+ [misc] Add unit tests for actionModel::printChanges() method

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

module/action/test/lib/action.unittest.class.php

@@ -989,4 +989,26 @@ class actionTest
 
         return $output;
     }
+
+    /**
+     * Test printChanges method.
+     *
+     * @param  string $objectType
+     * @param  int    $objectID
+     * @param  array  $histories
+     * @param  bool   $canChangeTag
+     * @access public
+     * @return string
+     */
+    public function printChangesTest(string $objectType, int $objectID, array $histories, bool $canChangeTag = true): string
+    {
+        ob_start();
+        $this->objectModel->printChanges($objectType, $objectID, $histories, $canChangeTag);
+        $output = ob_get_contents();
+        ob_end_clean();
+
+        if(dao::isError()) return dao::getError();
+
+        return $output;
+    }
 }

module/action/test/model/printchanges.php

@@ -0,0 +1,29 @@
+#!/usr/bin/env php
+<?php
+
+/**
+
+title=测试 actionModel::printChanges();
+timeout=0
+cid=0
+
+- 步骤1：空历史记录 @0
+- 步骤2：单个字段变更 @~任务状态~
+- 步骤3：指派给字段变更 @~指派给~
+- 步骤4：包含diff信息的变更 @~diff~
+- 步骤5：canChangeTag为false的测试 @~任务名称~
+
+*/
+
+include dirname(__FILE__, 5) . '/test/lib/init.php';
+include dirname(__FILE__, 2) . '/lib/action.unittest.class.php';
+
+su('admin');
+
+$actionTest = new actionTest();
+
+r($actionTest->printChangesTest('task', 1, array())) && p() && e('0'); // 步骤1：空历史记录
+r($actionTest->printChangesTest('task', 1, array((object)array('field' => 'status', 'old' => '待处理', 'new' => '进行中', 'diff' => '')))) && p() && e('~任务状态~'); // 步骤2：单个字段变更
+r($actionTest->printChangesTest('task', 1, array((object)array('field' => 'assignedTo', 'old' => 'admin', 'new' => 'user1', 'diff' => '')))) && p() && e('~指派给~'); // 步骤3：指派给字段变更
+r($actionTest->printChangesTest('task', 1, array((object)array('field' => 'description', 'old' => '旧描述', 'new' => '新描述', 'diff' => '<del>旧描述</del><ins>新描述</ins>')))) && p() && e('~diff~'); // 步骤4：包含diff信息的变更
+r($actionTest->printChangesTest('task', 1, array((object)array('field' => 'title', 'old' => '旧标题', 'new' => '新标题', 'diff' => '')), false)) && p() && e('~任务名称~'); // 步骤5：canChangeTag为false的测试