MaintenanceTest.php

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<?php

// It would be great if we were able to use PHPUnit's getMockForAbstractClass
// instead of the MaintenanceFixup hack below. However, we cannot do
// without changing the visibility and without working around hacks in
// Maintenance.php
//
// For the same reason, we cannot just use FakeMaintenance.

class MaintenanceFixup extends Maintenance {

    // --- Making up for the register_shutdown_function hack in Maintenance.php

    private $testCase;

    private $shutdownSimulated = false;

    public function simulateShutdown() {

        if ( $this->shutdownSimulated ) {
            $this->testCase->fail( __METHOD__ . " called more than once" );
        }

        // The cleanup action.
        $this->outputChanneled( false );

        // Bookkeeping that we simulated the clean up.
        $this->shutdownSimulated = true;
    }

    // Note that the "public" here does not change visibility
    public function outputChanneled( $msg, $channel = null ) {
        if ( $this->shutdownSimulated ) {
            if ( $msg !== false ) {
                $this->testCase->fail( "Already past simulated shutdown, but msg is "
                    . "not false. Did the hack in Maintenance.php change? Please "
                    . "adapt the test case or Maintenance.php" );
            }

            // The current call is the one registered via register_shutdown_function.
            // We can safely ignore it, as we simulated this one via simulateShutdown
            // before (if we did not, the destructor of this instance will warn about
            // it)
            return;
        }

        return call_user_func_array( array( "parent", __FUNCTION__ ), func_get_args() );
    }

    public function __destruct() {
        if ( !$this->shutdownSimulated ) {
            // Someone generated a MaintenanceFixup instance without calling
            // simulateShutdown. We'd have to raise a PHPUnit exception to correctly
            // flag this illegal usage. However, we are already in a destruktor, which
            // would trigger undefined behavior. Hence, we can only report to the
            // error output :( Hopefully people read the PHPUnit output.
            $name = $this->testCase->getName();
            fwrite( STDERR, "ERROR! Instance of " . __CLASS__ . " for test $name "
                . "destructed without calling simulateShutdown method. Call "
                . "simulateShutdown on the instance before it gets destructed." );
        }

        // The following guard is required, as PHP does not offer default destructors :(
        if ( is_callable( "parent::__destruct" ) ) {
            parent::__destruct();
        }
    }

    public function __construct( MediaWikiTestCase $testCase ) {
        parent::__construct();
        $this->testCase = $testCase;
    }


    // --- Making protected functions visible for test

    public function output( $out, $channel = null ) {
        // Just to make PHP not nag about signature mismatches, we copied
        // Maintenance::output signature. However, we do not use (or rely on)
        // those variables. Instead we pass to Maintenance::output whatever we
        // receive at runtime.
        return call_user_func_array( array( "parent", __FUNCTION__ ), func_get_args() );
    }


    // --- Requirements for getting instance of abstract class

    public function execute() {
        $this->testCase->fail( __METHOD__ . " called unexpectedly" );
    }
}

class MaintenanceTest extends MediaWikiTestCase {


    private $m;


    protected function setUp() {
        parent::setUp();
        $this->m = new MaintenanceFixup( $this );
    }

    protected function tearDown() {
        if ( $this->m ) {
            $this->m->simulateShutdown();
            $this->m = null;
        }
        parent::tearDown();
    }


    private function assertOutputPrePostShutdown( $preShutdownOutput, $expectNLAppending ) {

        $this->assertEquals( $preShutdownOutput, $this->getActualOutput(),
            "Output before shutdown simulation" );

        $this->m->simulateShutdown();
        $this->m = null;

        $postShutdownOutput = $preShutdownOutput . ( $expectNLAppending ? "\n" : "" );
        $this->expectOutputString( $postShutdownOutput );
    }


    // Although the following tests do not seem to be too consistent (compare for
    // example the newlines within the test.*StringString tests, or the
    // test.*Intermittent.* tests), the objective of these tests is not to describe
    // consistent behavior, but rather currently existing behavior.

