' => "{$tmpPrefix}-localtesting-cont2" )
            ) );
        }
        $this->multiBackend = new FileBackendMultiWrite( array(
            'name' => 'localtesting',
            'lockManager' => 'fsLockManager',
            'parallelize' => 'implicit',
            'wikiId' => wfWikiId() . $uniqueId,
            'backends' => array(
                array(
                    'name' => 'localmultitesting1',
                    'class' => 'FSFileBackend',
                    'lockManager' => 'nullLockManager',
                    'containerPaths' => array(
                        'unittest-cont1' => "{$tmpPrefix}-localtestingmulti1-cont1",
                        'unittest-cont2' => "{$tmpPrefix}-localtestingmulti1-cont2" ),
                    'isMultiMaster' => false
                ),
                array(
                    'name' => 'localmultitesting2',
                    'class' => 'FSFileBackend',
                    'lockManager' => 'nullLockManager',
                    'containerPaths' => array(
                        'unittest-cont1' => "{$tmpPrefix}-localtestingmulti2-cont1",
                        'unittest-cont2' => "{$tmpPrefix}-localtestingmulti2-cont2" ),
                    'isMultiMaster' => true
                )
            )
        ) );
        $this->filesToPrune = array();
    }

    private static function baseStorePath() {
        return 'mwstore://localtesting';
    }

    private function backendClass() {
        return get_class( $this->backend );
    }

    public function testIsStoragePath( $path, $isStorePath ) {
        $this->assertEquals( $isStorePath, FileBackend::isStoragePath( $path ),
            "FileBackend::isStoragePath on path '$path'" );
    }

    public static function provider_testIsStoragePath() {
        return array(
            array( 'mwstore://', true ),
            array( 'mwstore://backend', true ),
            array( 'mwstore://backend/container', true ),
            array( 'mwstore://backend/container/', true ),
            array( 'mwstore://backend/container/path', true ),
            array( 'mwstore://backend//container/', true ),
            array( 'mwstore://backend//container//', true ),
            array( 'mwstore://backend//container//path', true ),
            array( 'mwstore:///', true ),
            array( 'mwstore:/', false ),
            array( 'mwstore:', false ),
        );
    }

    public function testSplitStoragePath( $path, $res ) {
        $this->assertEquals( $res, FileBackend::splitStoragePath( $path ),
            "FileBackend::splitStoragePath on path '$path'" );
    }

    public static function provider_testSplitStoragePath() {
        return array(
            array( 'mwstore://backend/container', array( 'backend', 'container', '' ) ),
            array( 'mwstore://backend/container/', array( 'backend', 'container', '' ) ),
            array( 'mwstore://backend/container/path', array( 'backend', 'container', 'path' ) ),
            array( 'mwstore://backend/container//path', array( 'backend', 'container', '/path' ) ),
            array( 'mwstore://backend//container/path', array( null, null, null ) ),
            array( 'mwstore://backend//container//path', array( null, null, null ) ),
            array( 'mwstore://', array( null, null, null ) ),
            array( 'mwstore://backend', array( null, null, null ) ),
            array( 'mwstore:///', array( null, null, null ) ),
            array( 'mwstore:/', array( null, null, null ) ),
            array( 'mwstore:', array( null, null, null ) )
        );
    }

    public function testNormalizeStoragePath( $path, $res ) {
        $this->assertEquals( $res, FileBackend::normalizeStoragePath( $path ),
            "FileBackend::normalizeStoragePath on path '$path'" );
    }

    public static function provider_normalizeStoragePath() {
        return array(
            array( 'mwstore://backend/container', 'mwstore://backend/container' ),
            array( 'mwstore://backend/container/', 'mwstore://backend/container' ),
            array( 'mwstore://backend/container/path', 'mwstore://backend/container/path' ),
            array( 'mwstore://backend/container//path', 'mwstore://backend/container/path' ),
            array( 'mwstore://backend/container///path', 'mwstore://backend/container/path' ),
            array( 'mwstore://backend/container///path//to///obj', 'mwstore://backend/container/path/to/obj' ),
            array( 'mwstore://', null ),
            array( 'mwstore://backend', null ),
            array( 'mwstore://backend//container/path', null ),
            array( 'mwstore://backend//container//path', null ),
            array( 'mwstore:///', null ),
            array( 'mwstore:/', null ),
            array( 'mwstore:', null ),
        );
    }

    public function testParentStoragePath( $path, $res ) {
        $this->assertEquals( $res, FileBackend::parentStoragePath( $path ),
            "FileBackend::parentStoragePath on path '$path'" );
    }

    public static function provider_testParentStoragePath() {
        return array(
            array( 'mwstore://backend/container/path/to/obj', 'mwstore://backend/container/path/to' ),
            array( 'mwstore://backend/container/path/to', 'mwstore://backend/container/path' ),
            array( 'mwstore://backend/container/path', 'mwstore://backend/container' ),
            array( 'mwstore://backend/container', null ),
            array( 'mwstore://backend/container/path/to/obj/', 'mwstore://backend/container/path/to' ),
            array( 'mwstore://backend/container/path/to/', 'mwstore://backend/container/path' ),
            array( 'mwstore://backend/container/path/', 'mwstore://backend/container' ),
            array( 'mwstore://backend/container/', null ),
        );
    }

    public function testExtensionFromPath( $path, $res ) {
        $this->assertEquals( $res, FileBackend::extensionFromPath( $path ),
            "FileBackend::extensionFromPath on path '$path'" );
    }

    public static function provider_testExtensionFromPath() {
        return array(
            array( 'mwstore://backend/container/path.txt', 'txt' ),
            array( 'mwstore://backend/container/path.svg.png', 'png' ),
            array( 'mwstore://backend/container/path', '' ),
            array( 'mwstore://backend/container/path.', '' ),
        );
    }

    public function testStore( $op ) {
        $this->filesToPrune[] = $op['src'];

        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestStore( $op );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestStore( $op );
        $this->filesToPrune[] = $op['src']; # avoid file leaking
        $this->tearDownFiles();
    }

    private function doTestStore( $op ) {
        $backendName = $this->backendClass();

        $source = $op['src'];
        $dest = $op['dst'];
        $this->prepare( array( 'dir' => dirname( $dest ) ) );

        file_put_contents( $source, "Unit test file" );

        if ( isset( $op['overwrite'] ) || isset( $op['overwriteSame'] ) ) {
            $this->backend->store( $op );
        }

        $status = $this->backend->doOperation( $op );

        $this->assertGoodStatus( $status,
            "Store from $source to $dest succeeded without warnings ($backendName)." );
        $this->assertEquals( true, $status->isOK(),
            "Store from $source to $dest succeeded ($backendName)." );
        $this->assertEquals( array( 0 => true ), $status->success,
            "Store from $source to $dest has proper 'success' field in Status ($backendName)." );
        $this->assertEquals( true, file_exists( $source ),
            "Source file $source still exists ($backendName)." );
        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $dest ) ),
            "Destination file $dest exists ($backendName)." );

        $this->assertEquals( filesize( $source ),
            $this->backend->getFileSize( array( 'src' => $dest ) ),
            "Destination file $dest has correct size ($backendName)." );

        $props1 = FSFile::getPropsFromPath( $source );
        $props2 = $this->backend->getFileProps( array( 'src' => $dest ) );
        $this->assertEquals( $props1, $props2,
            "Source and destination have the same props ($backendName)." );

        $this->assertBackendPathsConsistent( array( $dest ) );
    }

    public static function provider_testStore() {
        $cases = array();

        $tmpName = TempFSFile::factory( "unittests_", 'txt' )->getPath();
        $toPath = self::baseStorePath() . '/unittest-cont1/e/fun/obj1.txt';
        $op = array( 'op' => 'store', 'src' => $tmpName, 'dst' => $toPath );
        $cases[] = array(
            $op, // operation
            $tmpName, // source
            $toPath, // dest
        );

        $op2 = $op;
        $op2['overwrite'] = true;
        $cases[] = array(
            $op2, // operation
            $tmpName, // source
            $toPath, // dest
        );

        $op2 = $op;
        $op2['overwriteSame'] = true;
        $cases[] = array(
            $op2, // operation
            $tmpName, // source
            $toPath, // dest
        );

        return $cases;
    }

    public function testCopy( $op ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestCopy( $op );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestCopy( $op );
        $this->tearDownFiles();
    }

    private function doTestCopy( $op ) {
        $backendName = $this->backendClass();

        $source = $op['src'];
        $dest = $op['dst'];
        $this->prepare( array( 'dir' => dirname( $source ) ) );
        $this->prepare( array( 'dir' => dirname( $dest ) ) );

        if ( isset( $op['ignoreMissingSource'] ) ) {
            $status = $this->backend->doOperation( $op );
            $this->assertGoodStatus( $status,
                "Move from $source to $dest succeeded without warnings ($backendName)." );
            $this->assertEquals( array( 0 => true ), $status->success,
                "Move from $source to $dest has proper 'success' field in Status ($backendName)." );
            $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $source ) ),
                "Source file $source does not exist ($backendName)." );
            $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $dest ) ),
                "Destination file $dest does not exist ($backendName)." );

            return; // done
        }

        $status = $this->backend->doOperation(
            array( 'op' => 'create', 'content' => 'blahblah', 'dst' => $source ) );
        $this->assertGoodStatus( $status,
            "Creation of file at $source succeeded ($backendName)." );

        if ( isset( $op['overwrite'] ) || isset( $op['overwriteSame'] ) ) {
            $this->backend->copy( $op );
        }

