如何在phpunit测试中断言Flash消息的内容？

Question

Any idea on how i can test CakePHP controller flash message content in phpunit testing? I need to test this:

if ($var == "yes") {
   //do something
} else {         
   $this->Flash->error(__('Invalid username or password, try again;));
}

Answer 1

According to the documentation , if you are using version 3.4.7 or later, you can use the enableRetainFlashMessages() function before issuing your get/post/whatever. Then you can check for the existence of the flash message by using assertSession().

Example:

$this->enableRetainFlashMessages();
$this->get('call-your-public-controller-function-here');
$this->assertSession('Invalid username or password, try again', 'Flash.flash.0.message');

I stated "according to the documentation" because I'm actually using an older version right now (3.1.13) that does not include that method, so I have not personally tested the code above.

HOWEVER... I have found that, with the version I'm using, I can basically do the same thing without issuing the enableRetainFlashMessages() call. By using assertSession(), I can check for the existence of the expected message using the process described above. I had assumed that it would not work, but it did! (That never happens...)