    function testOutputEmpty() {
        $this->m->output( "" );
        $this->assertOutputPrePostShutdown( "", false );
    }

    function testOutputString() {
        $this->m->output( "foo" );
        $this->assertOutputPrePostShutdown( "foo", false );
    }

    function testOutputStringString() {
        $this->m->output( "foo" );
        $this->m->output( "bar" );
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testOutputStringNL() {
        $this->m->output( "foo\n" );
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testOutputStringNLNL() {
        $this->m->output( "foo\n\n" );
        $this->assertOutputPrePostShutdown( "foo\n\n", false );
    }

    function testOutputStringNLString() {
        $this->m->output( "foo\nbar" );
        $this->assertOutputPrePostShutdown( "foo\nbar", false );
    }

    function testOutputStringNLStringNL() {
        $this->m->output( "foo\nbar\n" );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputStringNLStringNLLinewise() {
        $this->m->output( "foo\n" );
        $this->m->output( "bar\n" );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputStringNLStringNLArbitrary() {
        $this->m->output( "" );
        $this->m->output( "foo" );
        $this->m->output( "" );
        $this->m->output( "\n" );
        $this->m->output( "ba" );
        $this->m->output( "" );
        $this->m->output( "r\n" );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputStringNLStringNLArbitraryAgain() {
        $this->m->output( "" );
        $this->m->output( "foo" );
        $this->m->output( "" );
        $this->m->output( "\nb" );
        $this->m->output( "a" );
        $this->m->output( "" );
        $this->m->output( "r\n" );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputWNullChannelEmpty() {
        $this->m->output( "", null );
        $this->assertOutputPrePostShutdown( "", false );
    }

    function testOutputWNullChannelString() {
        $this->m->output( "foo", null );
        $this->assertOutputPrePostShutdown( "foo", false );
    }

    function testOutputWNullChannelStringString() {
        $this->m->output( "foo", null );
        $this->m->output( "bar", null );
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testOutputWNullChannelStringNL() {
        $this->m->output( "foo\n", null );
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testOutputWNullChannelStringNLNL() {
        $this->m->output( "foo\n\n", null );
        $this->assertOutputPrePostShutdown( "foo\n\n", false );
    }

    function testOutputWNullChannelStringNLString() {
        $this->m->output( "foo\nbar", null );
        $this->assertOutputPrePostShutdown( "foo\nbar", false );
    }

    function testOutputWNullChannelStringNLStringNL() {
        $this->m->output( "foo\nbar\n", null );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputWNullChannelStringNLStringNLLinewise() {
        $this->m->output( "foo\n", null );
        $this->m->output( "bar\n", null );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputWNullChannelStringNLStringNLArbitrary() {
        $this->m->output( "", null );
        $this->m->output( "foo", null );
        $this->m->output( "", null );
        $this->m->output( "\n", null );
        $this->m->output( "ba", null );
        $this->m->output( "", null );
        $this->m->output( "r\n", null );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputWNullChannelStringNLStringNLArbitraryAgain() {
        $this->m->output( "", null );
        $this->m->output( "foo", null );
        $this->m->output( "", null );
        $this->m->output( "\nb", null );
        $this->m->output( "a", null );
        $this->m->output( "", null );
        $this->m->output( "r\n", null );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputWChannelString() {
        $this->m->output( "foo", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo", true );
    }

    function testOutputWChannelStringNL() {
        $this->m->output( "foo\n", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo", true );
    }

    function testOutputWChannelStringNLNL() {
        // If this test fails, note that output takes strings with double line
        // endings (although output's implementation in this situation calls
        // outputChanneled with a string ending in a nl ... which is not allowed
        // according to the documentation of outputChanneled)
        $this->m->output( "foo\n\n", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\n", true );
    }

    function testOutputWChannelStringNLString() {
        $this->m->output( "foo\nbar", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testOutputWChannelStringNLStringNL() {
        $this->m->output( "foo\nbar\n", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testOutputWChannelStringNLStringNLLinewise() {
        $this->m->output( "foo\n", "bazChannel" );
        $this->m->output( "bar\n", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar", true );
    }

    function testOutputWChannelStringNLStringNLArbitrary() {
        $this->m->output( "", "bazChannel" );
        $this->m->output( "foo", "bazChannel" );
        $this->m->output( "", "bazChannel" );
        $this->m->output( "\n", "bazChannel" );
        $this->m->output( "ba", "bazChannel" );
        $this->m->output( "", "bazChannel" );
        $this->m->output( "r\n", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar", true );
    }