        $status = $this->backend->doOperation( $op );

        $this->assertGoodStatus( $status,
            "Copy from $source to $dest succeeded without warnings ($backendName)." );
        $this->assertEquals( true, $status->isOK(),
            "Copy from $source to $dest succeeded ($backendName)." );
        $this->assertEquals( array( 0 => true ), $status->success,
            "Copy from $source to $dest has proper 'success' field in Status ($backendName)." );
        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $source ) ),
            "Source file $source still exists ($backendName)." );
        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $dest ) ),
            "Destination file $dest exists after copy ($backendName)." );

        $this->assertEquals(
            $this->backend->getFileSize( array( 'src' => $source ) ),
            $this->backend->getFileSize( array( 'src' => $dest ) ),
            "Destination file $dest has correct size ($backendName)." );

        $props1 = $this->backend->getFileProps( array( 'src' => $source ) );
        $props2 = $this->backend->getFileProps( array( 'src' => $dest ) );
        $this->assertEquals( $props1, $props2,
            "Source and destination have the same props ($backendName)." );

        $this->assertBackendPathsConsistent( array( $source, $dest ) );
    }

    public static function provider_testCopy() {
        $cases = array();

        $source = self::baseStorePath() . '/unittest-cont1/e/file.txt';
        $dest = self::baseStorePath() . '/unittest-cont2/a/fileMoved.txt';

        $op = array( 'op' => 'copy', 'src' => $source, 'dst' => $dest );
        $cases[] = array(
            $op, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['overwrite'] = true;
        $cases[] = array(
            $op2, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['overwriteSame'] = true;
        $cases[] = array(
            $op2, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['ignoreMissingSource'] = true;
        $cases[] = array(
            $op2, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['ignoreMissingSource'] = true;
        $cases[] = array(
            $op2, // operation
            self::baseStorePath() . '/unittest-cont-bad/e/file.txt', // source
            $dest, // dest
        );

        return $cases;
    }

    public function testMove( $op ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestMove( $op );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestMove( $op );
        $this->tearDownFiles();
    }

    private function doTestMove( $op ) {
        $backendName = $this->backendClass();

        $source = $op['src'];
        $dest = $op['dst'];
        $this->prepare( array( 'dir' => dirname( $source ) ) );
        $this->prepare( array( 'dir' => dirname( $dest ) ) );

        if ( isset( $op['ignoreMissingSource'] ) ) {
            $status = $this->backend->doOperation( $op );
            $this->assertGoodStatus( $status,
                "Move from $source to $dest succeeded without warnings ($backendName)." );
            $this->assertEquals( array( 0 => true ), $status->success,
                "Move from $source to $dest has proper 'success' field in Status ($backendName)." );
            $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $source ) ),
                "Source file $source does not exist ($backendName)." );
            $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $dest ) ),
                "Destination file $dest does not exist ($backendName)." );

            return; // done
        }

        $status = $this->backend->doOperation(
            array( 'op' => 'create', 'content' => 'blahblah', 'dst' => $source ) );
        $this->assertGoodStatus( $status,
            "Creation of file at $source succeeded ($backendName)." );

        if ( isset( $op['overwrite'] ) || isset( $op['overwriteSame'] ) ) {
            $this->backend->copy( $op );
        }

        $status = $this->backend->doOperation( $op );
        $this->assertGoodStatus( $status,
            "Move from $source to $dest succeeded without warnings ($backendName)." );
        $this->assertEquals( true, $status->isOK(),
            "Move from $source to $dest succeeded ($backendName)." );
        $this->assertEquals( array( 0 => true ), $status->success,
            "Move from $source to $dest has proper 'success' field in Status ($backendName)." );
        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $source ) ),
            "Source file $source does not still exists ($backendName)." );
        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $dest ) ),
            "Destination file $dest exists after move ($backendName)." );

        $this->assertNotEquals(
            $this->backend->getFileSize( array( 'src' => $source ) ),
            $this->backend->getFileSize( array( 'src' => $dest ) ),
            "Destination file $dest has correct size ($backendName)." );

        $props1 = $this->backend->getFileProps( array( 'src' => $source ) );
        $props2 = $this->backend->getFileProps( array( 'src' => $dest ) );
        $this->assertEquals( false, $props1['fileExists'],
            "Source file does not exist accourding to props ($backendName)." );
        $this->assertEquals( true, $props2['fileExists'],
            "Destination file exists accourding to props ($backendName)." );

        $this->assertBackendPathsConsistent( array( $source, $dest ) );
    }

    public static function provider_testMove() {
        $cases = array();

        $source = self::baseStorePath() . '/unittest-cont1/e/file.txt';
        $dest = self::baseStorePath() . '/unittest-cont2/a/fileMoved.txt';

        $op = array( 'op' => 'move', 'src' => $source, 'dst' => $dest );
        $cases[] = array(
            $op, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['overwrite'] = true;
        $cases[] = array(
            $op2, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['overwriteSame'] = true;
        $cases[] = array(
            $op2, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['ignoreMissingSource'] = true;
        $cases[] = array(
            $op2, // operation
            $source, // source
            $dest, // dest
        );

        $op2 = $op;
        $op2['ignoreMissingSource'] = true;
        $cases[] = array(
            $op2, // operation
            self::baseStorePath() . '/unittest-cont-bad/e/file.txt', // source
            $dest, // dest
        );

        return $cases;
    }

    public function testDelete( $op, $withSource, $okStatus ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestDelete( $op, $withSource, $okStatus );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestDelete( $op, $withSource, $okStatus );
        $this->tearDownFiles();
    }

    private function doTestDelete( $op, $withSource, $okStatus ) {
        $backendName = $this->backendClass();

        $source = $op['src'];
        $this->prepare( array( 'dir' => dirname( $source ) ) );

        if ( $withSource ) {
            $status = $this->backend->doOperation(
                array( 'op' => 'create', 'content' => 'blahblah', 'dst' => $source ) );
            $this->assertGoodStatus( $status,
                "Creation of file at $source succeeded ($backendName)." );
        }

        $status = $this->backend->doOperation( $op );
        if ( $okStatus ) {
            $this->assertGoodStatus( $status,
                "Deletion of file at $source succeeded without warnings ($backendName)." );
            $this->assertEquals( true, $status->isOK(),
                "Deletion of file at $source succeeded ($backendName)." );
            $this->assertEquals( array( 0 => true ), $status->success,
                "Deletion of file at $source has proper 'success' field in Status ($backendName)." );
        } else {
            $this->assertEquals( false, $status->isOK(),
                "Deletion of file at $source failed ($backendName)." );
        }

        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $source ) ),
            "Source file $source does not exist after move ($backendName)." );

        $this->assertFalse(
            $this->backend->getFileSize( array( 'src' => $source ) ),
            "Source file $source has correct size (false) ($backendName)." );

        $props1 = $this->backend->getFileProps( array( 'src' => $source ) );
        $this->assertFalse( $props1['fileExists'],
            "Source file $source does not exist according to props ($backendName)." );

        $this->assertBackendPathsConsistent( array( $source ) );
    }

    public static function provider_testDelete() {
        $cases = array();

        $source = self::baseStorePath() . '/unittest-cont1/e/myfacefile.txt';

        $op = array( 'op' => 'delete', 'src' => $source );
        $cases[] = array(
            $op, // operation
            true, // with source
            true // succeeds
        );

        $cases[] = array(
            $op, // operation
            false, // without source
            false // fails
        );

        $op['ignoreMissingSource'] = true;
        $cases[] = array(
            $op, // operation
            false, // without source
            true // succeeds
        );

        $op['ignoreMissingSource'] = true;
        $op['src'] = self::baseStorePath() . '/unittest-cont-bad/e/file.txt';
        $cases[] = array(
            $op, // operation
            false, // without source
            true // succeeds
        );

        return $cases;
    }

    public function testDescribe( $op, $withSource, $okStatus ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestDescribe( $op, $withSource, $okStatus );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestDescribe( $op, $withSource, $okStatus );
        $this->tearDownFiles();
    }

    private function doTestDescribe( $op, $withSource, $okStatus ) {
        $backendName = $this->backendClass();

        $source = $op['src'];
        $this->prepare( array( 'dir' => dirname( $source ) ) );

        if ( $withSource ) {
            $status = $this->backend->doOperation(
                array( 'op' => 'create', 'content' => 'blahblah', 'dst' => $source ) );
            $this->assertGoodStatus( $status,
                "Creation of file at $source succeeded ($backendName)." );
        }

        $status = $this->backend->doOperation( $op );
        if ( $okStatus ) {
            $this->assertGoodStatus( $status,
                "Describe of file at $source succeeded without warnings ($backendName)." );
            $this->assertEquals( true, $status->isOK(),
                "Describe of file at $source succeeded ($backendName)." );
            $this->assertEquals( array( 0 => true ), $status->success,
                "Describe of file at $source has proper 'success' field in Status ($backendName)." );
        } else {
            $this->assertEquals( false, $status->isOK(),
                "Describe of file at $source failed ($backendName)." );
        }

        $this->assertBackendPathsConsistent( array( $source ) );
    }

    public static function provider_testDescribe() {
        $cases = array();

        $source = self::baseStorePath() . '/unittest-cont1/e/myfacefile.txt';

