* Refactor upgradeModel::isError, and add its unit test.

module/upgrade/model.php

@@ -2108,12 +2108,13 @@ class upgradeModel extends model
     }
 
     /**
+     * 判断是否出现错误。
      * Judge any error occurs.
      *
      * @access public
      * @return bool
      */
-    public function isError()
+    public function isError(): bool
     {
         return !empty(static::$errors);
     }

module/upgrade/test/model/iserror.php

@@ -0,0 +1,27 @@
+#!/usr/bin/env php
+<?php
+declare(strict_types=1);
+
+/**
+
+title=测试 upgradeModel->isError();
+cid=1
+
+- 测试 static::$errors 为 errors 时，是否有报错 @1
+- 测试 static::$errors 为 emptyErrors 时，是否有报错 @0
+
+**/
+
+include dirname(__FILE__, 5) . '/test/lib/init.php';
+include dirname(__FILE__, 2) . '/upgrade.class.php';
+
+zdTable('user')->config('user')->gen(5);
+
+su('admin');
+
+$upgrade = new upgradeTest();
+
+$errors      = array('error1', 'error2', 'error3');
+$emptyErrors = array();
+r($upgrade->isErrorTest($errors))      && p() && e('1'); // 测试 static::$errors 为 errors 时，是否有报错
+r($upgrade->isErrorTest($emptyErrors)) && p() && e('0'); // 测试 static::$errors 为 emptyErrors 时，是否有报错

module/upgrade/test/upgrade.class.php

@@ -191,4 +191,18 @@ class upgradeTest
         $groupPrivs = $tester->dao->select('count(1) as count')->from(TABLE_GROUPPRIV)->fetch('count');
         return "groups:{$groups},groupPrivs:{$groupPrivs}";
     }
+
+    /**
+     * 测试判断是否出现错误。
+     * Test judge any error occurs.
+     *
+     * @param  array  $errors
+     * @access public
+     * @return bool
+     */
+    public function isErrorTest(array $errors): bool
+    {
+        $this->objectModel::$errors = $errors;
+        return $this->objectModel->isError();
+    }
 }