DiffHistoryBlobTest.php

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<?php

class DiffHistoryBlobTest extends MediaWikiTestCase {
        function setUp() {
                if ( !extension_loaded( 'xdiff' ) ) {
                        $this->markTestSkipped( 'The xdiff extension is not available' );
                        return;
                }
                if ( !function_exists( 'xdiff_string_rabdiff' ) ) {
                        $this->markTestSkipped( 'The version of xdiff extension is lower than 1.5.0' );
                        return;
                }
                if ( !extension_loaded( 'hash' ) && !extension_loaded( 'mhash' ) ) {
                        $this->markTestSkipped( 'Neither the hash nor mhash extension is available' );
                        return;
                }
        }

        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" ) );
        }

        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)" )
                );
        }
}