        $op = array( 'op' => 'describe', 'src' => $source,
            'headers' => array( 'X-Content-Length' => '91.3', 'Content-Old-Header' => '' ),
            'disposition' => 'inline' );
        $cases[] = array(
            $op, // operation
            true, // with source
            true // succeeds
        );

        $cases[] = array(
            $op, // operation
            false, // without source
            false // fails
        );

        return $cases;
    }

    public function testCreate( $op, $alreadyExists, $okStatus, $newSize ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestCreate( $op, $alreadyExists, $okStatus, $newSize );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestCreate( $op, $alreadyExists, $okStatus, $newSize );
        $this->tearDownFiles();
    }

    private function doTestCreate( $op, $alreadyExists, $okStatus, $newSize ) {
        $backendName = $this->backendClass();

        $dest = $op['dst'];
        $this->prepare( array( 'dir' => dirname( $dest ) ) );

        $oldText = 'blah...blah...waahwaah';
        if ( $alreadyExists ) {
            $status = $this->backend->doOperation(
                array( 'op' => 'create', 'content' => $oldText, 'dst' => $dest ) );
            $this->assertGoodStatus( $status,
                "Creation of file at $dest succeeded ($backendName)." );
        }

        $status = $this->backend->doOperation( $op );
        if ( $okStatus ) {
            $this->assertGoodStatus( $status,
                "Creation of file at $dest succeeded without warnings ($backendName)." );
            $this->assertEquals( true, $status->isOK(),
                "Creation of file at $dest succeeded ($backendName)." );
            $this->assertEquals( array( 0 => true ), $status->success,
                "Creation of file at $dest has proper 'success' field in Status ($backendName)." );
        } else {
            $this->assertEquals( false, $status->isOK(),
                "Creation of file at $dest failed ($backendName)." );
        }

        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $dest ) ),
            "Destination file $dest exists after creation ($backendName)." );

        $props1 = $this->backend->getFileProps( array( 'src' => $dest ) );
        $this->assertEquals( true, $props1['fileExists'],
            "Destination file $dest exists according to props ($backendName)." );
        if ( $okStatus ) { // file content is what we saved
            $this->assertEquals( $newSize, $props1['size'],
                "Destination file $dest has expected size according to props ($backendName)." );
            $this->assertEquals( $newSize,
                $this->backend->getFileSize( array( 'src' => $dest ) ),
                "Destination file $dest has correct size ($backendName)." );
        } else { // file content is some other previous text
            $this->assertEquals( strlen( $oldText ), $props1['size'],
                "Destination file $dest has original size according to props ($backendName)." );
            $this->assertEquals( strlen( $oldText ),
                $this->backend->getFileSize( array( 'src' => $dest ) ),
                "Destination file $dest has original size according to props ($backendName)." );
        }

        $this->assertBackendPathsConsistent( array( $dest ) );
    }

    public static function provider_testCreate() {
        $cases = array();

        $dest = self::baseStorePath() . '/unittest-cont2/a/myspacefile.txt';

        $op = array( 'op' => 'create', 'content' => 'test test testing', 'dst' => $dest );
        $cases[] = array(
            $op, // operation
            false, // no dest already exists
            true, // succeeds
            strlen( $op['content'] )
        );

        $op2 = $op;
        $op2['content'] = "\n";
        $cases[] = array(
            $op2, // operation
            false, // no dest already exists
            true, // succeeds
            strlen( $op2['content'] )
        );

        $op2 = $op;
        $op2['content'] = "fsf\n waf 3kt";
        $cases[] = array(
            $op2, // operation
            true, // dest already exists
            false, // fails
            strlen( $op2['content'] )
        );

        $op2 = $op;
        $op2['content'] = "egm'g gkpe gpqg eqwgwqg";
        $op2['overwrite'] = true;
        $cases[] = array(
            $op2, // operation
            true, // dest already exists
            true, // succeeds
            strlen( $op2['content'] )
        );

        $op2 = $op;
        $op2['content'] = "39qjmg3-qg";
        $op2['overwriteSame'] = true;
        $cases[] = array(
            $op2, // operation
            true, // dest already exists
            false, // succeeds
            strlen( $op2['content'] )
        );

        return $cases;
    }

    public function testDoQuickOperations() {
        $this->backend = $this->singleBackend;
        $this->doTestDoQuickOperations();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->doTestDoQuickOperations();
        $this->tearDownFiles();
    }

    private function doTestDoQuickOperations() {
        $backendName = $this->backendClass();

        $base = self::baseStorePath();
        $files = array(
            "$base/unittest-cont1/e/fileA.a",
            "$base/unittest-cont1/e/fileB.a",
            "$base/unittest-cont1/e/fileC.a"
        );
        $createOps = array();
        $purgeOps = array();
        foreach ( $files as $path ) {
            $status = $this->prepare( array( 'dir' => dirname( $path ) ) );
            $this->assertGoodStatus( $status,
                "Preparing $path succeeded without warnings ($backendName)." );
            $createOps[] = array( 'op' => 'create', 'dst' => $path, 'content' => mt_rand( 0, 50000 ) );
            $copyOps[] = array( 'op' => 'copy', 'src' => $path, 'dst' => "$path-2" );
            $moveOps[] = array( 'op' => 'move', 'src' => "$path-2", 'dst' => "$path-3" );
            $purgeOps[] = array( 'op' => 'delete', 'src' => $path );
            $purgeOps[] = array( 'op' => 'delete', 'src' => "$path-3" );
        }
        $purgeOps[] = array( 'op' => 'null' );

        $this->assertGoodStatus(
            $this->backend->doQuickOperations( $createOps ),
            "Creation of source files succeeded ($backendName)." );
        foreach ( $files as $file ) {
            $this->assertTrue( $this->backend->fileExists( array( 'src' => $file ) ),
                "File $file exists." );
        }

        $this->assertGoodStatus(
            $this->backend->doQuickOperations( $copyOps ),
            "Quick copy of source files succeeded ($backendName)." );
        foreach ( $files as $file ) {
            $this->assertTrue( $this->backend->fileExists( array( 'src' => "$file-2" ) ),
                "File $file-2 exists." );
        }

        $this->assertGoodStatus(
            $this->backend->doQuickOperations( $moveOps ),
            "Quick move of source files succeeded ($backendName)." );
        foreach ( $files as $file ) {
            $this->assertTrue( $this->backend->fileExists( array( 'src' => "$file-3" ) ),
                "File $file-3 move in." );
            $this->assertFalse( $this->backend->fileExists( array( 'src' => "$file-2" ) ),
                "File $file-2 moved away." );
        }

        $this->assertGoodStatus(
            $this->backend->quickCopy( array( 'src' => $files[0], 'dst' => $files[0] ) ),
            "Copy of file {$files[0]} over itself succeeded ($backendName)." );
        $this->assertTrue( $this->backend->fileExists( array( 'src' => $files[0] ) ),
            "File {$files[0]} still exists." );

        $this->assertGoodStatus(
            $this->backend->quickMove( array( 'src' => $files[0], 'dst' => $files[0] ) ),
            "Move of file {$files[0]} over itself succeeded ($backendName)." );
        $this->assertTrue( $this->backend->fileExists( array( 'src' => $files[0] ) ),
            "File {$files[0]} still exists." );

        $this->assertGoodStatus(
            $this->backend->doQuickOperations( $purgeOps ),
            "Quick deletion of source files succeeded ($backendName)." );
        foreach ( $files as $file ) {
            $this->assertFalse( $this->backend->fileExists( array( 'src' => $file ) ),
                "File $file purged." );
            $this->assertFalse( $this->backend->fileExists( array( 'src' => "$file-3" ) ),
                "File $file-3 purged." );
        }
    }

    public function testConcatenate( $op, $srcs, $srcsContent, $alreadyExists, $okStatus ) {
        $this->filesToPrune[] = $op['dst'];

        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestConcatenate( $op, $srcs, $srcsContent, $alreadyExists, $okStatus );
        $this->filesToPrune[] = $op['dst']; # avoid file leaking
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestConcatenate( $op, $srcs, $srcsContent, $alreadyExists, $okStatus );
        $this->filesToPrune[] = $op['dst']; # avoid file leaking
        $this->tearDownFiles();
    }

    private function doTestConcatenate( $params, $srcs, $srcsContent, $alreadyExists, $okStatus ) {
        $backendName = $this->backendClass();

        $expContent = '';
        // Create sources
        $ops = array();
        foreach ( $srcs as $i => $source ) {
            $this->prepare( array( 'dir' => dirname( $source ) ) );
            $ops[] = array(
                'op' => 'create', // operation
                'dst' => $source, // source
                'content' => $srcsContent[$i]
            );
            $expContent .= $srcsContent[$i];
        }
        $status = $this->backend->doOperations( $ops );

        $this->assertGoodStatus( $status,
            "Creation of source files succeeded ($backendName)." );

        $dest = $params['dst'];
        if ( $alreadyExists ) {
            $ok = file_put_contents( $dest, 'blah...blah...waahwaah' ) !== false;
            $this->assertEquals( true, $ok,
                "Creation of file at $dest succeeded ($backendName)." );
        } else {
            $ok = file_put_contents( $dest, '' ) !== false;
            $this->assertEquals( true, $ok,
                "Creation of 0-byte file at $dest succeeded ($backendName)." );
        }