    function testOutputWChannelStringNLStringNLArbitraryAgain() {
        $this->m->output( "", "bazChannel" );
        $this->m->output( "foo", "bazChannel" );
        $this->m->output( "", "bazChannel" );
        $this->m->output( "\nb", "bazChannel" );
        $this->m->output( "a", "bazChannel" );
        $this->m->output( "", "bazChannel" );
        $this->m->output( "r\n", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testOutputWMultipleChannelsChannelChange() {
        $this->m->output( "foo", "bazChannel" );
        $this->m->output( "bar", "bazChannel" );
        $this->m->output( "qux", "quuxChannel" );
        $this->m->output( "corge", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar\nqux\ncorge", true );
    }

    function testOutputWMultipleChannelsChannelChangeNL() {
        $this->m->output( "foo", "bazChannel" );
        $this->m->output( "bar\n", "bazChannel" );
        $this->m->output( "qux\n", "quuxChannel" );
        $this->m->output( "corge", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar\nqux\ncorge", true );
    }

    function testOutputWAndWOChannelStringStartWO() {
        $this->m->output( "foo" );
        $this->m->output( "bar", "bazChannel" );
        $this->m->output( "qux" );
        $this->m->output( "quux", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar\nquxquux", true );
    }

    function testOutputWAndWOChannelStringStartW() {
        $this->m->output( "foo", "bazChannel" );
        $this->m->output( "bar" );
        $this->m->output( "qux", "bazChannel" );
        $this->m->output( "quux" );
        $this->assertOutputPrePostShutdown( "foo\nbarqux\nquux", false );
    }

    function testOutputWChannelTypeSwitch() {
        $this->m->output( "foo", 1 );
        $this->m->output( "bar", 1.0 );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testOutputIntermittentEmpty() {
        $this->m->output( "foo" );
        $this->m->output( "" );
        $this->m->output( "bar" );
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testOutputIntermittentFalse() {
        $this->m->output( "foo" );
        $this->m->output( false );
        $this->m->output( "bar" );
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testOutputIntermittentFalseAfterOtherChannel() {
        $this->m->output( "qux", "quuxChannel" );
        $this->m->output( "foo" );
        $this->m->output( false );
        $this->m->output( "bar" );
        $this->assertOutputPrePostShutdown( "qux\nfoobar", false );
    }

    function testOutputWNullChannelIntermittentEmpty() {
        $this->m->output( "foo", null );
        $this->m->output( "", null );
        $this->m->output( "bar", null );
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testOutputWNullChannelIntermittentFalse() {
        $this->m->output( "foo", null );
        $this->m->output( false, null );
        $this->m->output( "bar", null );
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testOutputWChannelIntermittentEmpty() {
        $this->m->output( "foo", "bazChannel" );
        $this->m->output( "", "bazChannel" );
        $this->m->output( "bar", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar", true );
    }

    function testOutputWChannelIntermittentFalse() {
        $this->m->output( "foo", "bazChannel" );
        $this->m->output( false, "bazChannel" );
        $this->m->output( "bar", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar", true );
    }

    // Note that (per documentation) outputChanneled does take strings that end
    // in \n, hence we do not test such strings.

    function testOutputChanneledEmpty() {
        $this->m->outputChanneled( "" );
        $this->assertOutputPrePostShutdown( "\n", false );
    }

    function testOutputChanneledString() {
        $this->m->outputChanneled( "foo" );
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testOutputChanneledStringString() {
        $this->m->outputChanneled( "foo" );
        $this->m->outputChanneled( "bar" );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputChanneledStringNLString() {
        $this->m->outputChanneled( "foo\nbar" );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputChanneledStringNLStringNLArbitraryAgain() {
        $this->m->outputChanneled( "" );
        $this->m->outputChanneled( "foo" );
        $this->m->outputChanneled( "" );
        $this->m->outputChanneled( "\nb" );
        $this->m->outputChanneled( "a" );
        $this->m->outputChanneled( "" );
        $this->m->outputChanneled( "r" );
        $this->assertOutputPrePostShutdown( "\nfoo\n\n\nb\na\n\nr\n", false );
    }

