Simplify yield test for `Command::batchInsert()`. (#16007)

tests/framework/db/CommandTest.php

@@ -307,7 +307,19 @@ SQL;
 
     public function testBatchInsertWithYield()
     {
-        include __DIR__ . '/testBatchInsertWithYield.php';
+        $rows = call_user_func(function () {
+            if (false) {
+                yield [];
+            }
+        });
+
+        $command = $this->getConnection()->createCommand();
+        $command->batchInsert(
+            '{{customer}}',
+            ['email', 'name', 'address'],
+            $rows
+        );
+        $this->assertEquals(0, $command->execute());
     }
 
     /**

tests/framework/db/testBatchInsertWithYield.php

@@ -1,22 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-/* @var $this \yiiunit\framework\db\CommandTest  */
-
-$rows = call_user_func(function () {
-    if (false) {
-        yield [];
-    }
-});
-
-$command = $this->getConnection()->createCommand();
-$command->batchInsert(
-    '{{customer}}',
-    ['email', 'name', 'address'],
-    $rows
-);
-$this->assertEquals(0, $command->execute());