        // Combine the files into one
        $status = $this->backend->concatenate( $params );
        if ( $okStatus ) {
            $this->assertGoodStatus( $status,
                "Creation of concat file at $dest succeeded without warnings ($backendName)." );
            $this->assertEquals( true, $status->isOK(),
                "Creation of concat file at $dest succeeded ($backendName)." );
        } else {
            $this->assertEquals( false, $status->isOK(),
                "Creation of concat file at $dest failed ($backendName)." );
        }

        if ( $okStatus ) {
            $this->assertEquals( true, is_file( $dest ),
                "Dest concat file $dest exists after creation ($backendName)." );
        } else {
            $this->assertEquals( true, is_file( $dest ),
                "Dest concat file $dest exists after failed creation ($backendName)." );
        }

        $contents = file_get_contents( $dest );
        $this->assertNotEquals( false, $contents, "File at $dest exists ($backendName)." );

        if ( $okStatus ) {
            $this->assertEquals( $expContent, $contents,
                "Concat file at $dest has correct contents ($backendName)." );
        } else {
            $this->assertNotEquals( $expContent, $contents,
                "Concat file at $dest has correct contents ($backendName)." );
        }
    }

    public static function provider_testConcatenate() {
        $cases = array();

        $rand = mt_rand( 0, 2000000000 ) . time();
        $dest = wfTempDir() . "/randomfile!$rand.txt";
        $srcs = array(
            self::baseStorePath() . '/unittest-cont1/e/file1.txt',
            self::baseStorePath() . '/unittest-cont1/e/file2.txt',
            self::baseStorePath() . '/unittest-cont1/e/file3.txt',
            self::baseStorePath() . '/unittest-cont1/e/file4.txt',
            self::baseStorePath() . '/unittest-cont1/e/file5.txt',
            self::baseStorePath() . '/unittest-cont1/e/file6.txt',
            self::baseStorePath() . '/unittest-cont1/e/file7.txt',
            self::baseStorePath() . '/unittest-cont1/e/file8.txt',
            self::baseStorePath() . '/unittest-cont1/e/file9.txt',
            self::baseStorePath() . '/unittest-cont1/e/file10.txt'
        );
        $content = array(
            'egfage',
            'ageageag',
            'rhokohlr',
            'shgmslkg',
            'kenga',
            'owagmal',
            'kgmae',
            'g eak;g',
            'lkaem;a',
            'legma'
        );
        $params = array( 'srcs' => $srcs, 'dst' => $dest );

        $cases[] = array(
            $params, // operation
            $srcs, // sources
            $content, // content for each source
            false, // no dest already exists
            true, // succeeds
        );

        $cases[] = array(
            $params, // operation
            $srcs, // sources
            $content, // content for each source
            true, // dest already exists
            false, // succeeds
        );

        return $cases;
    }

    public function testGetFileStat( $path, $content, $alreadyExists ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetFileStat( $path, $content, $alreadyExists );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetFileStat( $path, $content, $alreadyExists );
        $this->tearDownFiles();
    }

    private function doTestGetFileStat( $path, $content, $alreadyExists ) {
        $backendName = $this->backendClass();

        if ( $alreadyExists ) {
            $this->prepare( array( 'dir' => dirname( $path ) ) );
            $status = $this->create( array( 'dst' => $path, 'content' => $content ) );
            $this->assertGoodStatus( $status,
                "Creation of file at $path succeeded ($backendName)." );

            $size = $this->backend->getFileSize( array( 'src' => $path ) );
            $time = $this->backend->getFileTimestamp( array( 'src' => $path ) );
            $stat = $this->backend->getFileStat( array( 'src' => $path ) );

            $this->assertEquals( strlen( $content ), $size,
                "Correct file size of '$path'" );
            $this->assertTrue( abs( time() - wfTimestamp( TS_UNIX, $time ) ) < 10,
                "Correct file timestamp of '$path'" );

            $size = $stat['size'];
            $time = $stat['mtime'];
            $this->assertEquals( strlen( $content ), $size,
                "Correct file size of '$path'" );
            $this->assertTrue( abs( time() - wfTimestamp( TS_UNIX, $time ) ) < 10,
                "Correct file timestamp of '$path'" );

            $this->backend->clearCache( array( $path ) );

            $size = $this->backend->getFileSize( array( 'src' => $path ) );

            $this->assertEquals( strlen( $content ), $size,
                "Correct file size of '$path'" );

            $this->backend->preloadCache( array( $path ) );

            $size = $this->backend->getFileSize( array( 'src' => $path ) );

            $this->assertEquals( strlen( $content ), $size,
                "Correct file size of '$path'" );
        } else {
            $size = $this->backend->getFileSize( array( 'src' => $path ) );
            $time = $this->backend->getFileTimestamp( array( 'src' => $path ) );
            $stat = $this->backend->getFileStat( array( 'src' => $path ) );

            $this->assertFalse( $size, "Correct file size of '$path'" );
            $this->assertFalse( $time, "Correct file timestamp of '$path'" );
            $this->assertFalse( $stat, "Correct file stat of '$path'" );
        }
    }

    public static function provider_testGetFileStat() {
        $cases = array();

        $base = self::baseStorePath();
        $cases[] = array( "$base/unittest-cont1/e/b/z/some_file.txt", "some file contents", true );
        $cases[] = array( "$base/unittest-cont1/e/b/some-other_file.txt", "", true );
        $cases[] = array( "$base/unittest-cont1/e/b/some-diff_file.txt", null, false );

        return $cases;
    }

    public function testGetFileContents( $source, $content ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetFileContents( $source, $content );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetFileContents( $source, $content );
        $this->tearDownFiles();
    }

    private function doTestGetFileContents( $source, $content ) {
        $backendName = $this->backendClass();

        $srcs = (array)$source;
        $content = (array)$content;
        foreach ( $srcs as $i => $src ) {
            $this->prepare( array( 'dir' => dirname( $src ) ) );
            $status = $this->backend->doOperation(
                array( 'op' => 'create', 'content' => $content[$i], 'dst' => $src ) );
            $this->assertGoodStatus( $status,
                "Creation of file at $src succeeded ($backendName)." );
        }

        if ( is_array( $source ) ) {
            $contents = $this->backend->getFileContentsMulti( array( 'srcs' => $source ) );
            foreach ( $contents as $path => $data ) {
                $this->assertNotEquals( false, $data, "Contents of $path exists ($backendName)." );
                $this->assertEquals( current( $content ), $data, "Contents of $path is correct ($backendName)." );
                next( $content );
            }
            $this->assertEquals( $source, array_keys( $contents ), "Contents in right order ($backendName)." );
            $this->assertEquals( count( $source ), count( $contents ), "Contents array size correct ($backendName)." );
        } else {
            $data = $this->backend->getFileContents( array( 'src' => $source ) );
            $this->assertNotEquals( false, $data, "Contents of $source exists ($backendName)." );
            $this->assertEquals( $content[0], $data, "Contents of $source is correct ($backendName)." );
        }
    }

    public static function provider_testGetFileContents() {
        $cases = array();

        $base = self::baseStorePath();
        $cases[] = array( "$base/unittest-cont1/e/b/z/some_file.txt", "some file contents" );
        $cases[] = array( "$base/unittest-cont1/e/b/some-other_file.txt", "more file contents" );
        $cases[] = array(
            array( "$base/unittest-cont1/e/a/x.txt", "$base/unittest-cont1/e/a/y.txt",
                "$base/unittest-cont1/e/a/z.txt" ),
            array( "contents xx", "contents xy", "contents xz" )
        );

        return $cases;
    }

    public function testGetLocalCopy( $source, $content ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetLocalCopy( $source, $content );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetLocalCopy( $source, $content );
        $this->tearDownFiles();
    }

    private function doTestGetLocalCopy( $source, $content ) {
        $backendName = $this->backendClass();

        $srcs = (array)$source;
        $content = (array)$content;
        foreach ( $srcs as $i => $src ) {
            $this->prepare( array( 'dir' => dirname( $src ) ) );
            $status = $this->backend->doOperation(
                array( 'op' => 'create', 'content' => $content[$i], 'dst' => $src ) );
            $this->assertGoodStatus( $status,
                "Creation of file at $src succeeded ($backendName)." );
        }

        if ( is_array( $source ) ) {
            $tmpFiles = $this->backend->getLocalCopyMulti( array( 'srcs' => $source ) );
            foreach ( $tmpFiles as $path => $tmpFile ) {
                $this->assertNotNull( $tmpFile,
                    "Creation of local copy of $path succeeded ($backendName)." );
                $contents = file_get_contents( $tmpFile->getPath() );
                $this->assertNotEquals( false, $contents, "Local copy of $path exists ($backendName)." );
                $this->assertEquals( current( $content ), $contents, "Local copy of $path is correct ($backendName)." );
                next( $content );
            }
            $this->assertEquals( $source, array_keys( $tmpFiles ), "Local copies in right order ($backendName)." );
            $this->assertEquals( count( $source ), count( $tmpFiles ), "Local copies array size correct ($backendName)." );
        } else {
            $tmpFile = $this->backend->getLocalCopy( array( 'src' => $source ) );
            $this->assertNotNull( $tmpFile,
                "Creation of local copy of $source succeeded ($backendName)." );
            $contents = file_get_contents( $tmpFile->getPath() );
            $this->assertNotEquals( false, $contents, "Local copy of $source exists ($backendName)." );
            $this->assertEquals( $content[0], $contents, "Local copy of $source is correct ($backendName)." );
        }

        $obj = new stdClass();
        $tmpFile->bind( $obj );
    }

    public static function provider_testGetLocalCopy() {
        $cases = array();