    function testOutputChanneledWNullChannelEmpty() {
        $this->m->outputChanneled( "", null );
        $this->assertOutputPrePostShutdown( "\n", false );
    }

    function testOutputChanneledWNullChannelString() {
        $this->m->outputChanneled( "foo", null );
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testOutputChanneledWNullChannelStringString() {
        $this->m->outputChanneled( "foo", null );
        $this->m->outputChanneled( "bar", null );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputChanneledWNullChannelStringNLString() {
        $this->m->outputChanneled( "foo\nbar", null );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputChanneledWNullChannelStringNLStringNLArbitraryAgain() {
        $this->m->outputChanneled( "", null );
        $this->m->outputChanneled( "foo", null );
        $this->m->outputChanneled( "", null );
        $this->m->outputChanneled( "\nb", null );
        $this->m->outputChanneled( "a", null );
        $this->m->outputChanneled( "", null );
        $this->m->outputChanneled( "r", null );
        $this->assertOutputPrePostShutdown( "\nfoo\n\n\nb\na\n\nr\n", false );
    }

    function testOutputChanneledWChannelString() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo", true );
    }

    function testOutputChanneledWChannelStringNLString() {
        $this->m->outputChanneled( "foo\nbar", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testOutputChanneledWChannelStringString() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( "bar", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar", true );
    }

    function testOutputChanneledWChannelStringNLStringNLArbitraryAgain() {
        $this->m->outputChanneled( "", "bazChannel" );
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( "", "bazChannel" );
        $this->m->outputChanneled( "\nb", "bazChannel" );
        $this->m->outputChanneled( "a", "bazChannel" );
        $this->m->outputChanneled( "", "bazChannel" );
        $this->m->outputChanneled( "r", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testOutputChanneledWMultipleChannelsChannelChange() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( "bar", "bazChannel" );
        $this->m->outputChanneled( "qux", "quuxChannel" );
        $this->m->outputChanneled( "corge", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar\nqux\ncorge", true );
    }

    function testOutputChanneledWMultipleChannelsChannelChangeEnclosedNull() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( "bar", null );
        $this->m->outputChanneled( "qux", null );
        $this->m->outputChanneled( "corge", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar\nqux\ncorge", true );
    }

    function testOutputChanneledWMultipleChannelsChannelAfterNullChange() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( "bar", null );
        $this->m->outputChanneled( "qux", null );
        $this->m->outputChanneled( "corge", "quuxChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar\nqux\ncorge", true );
    }

    function testOutputChanneledWAndWOChannelStringStartWO() {
        $this->m->outputChanneled( "foo" );
        $this->m->outputChanneled( "bar", "bazChannel" );
        $this->m->outputChanneled( "qux" );
        $this->m->outputChanneled( "quux", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar\nqux\nquux", true );
    }

    function testOutputChanneledWAndWOChannelStringStartW() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( "bar" );
        $this->m->outputChanneled( "qux", "bazChannel" );
        $this->m->outputChanneled( "quux" );
        $this->assertOutputPrePostShutdown( "foo\nbar\nqux\nquux\n", false );
    }

    function testOutputChanneledWChannelTypeSwitch() {
        $this->m->outputChanneled( "foo", 1 );
        $this->m->outputChanneled( "bar", 1.0 );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testOutputChanneledWOChannelIntermittentEmpty() {
        $this->m->outputChanneled( "foo" );
        $this->m->outputChanneled( "" );
        $this->m->outputChanneled( "bar" );
        $this->assertOutputPrePostShutdown( "foo\n\nbar\n", false );
    }

    function testOutputChanneledWOChannelIntermittentFalse() {
        $this->m->outputChanneled( "foo" );
        $this->m->outputChanneled( false );
        $this->m->outputChanneled( "bar" );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputChanneledWNullChannelIntermittentEmpty() {
        $this->m->outputChanneled( "foo", null );
        $this->m->outputChanneled( "", null );
        $this->m->outputChanneled( "bar", null );
        $this->assertOutputPrePostShutdown( "foo\n\nbar\n", false );
    }

    function testOutputChanneledWNullChannelIntermittentFalse() {
        $this->m->outputChanneled( "foo", null );
        $this->m->outputChanneled( false, null );
        $this->m->outputChanneled( "bar", null );
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testOutputChanneledWChannelIntermittentEmpty() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( "", "bazChannel" );
        $this->m->outputChanneled( "bar", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foobar", true );
    }

