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 function provideXdiffAdler32() {
        // Hack non-empty early return since PHPUnit expands this provider before running
        // the setUp() which marks the test as skipped.
        if ( !function_exists( 'xdiff_string_rabdiff' ) ) {
            return [ [ '', 'Empty string' ] ];
        }

        return [
            [ '', 'Empty string' ],
            [ "\0", 'Null' ],
            [ "\0\0\0", "Several nulls" ],
            [ "Hello", "An ASCII string" ],
            [ str_repeat( "x", 6000 ), "A string larger than xdiff's NMAX (5552)" ]
        ];
    }
}