        $base = self::baseStorePath();
        $cases[] = array( "$base/unittest-cont1/e/a/z/some_file.txt", "some file contents" );
        $cases[] = array( "$base/unittest-cont1/e/a/some-other_file.txt", "more file contents" );
        $cases[] = array( "$base/unittest-cont1/e/a/\$odd&.txt", "test file contents" );
        $cases[] = array(
            array( "$base/unittest-cont1/e/a/x.txt", "$base/unittest-cont1/e/a/y.txt",
                "$base/unittest-cont1/e/a/z.txt" ),
            array( "contents xx", "contents xy", "contents xz" )
        );

        return $cases;
    }

    public function testGetLocalReference( $source, $content ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetLocalReference( $source, $content );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetLocalReference( $source, $content );
        $this->tearDownFiles();
    }

    private function doTestGetLocalReference( $source, $content ) {
        $backendName = $this->backendClass();

        $srcs = (array)$source;
        $content = (array)$content;
        foreach ( $srcs as $i => $src ) {
            $this->prepare( array( 'dir' => dirname( $src ) ) );
            $status = $this->backend->doOperation(
                array( 'op' => 'create', 'content' => $content[$i], 'dst' => $src ) );
            $this->assertGoodStatus( $status,
                "Creation of file at $src succeeded ($backendName)." );
        }

        if ( is_array( $source ) ) {
            $tmpFiles = $this->backend->getLocalReferenceMulti( array( 'srcs' => $source ) );
            foreach ( $tmpFiles as $path => $tmpFile ) {
                $this->assertNotNull( $tmpFile,
                    "Creation of local copy of $path succeeded ($backendName)." );
                $contents = file_get_contents( $tmpFile->getPath() );
                $this->assertNotEquals( false, $contents, "Local ref of $path exists ($backendName)." );
                $this->assertEquals( current( $content ), $contents, "Local ref of $path is correct ($backendName)." );
                next( $content );
            }
            $this->assertEquals( $source, array_keys( $tmpFiles ), "Local refs in right order ($backendName)." );
            $this->assertEquals( count( $source ), count( $tmpFiles ), "Local refs array size correct ($backendName)." );
        } else {
            $tmpFile = $this->backend->getLocalReference( array( 'src' => $source ) );
            $this->assertNotNull( $tmpFile,
                "Creation of local copy of $source succeeded ($backendName)." );
            $contents = file_get_contents( $tmpFile->getPath() );
            $this->assertNotEquals( false, $contents, "Local ref of $source exists ($backendName)." );
            $this->assertEquals( $content[0], $contents, "Local ref of $source is correct ($backendName)." );
        }
    }

    public static function provider_testGetLocalReference() {
        $cases = array();

        $base = self::baseStorePath();
        $cases[] = array( "$base/unittest-cont1/e/a/z/some_file.txt", "some file contents" );
        $cases[] = array( "$base/unittest-cont1/e/a/some-other_file.txt", "more file contents" );
        $cases[] = array( "$base/unittest-cont1/e/a/\$odd&.txt", "test file contents" );
        $cases[] = array(
            array( "$base/unittest-cont1/e/a/x.txt", "$base/unittest-cont1/e/a/y.txt",
                "$base/unittest-cont1/e/a/z.txt" ),
            array( "contents xx", "contents xy", "contents xz" )
        );

        return $cases;
    }

    public function testGetLocalCopyAndReference404() {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetLocalCopyAndReference404();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetLocalCopyAndReference404();
        $this->tearDownFiles();
    }

    public function doTestGetLocalCopyAndReference404() {
        $backendName = $this->backendClass();

        $base = self::baseStorePath();

        $tmpFile = $this->backend->getLocalCopy( array(
            'src' => "$base/unittest-cont1/not-there" ) );
        $this->assertEquals( null, $tmpFile, "Local copy of not existing file is null ($backendName)." );

        $tmpFile = $this->backend->getLocalReference( array(
            'src' => "$base/unittest-cont1/not-there" ) );
        $this->assertEquals( null, $tmpFile, "Local ref of not existing file is null ($backendName)." );
    }

    public function testGetFileHttpUrl( $source, $content ) {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetFileHttpUrl( $source, $content );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetFileHttpUrl( $source, $content );
        $this->tearDownFiles();
    }

    private function doTestGetFileHttpUrl( $source, $content ) {
        $backendName = $this->backendClass();

        $this->prepare( array( 'dir' => dirname( $source ) ) );
        $status = $this->backend->doOperation(
            array( 'op' => 'create', 'content' => $content, 'dst' => $source ) );
        $this->assertGoodStatus( $status,
            "Creation of file at $source succeeded ($backendName)." );

        $url = $this->backend->getFileHttpUrl( array( 'src' => $source ) );

        if ( $url !== null ) { // supported
            $data = Http::request( "GET", $url );
            $this->assertEquals( $content, $data,
                "HTTP GET of URL has right contents ($backendName)." );
        }
    }

    public static function provider_testGetFileHttpUrl() {
        $cases = array();

        $base = self::baseStorePath();
        $cases[] = array( "$base/unittest-cont1/e/a/z/some_file.txt", "some file contents" );
        $cases[] = array( "$base/unittest-cont1/e/a/some-other_file.txt", "more file contents" );
        $cases[] = array( "$base/unittest-cont1/e/a/\$odd&.txt", "test file contents" );

        return $cases;
    }

    public function testPrepareAndClean( $path, $isOK ) {
        $this->backend = $this->singleBackend;
        $this->doTestPrepareAndClean( $path, $isOK );
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->doTestPrepareAndClean( $path, $isOK );
        $this->tearDownFiles();
    }

    public static function provider_testPrepareAndClean() {
        $base = self::baseStorePath();

        return array(
            array( "$base/unittest-cont1/e/a/z/some_file1.txt", true ),
            array( "$base/unittest-cont2/a/z/some_file2.txt", true ),
            # Specific to FS backend with no basePath field set
            #array( "$base/unittest-cont3/a/z/some_file3.txt", false ),
        );
    }

    private function doTestPrepareAndClean( $path, $isOK ) {
        $backendName = $this->backendClass();

        $status = $this->prepare( array( 'dir' => dirname( $path ) ) );
        if ( $isOK ) {
            $this->assertGoodStatus( $status,
                "Preparing dir $path succeeded without warnings ($backendName)." );
            $this->assertEquals( true, $status->isOK(),
                "Preparing dir $path succeeded ($backendName)." );
        } else {
            $this->assertEquals( false, $status->isOK(),
                "Preparing dir $path failed ($backendName)." );
        }

        $status = $this->backend->clean( array( 'dir' => dirname( $path ) ) );
        if ( $isOK ) {
            $this->assertGoodStatus( $status,
                "Cleaning dir $path succeeded without warnings ($backendName)." );
            $this->assertEquals( true, $status->isOK(),
                "Cleaning dir $path succeeded ($backendName)." );
        } else {
            $this->assertEquals( false, $status->isOK(),
                "Cleaning dir $path failed ($backendName)." );
        }
    }

    public function testRecursiveClean() {
        $this->backend = $this->singleBackend;
        $this->doTestRecursiveClean();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->doTestRecursiveClean();
        $this->tearDownFiles();
    }

    private function doTestRecursiveClean() {
        $backendName = $this->backendClass();

        $base = self::baseStorePath();
        $dirs = array(
            "$base/unittest-cont1",
            "$base/unittest-cont1/e",
            "$base/unittest-cont1/e/a",
            "$base/unittest-cont1/e/a/b",
            "$base/unittest-cont1/e/a/b/c",
            "$base/unittest-cont1/e/a/b/c/d0",
            "$base/unittest-cont1/e/a/b/c/d1",
            "$base/unittest-cont1/e/a/b/c/d2",
            "$base/unittest-cont1/e/a/b/c/d0/1",
            "$base/unittest-cont1/e/a/b/c/d0/2",
            "$base/unittest-cont1/e/a/b/c/d1/3",
            "$base/unittest-cont1/e/a/b/c/d1/4",
            "$base/unittest-cont1/e/a/b/c/d2/5",
            "$base/unittest-cont1/e/a/b/c/d2/6"
        );
        foreach ( $dirs as $dir ) {
            $status = $this->prepare( array( 'dir' => $dir ) );
            $this->assertGoodStatus( $status,
                "Preparing dir $dir succeeded without warnings ($backendName)." );
        }

        if ( $this->backend instanceof FSFileBackend ) {
            foreach ( $dirs as $dir ) {
                $this->assertEquals( true, $this->backend->directoryExists( array( 'dir' => $dir ) ),
                    "Dir $dir exists ($backendName)." );
            }
        }

        $status = $this->backend->clean(
            array( 'dir' => "$base/unittest-cont1", 'recursive' => 1 ) );
        $this->assertGoodStatus( $status,
            "Recursive cleaning of dir $dir succeeded without warnings ($backendName)." );

        foreach ( $dirs as $dir ) {
            $this->assertEquals( false, $this->backend->directoryExists( array( 'dir' => $dir ) ),
                "Dir $dir no longer exists ($backendName)." );
        }
    }

    // @todo testSecure

    public function testDoOperations() {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestDoOperations();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestDoOperations();
        $this->tearDownFiles();
    }

    private function doTestDoOperations() {
        $base = self::baseStorePath();