    function testOutputChanneledWChannelIntermittentFalse() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->outputChanneled( false, "bazChannel" );
        $this->m->outputChanneled( "bar", "bazChannel" );
        $this->assertOutputPrePostShutdown( "foo\nbar", true );
    }

    function testCleanupChanneledClean() {
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "", false );
    }

    function testCleanupChanneledAfterOutput() {
        $this->m->output( "foo" );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo", false );
    }

    function testCleanupChanneledAfterOutputWNullChannel() {
        $this->m->output( "foo", null );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo", false );
    }

    function testCleanupChanneledAfterOutputWChannel() {
        $this->m->output( "foo", "bazChannel" );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testCleanupChanneledAfterNLOutput() {
        $this->m->output( "foo\n" );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testCleanupChanneledAfterNLOutputWNullChannel() {
        $this->m->output( "foo\n", null );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testCleanupChanneledAfterNLOutputWChannel() {
        $this->m->output( "foo\n", "bazChannel" );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testCleanupChanneledAfterOutputChanneledWOChannel() {
        $this->m->outputChanneled( "foo" );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testCleanupChanneledAfterOutputChanneledWNullChannel() {
        $this->m->outputChanneled( "foo", null );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testCleanupChanneledAfterOutputChanneledWChannel() {
        $this->m->outputChanneled( "foo", "bazChannel" );
        $this->m->cleanupChanneled();
        $this->assertOutputPrePostShutdown( "foo\n", false );
    }

    function testMultipleMaintenanceObjectsInteractionOutput() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->output( "foo" );
        $m2->output( "bar" );

        $this->assertEquals( "foobar", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testMultipleMaintenanceObjectsInteractionOutputWNullChannel() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->output( "foo", null );
        $m2->output( "bar", null );

        $this->assertEquals( "foobar", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foobar", false );
    }

    function testMultipleMaintenanceObjectsInteractionOutputWChannel() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->output( "foo", "bazChannel" );
        $m2->output( "bar", "bazChannel" );

        $this->assertEquals( "foobar", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foobar\n", true );
    }

    function testMultipleMaintenanceObjectsInteractionOutputWNullChannelNL() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->output( "foo\n", null );
        $m2->output( "bar\n", null );

        $this->assertEquals( "foo\nbar\n", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testMultipleMaintenanceObjectsInteractionOutputWChannelNL() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->output( "foo\n", "bazChannel" );
        $m2->output( "bar\n", "bazChannel" );

        $this->assertEquals( "foobar", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foobar\n", true );
    }

    function testMultipleMaintenanceObjectsInteractionOutputChanneled() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->outputChanneled( "foo" );
        $m2->outputChanneled( "bar" );

        $this->assertEquals( "foo\nbar\n", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testMultipleMaintenanceObjectsInteractionOutputChanneledWNullChannel() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->outputChanneled( "foo", null );
        $m2->outputChanneled( "bar", null );

        $this->assertEquals( "foo\nbar\n", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foo\nbar\n", false );
    }

    function testMultipleMaintenanceObjectsInteractionOutputChanneledWChannel() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->outputChanneled( "foo", "bazChannel" );
        $m2->outputChanneled( "bar", "bazChannel" );

        $this->assertEquals( "foobar", $this->getActualOutput(),
            "Output before shutdown simulation (m2)" );
        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foobar\n", true );
    }

    function testMultipleMaintenanceObjectsInteractionCleanupChanneledWChannel() {
        $m2 = new MaintenanceFixup( $this );

        $this->m->outputChanneled( "foo", "bazChannel" );
        $m2->outputChanneled( "bar", "bazChannel" );

        $this->assertEquals( "foobar", $this->getActualOutput(),
            "Output before first cleanup" );
        $this->m->cleanupChanneled();
        $this->assertEquals( "foobar\n", $this->getActualOutput(),
            "Output after first cleanup" );
        $m2->cleanupChanneled();
        $this->assertEquals( "foobar\n\n", $this->getActualOutput(),
            "Output after second cleanup" );

        $m2->simulateShutdown();
        $this->assertOutputPrePostShutdown( "foobar\n\n", false );
    }
}