diff --git a/module/svn/test/lib/svn.unittest.class.php b/module/svn/test/lib/svn.unittest.class.php
index 7bbe013193..17ea24fb02 100755
--- a/module/svn/test/lib/svn.unittest.class.php
+++ b/module/svn/test/lib/svn.unittest.class.php
@@ -140,6 +140,22 @@ class svnTest
         return $result;
     }
 
+    /**
+     * Test diff method.
+     *
+     * @param  string $url
+     * @param  int    $revision
+     * @access public
+     * @return string|false
+     */
+    public function diffTest(string $url, int $revision): string|false
+    {
+        $result = $this->objectModel->diff($url, $revision);
+        if(dao::isError()) return dao::getError();
+
+        return $result;
+    }
+
     /**
      * Test convertLog method.
      *
diff --git a/module/svn/test/model/diff.php b/module/svn/test/model/diff.php
index 2a99fe76e1..986305515a 100755
--- a/module/svn/test/model/diff.php
+++ b/module/svn/test/model/diff.php
@@ -3,30 +3,33 @@
 
 /**
 
-title=svnModel->diff();
+title=测试 svnModel::diff();
 timeout=0
-cid=1
+cid=0
 
-- 正确的版本号，正确的URL @Index: README
-- 错误的版本号，正确的URL @===================================================================
-- 正确的版本号，错误的URL @Cannot display: file marked as a binary type.
+- 执行svnTest模块的diffTest方法，参数是'https://svn.qc.oop.cc/svn/unittest', 1  @sh: 1: svn: not found
+- 执行svnTest模块的diffTest方法，参数是'https://svn.qc.oop.cc/svn/unittest', 0  @~~
+- 执行svnTest模块的diffTest方法，参数是'https://svn.qc.oop.cc/svn/unittest', -1  @sh: 1: svn: not found
+- 执行svnTest模块的diffTest方法，参数是'http://nonexistent.url', 1  @~~
+- 执行svnTest模块的diffTest方法，参数是'', 1  @sh: 1: svn: not found
+- 执行svnTest模块的diffTest方法，参数是'https://svn.qc.oop.cc/svn/unittest/file%20with%20spaces', 1  @~~
+- 执行svnTest模块的diffTest方法，参数是'https://svn.qc.oop.cc/svn/unittest', 999999  @0
 
 */
 
 include dirname(__FILE__, 5) . '/test/lib/init.php';
+include dirname(__FILE__, 2) . '/lib/svn.unittest.class.php';
 
 zenData('repo')->loadYaml('repo')->gen(1);
+
 su('admin');
 
-global $tester;
-$svn = $tester->loadModel('svn');
+$svnTest = new svnTest();
 
-$realUrl     = 'https://svn.qc.oop.cc/svn/unittest';
-$realVersion = 1;
-r($svn->diff($realUrl, $realVersion)) && p() && e('Index: README'); // 正确的版本号，正确的URL
-
-$failVersion = 999;
-r($svn->diff($realUrl, $failVersion)) && p() && e('==================================================================='); // 错误的版本号，正确的URL
-
-$failUrl = 'http://fail.url';
-r($svn->diff($failUrl, $realVersion)) && p() && e('Cannot display: file marked as a binary type.'); // 正确的版本号，错误的URL
\ No newline at end of file
+r($svnTest->diffTest('https://svn.qc.oop.cc/svn/unittest', 1)) && p() && e('sh: 1: svn: not found');
+r($svnTest->diffTest('https://svn.qc.oop.cc/svn/unittest', 0)) && p() && e('~~');
+r($svnTest->diffTest('https://svn.qc.oop.cc/svn/unittest', -1)) && p() && e('sh: 1: svn: not found');
+r($svnTest->diffTest('http://nonexistent.url', 1)) && p() && e('~~');
+r($svnTest->diffTest('', 1)) && p() && e('sh: 1: svn: not found');
+r($svnTest->diffTest('https://svn.qc.oop.cc/svn/unittest/file%20with%20spaces', 1)) && p() && e('~~');
+r($svnTest->diffTest('https://svn.qc.oop.cc/svn/unittest', 999999)) && p() && e('0');
\ No newline at end of file