        $fileA = "$base/unittest-cont1/e/a/b/fileA.txt";
        $fileAContents = '3tqtmoeatmn4wg4qe-mg3qt3 tq';
        $fileB = "$base/unittest-cont1/e/a/b/fileB.txt";
        $fileBContents = 'g-jmq3gpqgt3qtg q3GT ';
        $fileC = "$base/unittest-cont1/e/a/b/fileC.txt";
        $fileCContents = 'eigna[ogmewt 3qt g3qg flew[ag';
        $fileD = "$base/unittest-cont1/e/a/b/fileD.txt";

        $this->prepare( array( 'dir' => dirname( $fileA ) ) );
        $this->create( array( 'dst' => $fileA, 'content' => $fileAContents ) );
        $this->prepare( array( 'dir' => dirname( $fileB ) ) );
        $this->create( array( 'dst' => $fileB, 'content' => $fileBContents ) );
        $this->prepare( array( 'dir' => dirname( $fileC ) ) );
        $this->create( array( 'dst' => $fileC, 'content' => $fileCContents ) );
        $this->prepare( array( 'dir' => dirname( $fileD ) ) );

        $status = $this->backend->doOperations( array(
            array( 'op' => 'describe', 'src' => $fileA,
                'headers' => array( 'X-Content-Length' => '91.3' ), 'disposition' => 'inline' ),
            array( 'op' => 'copy', 'src' => $fileA, 'dst' => $fileC, 'overwrite' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty> (file:<orginal contents>)
            array( 'op' => 'copy', 'src' => $fileC, 'dst' => $fileA, 'overwriteSame' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty>
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileD, 'overwrite' => 1 ),
            // Now: A:<A>, B:<B>, C:<empty>, D:<A>
            array( 'op' => 'move', 'src' => $fileB, 'dst' => $fileC ),
            // Now: A:<A>, B:<empty>, C:<B>, D:<A>
            array( 'op' => 'move', 'src' => $fileD, 'dst' => $fileA, 'overwriteSame' => 1 ),
            // Now: A:<A>, B:<empty>, C:<B>, D:<empty>
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileA, 'overwrite' => 1 ),
            // Now: A:<B>, B:<empty>, C:<empty>, D:<empty>
            array( 'op' => 'copy', 'src' => $fileA, 'dst' => $fileC ),
            // Now: A:<B>, B:<empty>, C:<B>, D:<empty>
            array( 'op' => 'move', 'src' => $fileA, 'dst' => $fileC, 'overwriteSame' => 1 ),
            // Now: A:<empty>, B:<empty>, C:<B>, D:<empty>
            array( 'op' => 'copy', 'src' => $fileC, 'dst' => $fileC, 'overwrite' => 1 ),
            // Does nothing
            array( 'op' => 'copy', 'src' => $fileC, 'dst' => $fileC, 'overwriteSame' => 1 ),
            // Does nothing
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileC, 'overwrite' => 1 ),
            // Does nothing
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileC, 'overwriteSame' => 1 ),
            // Does nothing
            array( 'op' => 'null' ),
            // Does nothing
        ) );

        $this->assertGoodStatus( $status, "Operation batch succeeded" );
        $this->assertEquals( true, $status->isOK(), "Operation batch succeeded" );
        $this->assertEquals( 14, count( $status->success ),
            "Operation batch has correct success array" );

        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileA ) ),
            "File does not exist at $fileA" );
        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileB ) ),
            "File does not exist at $fileB" );
        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileD ) ),
            "File does not exist at $fileD" );

        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $fileC ) ),
            "File exists at $fileC" );
        $this->assertEquals( $fileBContents,
            $this->backend->getFileContents( array( 'src' => $fileC ) ),
            "Correct file contents of $fileC" );
        $this->assertEquals( strlen( $fileBContents ),
            $this->backend->getFileSize( array( 'src' => $fileC ) ),
            "Correct file size of $fileC" );
        $this->assertEquals( wfBaseConvert( sha1( $fileBContents ), 16, 36, 31 ),
            $this->backend->getFileSha1Base36( array( 'src' => $fileC ) ),
            "Correct file SHA-1 of $fileC" );
    }

    public function testDoOperationsPipeline() {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestDoOperationsPipeline();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestDoOperationsPipeline();
        $this->tearDownFiles();
    }

    // concurrency orientated
    private function doTestDoOperationsPipeline() {
        $base = self::baseStorePath();

        $fileAContents = '3tqtmoeatmn4wg4qe-mg3qt3 tq';
        $fileBContents = 'g-jmq3gpqgt3qtg q3GT ';
        $fileCContents = 'eigna[ogmewt 3qt g3qg flew[ag';

        $tmpNameA = TempFSFile::factory( "unittests_", 'txt' )->getPath();
        file_put_contents( $tmpNameA, $fileAContents );
        $tmpNameB = TempFSFile::factory( "unittests_", 'txt' )->getPath();
        file_put_contents( $tmpNameB, $fileBContents );
        $tmpNameC = TempFSFile::factory( "unittests_", 'txt' )->getPath();
        file_put_contents( $tmpNameC, $fileCContents );

        $this->filesToPrune[] = $tmpNameA; # avoid file leaking
        $this->filesToPrune[] = $tmpNameB; # avoid file leaking
        $this->filesToPrune[] = $tmpNameC; # avoid file leaking

        $fileA = "$base/unittest-cont1/e/a/b/fileA.txt";
        $fileB = "$base/unittest-cont1/e/a/b/fileB.txt";
        $fileC = "$base/unittest-cont1/e/a/b/fileC.txt";
        $fileD = "$base/unittest-cont1/e/a/b/fileD.txt";

        $this->prepare( array( 'dir' => dirname( $fileA ) ) );
        $this->create( array( 'dst' => $fileA, 'content' => $fileAContents ) );
        $this->prepare( array( 'dir' => dirname( $fileB ) ) );
        $this->prepare( array( 'dir' => dirname( $fileC ) ) );
        $this->prepare( array( 'dir' => dirname( $fileD ) ) );

        $status = $this->backend->doOperations( array(
            array( 'op' => 'store', 'src' => $tmpNameA, 'dst' => $fileA, 'overwriteSame' => 1 ),
            array( 'op' => 'store', 'src' => $tmpNameB, 'dst' => $fileB, 'overwrite' => 1 ),
            array( 'op' => 'store', 'src' => $tmpNameC, 'dst' => $fileC, 'overwrite' => 1 ),
            array( 'op' => 'copy', 'src' => $fileA, 'dst' => $fileC, 'overwrite' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty> (file:<orginal contents>)
            array( 'op' => 'copy', 'src' => $fileC, 'dst' => $fileA, 'overwriteSame' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty>
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileD, 'overwrite' => 1 ),
            // Now: A:<A>, B:<B>, C:<empty>, D:<A>
            array( 'op' => 'move', 'src' => $fileB, 'dst' => $fileC ),
            // Now: A:<A>, B:<empty>, C:<B>, D:<A>
            array( 'op' => 'move', 'src' => $fileD, 'dst' => $fileA, 'overwriteSame' => 1 ),
            // Now: A:<A>, B:<empty>, C:<B>, D:<empty>
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileA, 'overwrite' => 1 ),
            // Now: A:<B>, B:<empty>, C:<empty>, D:<empty>
            array( 'op' => 'copy', 'src' => $fileA, 'dst' => $fileC ),
            // Now: A:<B>, B:<empty>, C:<B>, D:<empty>
            array( 'op' => 'move', 'src' => $fileA, 'dst' => $fileC, 'overwriteSame' => 1 ),
            // Now: A:<empty>, B:<empty>, C:<B>, D:<empty>
            array( 'op' => 'copy', 'src' => $fileC, 'dst' => $fileC, 'overwrite' => 1 ),
            // Does nothing
            array( 'op' => 'copy', 'src' => $fileC, 'dst' => $fileC, 'overwriteSame' => 1 ),
            // Does nothing
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileC, 'overwrite' => 1 ),
            // Does nothing
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileC, 'overwriteSame' => 1 ),
            // Does nothing
            array( 'op' => 'null' ),
            // Does nothing
        ) );

        $this->assertGoodStatus( $status, "Operation batch succeeded" );
        $this->assertEquals( true, $status->isOK(), "Operation batch succeeded" );
        $this->assertEquals( 16, count( $status->success ),
            "Operation batch has correct success array" );

        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileA ) ),
            "File does not exist at $fileA" );
        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileB ) ),
            "File does not exist at $fileB" );
        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileD ) ),
            "File does not exist at $fileD" );

        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $fileC ) ),
            "File exists at $fileC" );
        $this->assertEquals( $fileBContents,
            $this->backend->getFileContents( array( 'src' => $fileC ) ),
            "Correct file contents of $fileC" );
        $this->assertEquals( strlen( $fileBContents ),
            $this->backend->getFileSize( array( 'src' => $fileC ) ),
            "Correct file size of $fileC" );
        $this->assertEquals( wfBaseConvert( sha1( $fileBContents ), 16, 36, 31 ),
            $this->backend->getFileSha1Base36( array( 'src' => $fileC ) ),
            "Correct file SHA-1 of $fileC" );
    }

    public function testDoOperationsFailing() {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestDoOperationsFailing();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestDoOperationsFailing();
        $this->tearDownFiles();
    }

    private function doTestDoOperationsFailing() {
        $base = self::baseStorePath();

        $fileA = "$base/unittest-cont2/a/b/fileA.txt";
        $fileAContents = '3tqtmoeatmn4wg4qe-mg3qt3 tq';
        $fileB = "$base/unittest-cont2/a/b/fileB.txt";
        $fileBContents = 'g-jmq3gpqgt3qtg q3GT ';
        $fileC = "$base/unittest-cont2/a/b/fileC.txt";
        $fileCContents = 'eigna[ogmewt 3qt g3qg flew[ag';
        $fileD = "$base/unittest-cont2/a/b/fileD.txt";

