Freek.dev

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Posts tagged with mocking

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Three types of mocks original

by Brent Roose – 3 minute read

Mocking, faking; these might sound like intimidating words if you don't know what they are about, but once you do, you'll be able to improve your testing skills significantly.

Part of "the art of testing" is being able to test code in some level of isolation to make sure a test suite is trustworthy and versatile. These topics are so important that we actually made five or six videos on them in our Testing Laravel course.

In this post, I want to share three ways how you can deal with mocking and faking. Let's dive in!

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Handcrafting mocks original

by Freek Van der Herten – 8 minute read

In an application I was working on I wanted to implement automated tweets. Of course, this logic should also be tested. In this blogpost I'd like to show you how you can easily handcraft your own mocks. Setting things up Let's first take a look at how you can tweet something in PHP. We're going to…

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The Five Types of Test Doubles & How to Create Them in PHPUnit

– jmauerhan.wordpress.com

In a new post on her blog Jessica Mauerhan has some good examples on the various types of test doubles.

Did you know that a Mock is only one type of a test double? Most of us use the word “mock” to mean any kind of test double, but there’s actually five different types. It really can help you understand what you’re trying to accomplish with your test if you know a little bit more what you’re doing with your test doubles, so this article will explain the kinds of test doubles, when you use them, how you use them and why.

Read more [jmauerhan.wordpress.com]

Monkey patching in PHP with Patchwork

Patchwork is a PHP library that allows you to change user defined functions at runtime. This can be incredibly handy when testing. I'm by no means a Ruby expert but I heard that in the Ruby world they do this kind of stuff all the time during testing.

Here's a simple example of what Patchwork can do:

function myCounter($array)
{
    return count($array);
}

myCounter([1, 2]); // returns '2';

//now let's change the function
Patchwork\redefine('myCounter', function($array)
{
    return count($array) ? 'a lot of items' : 'empty';
});

myCounter([1, 2]); // returns 'a lot of items";

Read the implementation docs to learn how this works behind the scenes.

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Writing your own test doubles

Adam Wathan posted another excellent article on testing on his blog. This time he talks about creating test doubles. Adam demonstrates that creating your own fake can result in a much more readable test than using mocks or spies.

You'll learn to create an InMemoryMailer like this:

public function test_new_users_are_sent_a_welcome_email()
{
    $mailer = new InMemoryMailer;
    Mail::swap($mailer);

    $this->post('register', [
        'name' => 'John Doe',
        'email' => 'john@example.com',
        'password' => 'secret',
    ]);

    $this->assertTrue($mailer->hasMessageFor('john@example.com'));
    $this->assertTrue($mailer->hasMessageWithSubject('Welcome to my app!'));
}

That seems like a pretty readable test to me. Read (or view) the whole tutorial here: http://adamwathan.me/2016/01/25/writing-your-own-test-doubles/

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