DiffHistoryBlobTest.php

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<?php

class DiffHistoryBlobTest extends MediaWikiTestCase {

    protected function setUp() {
        parent::setUp();

        $this->checkPHPExtension( 'hash' );
        $this->checkPHPExtension( 'xdiff' );

        if ( !function_exists( 'xdiff_string_rabdiff' ) ) {
            $this->markTestSkipped( 'The version of xdiff extension is lower than 1.5.0' );

            return;
        }
    }

    public function testXdiffAdler32( $input ) {
        $xdiffHash = substr( xdiff_string_rabdiff( $input, '' ), 0, 4 );
        $dhb = new DiffHistoryBlob;
        $myHash = $dhb->xdiffAdler32( $input );
        $this->assertSame( bin2hex( $xdiffHash ), bin2hex( $myHash ),
            "Hash of " . addcslashes( $input, "\0..\37!@\@\177..\377" ) );
    }

    public static function provideXdiffAdler32() {
        return array(
            array( '', 'Empty string' ),
            array( "\0", 'Null' ),
            array( "\0\0\0", "Several nulls" ),
            array( "Hello", "An ASCII string" ),
            array( str_repeat( "x", 6000 ), "A string larger than xdiff's NMAX (5552)" )
        );
    }
}