        $this->prepare( array( 'dir' => dirname( $fileA ) ) );
        $this->create( array( 'dst' => $fileA, 'content' => $fileAContents ) );
        $this->prepare( array( 'dir' => dirname( $fileB ) ) );
        $this->create( array( 'dst' => $fileB, 'content' => $fileBContents ) );
        $this->prepare( array( 'dir' => dirname( $fileC ) ) );
        $this->create( array( 'dst' => $fileC, 'content' => $fileCContents ) );

        $status = $this->backend->doOperations( array(
            array( 'op' => 'copy', 'src' => $fileA, 'dst' => $fileC, 'overwrite' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty> (file:<orginal contents>)
            array( 'op' => 'copy', 'src' => $fileC, 'dst' => $fileA, 'overwriteSame' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty>
            array( 'op' => 'copy', 'src' => $fileB, 'dst' => $fileD, 'overwrite' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<B>
            array( 'op' => 'move', 'src' => $fileC, 'dst' => $fileD ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty> (failed)
            array( 'op' => 'move', 'src' => $fileB, 'dst' => $fileC, 'overwriteSame' => 1 ),
            // Now: A:<A>, B:<B>, C:<A>, D:<empty> (failed)
            array( 'op' => 'move', 'src' => $fileB, 'dst' => $fileA, 'overwrite' => 1 ),
            // Now: A:<B>, B:<empty>, C:<A>, D:<empty>
            array( 'op' => 'delete', 'src' => $fileD ),
            // Now: A:<B>, B:<empty>, C:<A>, D:<empty>
            array( 'op' => 'null' ),
            // Does nothing
        ), array( 'force' => 1 ) );

        $this->assertNotEquals( array(), $status->errors, "Operation had warnings" );
        $this->assertEquals( true, $status->isOK(), "Operation batch succeeded" );
        $this->assertEquals( 8, count( $status->success ),
            "Operation batch has correct success array" );

        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileB ) ),
            "File does not exist at $fileB" );
        $this->assertEquals( false, $this->backend->fileExists( array( 'src' => $fileD ) ),
            "File does not exist at $fileD" );

        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $fileA ) ),
            "File does not exist at $fileA" );
        $this->assertEquals( true, $this->backend->fileExists( array( 'src' => $fileC ) ),
            "File exists at $fileC" );
        $this->assertEquals( $fileBContents,
            $this->backend->getFileContents( array( 'src' => $fileA ) ),
            "Correct file contents of $fileA" );
        $this->assertEquals( strlen( $fileBContents ),
            $this->backend->getFileSize( array( 'src' => $fileA ) ),
            "Correct file size of $fileA" );
        $this->assertEquals( wfBaseConvert( sha1( $fileBContents ), 16, 36, 31 ),
            $this->backend->getFileSha1Base36( array( 'src' => $fileA ) ),
            "Correct file SHA-1 of $fileA" );
    }

    public function testGetFileList() {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetFileList();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetFileList();
        $this->tearDownFiles();
    }

    private function doTestGetFileList() {
        $backendName = $this->backendClass();
        $base = self::baseStorePath();

        // Should have no errors
        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont-notexists" ) );

        $files = array(
            "$base/unittest-cont1/e/test1.txt",
            "$base/unittest-cont1/e/test2.txt",
            "$base/unittest-cont1/e/test3.txt",
            "$base/unittest-cont1/e/subdir1/test1.txt",
            "$base/unittest-cont1/e/subdir1/test2.txt",
            "$base/unittest-cont1/e/subdir2/test3.txt",
            "$base/unittest-cont1/e/subdir2/test4.txt",
            "$base/unittest-cont1/e/subdir2/subdir/test1.txt",
            "$base/unittest-cont1/e/subdir2/subdir/test2.txt",
            "$base/unittest-cont1/e/subdir2/subdir/test3.txt",
            "$base/unittest-cont1/e/subdir2/subdir/test4.txt",
            "$base/unittest-cont1/e/subdir2/subdir/test5.txt",
            "$base/unittest-cont1/e/subdir2/subdir/sub/test0.txt",
            "$base/unittest-cont1/e/subdir2/subdir/sub/120-px-file.txt",
        );

        // Add the files
        $ops = array();
        foreach ( $files as $file ) {
            $this->prepare( array( 'dir' => dirname( $file ) ) );
            $ops[] = array( 'op' => 'create', 'content' => 'xxy', 'dst' => $file );
        }
        $status = $this->backend->doQuickOperations( $ops );
        $this->assertGoodStatus( $status,
            "Creation of files succeeded ($backendName)." );
        $this->assertEquals( true, $status->isOK(),
            "Creation of files succeeded with OK status ($backendName)." );

        // Expected listing at root
        $expected = array(
            "e/test1.txt",
            "e/test2.txt",
            "e/test3.txt",
            "e/subdir1/test1.txt",
            "e/subdir1/test2.txt",
            "e/subdir2/test3.txt",
            "e/subdir2/test4.txt",
            "e/subdir2/subdir/test1.txt",
            "e/subdir2/subdir/test2.txt",
            "e/subdir2/subdir/test3.txt",
            "e/subdir2/subdir/test4.txt",
            "e/subdir2/subdir/test5.txt",
            "e/subdir2/subdir/sub/test0.txt",
            "e/subdir2/subdir/sub/120-px-file.txt",
        );
        sort( $expected );

        // Actual listing (no trailing slash) at root
        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont1" ) );
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct file listing ($backendName)." );

        // Actual listing (no trailing slash) at root with advise
        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont1", 'adviseStat' => 1 ) );
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct file listing ($backendName)." );

        // Actual listing (with trailing slash) at root
        $list = array();
        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont1/" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct file listing ($backendName)." );

        // Expected listing at subdir
        $expected = array(
            "test1.txt",
            "test2.txt",
            "test3.txt",
            "test4.txt",
            "test5.txt",
            "sub/test0.txt",
            "sub/120-px-file.txt",
        );
        sort( $expected );

        // Actual listing (no trailing slash) at subdir
        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont1/e/subdir2/subdir" ) );
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct file listing ($backendName)." );

        // Actual listing (no trailing slash) at subdir with advise
        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont1/e/subdir2/subdir", 'adviseStat' => 1 ) );
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct file listing ($backendName)." );

        // Actual listing (with trailing slash) at subdir
        $list = array();
        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont1/e/subdir2/subdir/" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct file listing ($backendName)." );

        // Actual listing (using iterator second time)
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct file listing ($backendName), second iteration." );

        // Actual listing (top files only) at root
        $iter = $this->backend->getTopFileList( array( 'dir' => "$base/unittest-cont1" ) );
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( array(), $list, "Correct top file listing ($backendName)." );

        // Expected listing (top files only) at subdir
        $expected = array(
            "test1.txt",
            "test2.txt",
            "test3.txt",
            "test4.txt",
            "test5.txt"
        );
        sort( $expected );

        // Actual listing (top files only) at subdir
        $iter = $this->backend->getTopFileList( array( 'dir' => "$base/unittest-cont1/e/subdir2/subdir" ) );
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct top file listing ($backendName)." );

        // Actual listing (top files only) at subdir with advise
        $iter = $this->backend->getTopFileList( array( 'dir' => "$base/unittest-cont1/e/subdir2/subdir", 'adviseStat' => 1 ) );
        $list = $this->listToArray( $iter );
        sort( $list );
        $this->assertEquals( $expected, $list, "Correct top file listing ($backendName)." );

        foreach ( $files as $file ) { // clean up
            $this->backend->doOperation( array( 'op' => 'delete', 'src' => $file ) );
        }

        $iter = $this->backend->getFileList( array( 'dir' => "$base/unittest-cont1/not/exists" ) );
        foreach ( $iter as $iter ) {
            // no errors
        }
    }

    public function testGetDirectoryList() {
        $this->backend = $this->singleBackend;
        $this->tearDownFiles();
        $this->doTestGetDirectoryList();
        $this->tearDownFiles();

        $this->backend = $this->multiBackend;
        $this->tearDownFiles();
        $this->doTestGetDirectoryList();
        $this->tearDownFiles();
    }

    private function doTestGetDirectoryList() {
        $backendName = $this->backendClass();

        $base = self::baseStorePath();
        $files = array(
            "$base/unittest-cont1/e/test1.txt",
            "$base/unittest-cont1/e/test2.txt",
            "$base/unittest-cont1/e/test3.txt",
            "$base/unittest-cont1/e/subdir1/test1.txt",
            "$base/unittest-cont1/e/subdir1/test2.txt",
            "$base/unittest-cont1/e/subdir2/test3.txt",
            "$base/unittest-cont1/e/subdir2/test4.txt",
            "$base/unittest-cont1/e/subdir2/subdir/test1.txt",
            "$base/unittest-cont1/e/subdir3/subdir/test2.txt",
            "$base/unittest-cont1/e/subdir4/subdir/test3.txt",
            "$base/unittest-cont1/e/subdir4/subdir/test4.txt",
            "$base/unittest-cont1/e/subdir4/subdir/test5.txt",
            "$base/unittest-cont1/e/subdir4/subdir/sub/test0.txt",
            "$base/unittest-cont1/e/subdir4/subdir/sub/120-px-file.txt",
        );

