1 files changed, 44 insertions, 0 deletions
diff --git a/tests/phpunit/includes/DiffHistoryBlobTest.php b/tests/phpunit/includes/DiffHistoryBlobTest.php
new file mode 100644
index 00000000..a4d5b91a
--- /dev/null
+++ b/tests/phpunit/includes/DiffHistoryBlobTest.php
@@ -0,0 +1,44 @@
+<?php
+
+class DiffHistoryBlobTest extends MediaWikiTestCase {
+	protected 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' ) ) {
+			$this->markTestSkipped( 'The hash extension is not available' );
+
+			return;
+		}
+		parent::setUp();
+	}
+
+	/**
+	 * Test for DiffHistoryBlob::xdiffAdler32()
+	 * @dataProvider provideXdiffAdler32
+	 */
+	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)" )
+		);
+	}
+}