        // Add the files
        $ops = array();
        foreach ( $files as $file ) {
            $this->prepare( array( 'dir' => dirname( $file ) ) );
            $ops[] = array( 'op' => 'create', 'content' => 'xxy', 'dst' => $file );
        }
        $status = $this->backend->doQuickOperations( $ops );
        $this->assertGoodStatus( $status,
            "Creation of files succeeded ($backendName)." );
        $this->assertEquals( true, $status->isOK(),
            "Creation of files succeeded with OK status ($backendName)." );

        $this->assertEquals( true,
            $this->backend->directoryExists( array( 'dir' => "$base/unittest-cont1/e/subdir1" ) ),
            "Directory exists in ($backendName)." );
        $this->assertEquals( true,
            $this->backend->directoryExists( array( 'dir' => "$base/unittest-cont1/e/subdir2/subdir" ) ),
            "Directory exists in ($backendName)." );
        $this->assertEquals( false,
            $this->backend->directoryExists( array( 'dir' => "$base/unittest-cont1/e/subdir2/test1.txt" ) ),
            "Directory does not exists in ($backendName)." );

        // Expected listing
        $expected = array(
            "e",
        );
        sort( $expected );

        // Actual listing (no trailing slash)
        $list = array();
        $iter = $this->backend->getTopDirectoryList( array( 'dir' => "$base/unittest-cont1" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct top dir listing ($backendName)." );

        // Expected listing
        $expected = array(
            "subdir1",
            "subdir2",
            "subdir3",
            "subdir4",
        );
        sort( $expected );

        // Actual listing (no trailing slash)
        $list = array();
        $iter = $this->backend->getTopDirectoryList( array( 'dir' => "$base/unittest-cont1/e" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct top dir listing ($backendName)." );

        // Actual listing (with trailing slash)
        $list = array();
        $iter = $this->backend->getTopDirectoryList( array( 'dir' => "$base/unittest-cont1/e/" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct top dir listing ($backendName)." );

        // Expected listing
        $expected = array(
            "subdir",
        );
        sort( $expected );

        // Actual listing (no trailing slash)
        $list = array();
        $iter = $this->backend->getTopDirectoryList( array( 'dir' => "$base/unittest-cont1/e/subdir2" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct top dir listing ($backendName)." );

        // Actual listing (with trailing slash)
        $list = array();
        $iter = $this->backend->getTopDirectoryList( array( 'dir' => "$base/unittest-cont1/e/subdir2/" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct top dir listing ($backendName)." );

        // Actual listing (using iterator second time)
        $list = array();
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct top dir listing ($backendName), second iteration." );

        // Expected listing (recursive)
        $expected = array(
            "e",
            "e/subdir1",
            "e/subdir2",
            "e/subdir3",
            "e/subdir4",
            "e/subdir2/subdir",
            "e/subdir3/subdir",
            "e/subdir4/subdir",
            "e/subdir4/subdir/sub",
        );
        sort( $expected );

        // Actual listing (recursive)
        $list = array();
        $iter = $this->backend->getDirectoryList( array( 'dir' => "$base/unittest-cont1/" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct dir listing ($backendName)." );

        // Expected listing (recursive)
        $expected = array(
            "subdir",
            "subdir/sub",
        );
        sort( $expected );

        // Actual listing (recursive)
        $list = array();
        $iter = $this->backend->getDirectoryList( array( 'dir' => "$base/unittest-cont1/e/subdir4" ) );
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct dir listing ($backendName)." );

        // Actual listing (recursive, second time)
        $list = array();
        foreach ( $iter as $file ) {
            $list[] = $file;
        }
        sort( $list );

        $this->assertEquals( $expected, $list, "Correct dir listing ($backendName)." );

        $iter = $this->backend->getDirectoryList( array( 'dir' => "$base/unittest-cont1/e/subdir1" ) );
        $items = $this->listToArray( $iter );
        $this->assertEquals( array(), $items, "Directory listing is empty." );

        foreach ( $files as $file ) { // clean up
            $this->backend->doOperation( array( 'op' => 'delete', 'src' => $file ) );
        }

        $iter = $this->backend->getDirectoryList( array( 'dir' => "$base/unittest-cont1/not/exists" ) );
        foreach ( $iter as $file ) {
            // no errors
        }

        $items = $this->listToArray( $iter );
        $this->assertEquals( array(), $items, "Directory listing is empty." );

        $iter = $this->backend->getDirectoryList( array( 'dir' => "$base/unittest-cont1/e/not/exists" ) );
        $items = $this->listToArray( $iter );
        $this->assertEquals( array(), $items, "Directory listing is empty." );
    }

    public function testLockCalls() {
        $this->backend = $this->singleBackend;
        $this->doTestLockCalls();
    }

    private function doTestLockCalls() {
        $backendName = $this->backendClass();

        $paths = array(
            "test1.txt",
            "test2.txt",
            "test3.txt",
            "subdir1",
            "subdir1", // duplicate
            "subdir1/test1.txt",
            "subdir1/test2.txt",
            "subdir2",
            "subdir2", // duplicate
            "subdir2/test3.txt",
            "subdir2/test4.txt",
            "subdir2/subdir",
            "subdir2/subdir/test1.txt",
            "subdir2/subdir/test2.txt",
            "subdir2/subdir/test3.txt",
            "subdir2/subdir/test4.txt",
            "subdir2/subdir/test5.txt",
            "subdir2/subdir/sub",
            "subdir2/subdir/sub/test0.txt",
            "subdir2/subdir/sub/120-px-file.txt",
        );

        for ( $i = 0; $i < 25; $i++ ) {
            $status = $this->backend->lockFiles( $paths, LockManager::LOCK_EX );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName) ($i)." );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );

            $status = $this->backend->lockFiles( $paths, LockManager::LOCK_SH );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName) ($i)." );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );

            $status = $this->backend->unlockFiles( $paths, LockManager::LOCK_SH );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName) ($i)." );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );

            $status = $this->backend->unlockFiles( $paths, LockManager::LOCK_EX );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName). ($i)" );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );

            ## Flip the acquire/release ordering around ##

            $status = $this->backend->lockFiles( $paths, LockManager::LOCK_SH );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName) ($i)." );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );

            $status = $this->backend->lockFiles( $paths, LockManager::LOCK_EX );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName) ($i)." );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );

            $status = $this->backend->unlockFiles( $paths, LockManager::LOCK_EX );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName). ($i)" );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );

            $status = $this->backend->unlockFiles( $paths, LockManager::LOCK_SH );
            $this->assertEquals( print_r( array(), true ), print_r( $status->errors, true ),
                "Locking of files succeeded ($backendName) ($i)." );
            $this->assertEquals( true, $status->isOK(),
                "Locking of files succeeded with OK status ($backendName) ($i)." );
        }

        $status = Status::newGood();
        $sl = $this->backend->getScopedFileLocks( $paths, LockManager::LOCK_EX, $status );
        $this->assertType( 'ScopedLock', $sl,
            "Scoped locking of files succeeded ($backendName)." );
        $this->assertEquals( array(), $status->errors,
            "Scoped locking of files succeeded ($backendName)." );
        $this->assertEquals( true, $status->isOK(),
            "Scoped locking of files succeeded with OK status ($backendName)." );

        ScopedLock::release( $sl );
        $this->assertEquals( null, $sl,
            "Scoped unlocking of files succeeded ($backendName)." );
        $this->assertEquals( array(), $status->errors,
            "Scoped unlocking of files succeeded ($backendName)." );
        $this->assertEquals( true, $status->isOK(),
            "Scoped unlocking of files succeeded with OK status ($backendName)." );
    }

    // helper function
    private function listToArray( $iter ) {
        return is_array( $iter ) ? $iter : iterator_to_array( $iter );
    }

    // test helper wrapper for backend prepare() function
    private function prepare( array $params ) {
        return $this->backend->prepare( $params );
    }

    // test helper wrapper for backend prepare() function
    private function create( array $params ) {
        $params['op'] = 'create';

        return $this->backend->doQuickOperations( array( $params ) );
    }

    function tearDownFiles() {
        foreach ( $this->filesToPrune as $file ) {
            if ( is_file( $file ) ) {
                unlink( $file );
            }
        }
        $containers = array( 'unittest-cont1', 'unittest-cont2' );
        foreach ( $containers as $container ) {
            $this->deleteFiles( $container );
        }
        $this->filesToPrune = array();
    }

    private function deleteFiles( $container ) {
        $base = self::baseStorePath();
        $iter = $this->backend->getFileList( array( 'dir' => "$base/$container" ) );
        if ( $iter ) {
            foreach ( $iter as $file ) {
                $this->backend->quickDelete( array( 'src' => "$base/$container/$file" ) );
            }
            // free the directory, to avoid Permission denied under windows on rmdir
            unset( $iter );
        }
        $this->backend->clean( array( 'dir' => "$base/$container", 'recursive' => 1 ) );
    }

    function assertBackendPathsConsistent( array $paths ) {
        if ( $this->backend instanceof FileBackendMultiWrite ) {
            $status = $this->backend->consistencyCheck( $paths );
            $this->assertGoodStatus( $status, "Files synced: " . implode( ',', $paths ) );
        }
    }

    function assertGoodStatus( $status, $msg ) {
        $this->assertEquals( print_r( array(), 1 ), print_r( $status->errors, 1 ), $msg );
    }
}