Mockery

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL). Designed as a drop in alternative to PHPUnit's phpunit-mock-objects library, Mockery is easy to integrate with PHPUnit and can operate alongside phpunit-mock-objects without the World ending.

Mockery is released under a New BSD License.

Installation

To install Mockery, run the command below and you will get the latest version

composer require --dev mockery/mockery

⚠️️ The remainder of this README refers specifically to the master branch (1.0-dev).

Test Doubles

Test doubles (often called mocks) simulate the behaviour of real objects. They are commonly utilised to offer test isolation, to stand in for objects which do not yet exist, or to allow for the exploratory design of class APIs without requiring actual implementation up front.

The benefits of a test double framework are to allow for the flexible generation and configuration of test doubles. They allow the setting of expected method calls and/or return values using a flexible API which is capable of capturing every possible real object behaviour in way that is stated as close as possible to a natural language description. Use the Mockery::mock method to create a test double.

$double = Mockery::mock();

If you need Mockery to create a test double to satisfy a particular type hint, you can pass the type to the mock method.

class Book {}

interface BookRepository {
    function find($id): Book;
    function findAll(): array;
    function add(Book $book): void;
}

$double = Mockery::mock(BookRepository::class);

Method Stubs 🎫

A method stub is a mechanism for having your test double return canned responses to certain method calls. With stubs, you don't care how many times, if at all, the method is called. Stubs are used to provide indirect input to the system under test.

$double->allows()->find(123)->andReturns(new Book());

$book = $double->find(123);

If your stub doesn't require specific arguments, you can also use this shortcut for setting up multiple calls at once:

$double->allows([
    "findAll" => [new Book(), new Book()], 
]);

You can also use this shortcut, which creates a double and sets up some stubs in one call:

$double = Mockery::mock(BookRepository::class, [
    "findAll" => [new Book(), new Book()], 
]);

Method Call Expectations 📲

A Method call expectation is a mechanism to allow you to verify that a particular method has been called. You can specify the parameters and you can also specify how many times you expect it to be called. Method call expectations are used to verify indirect output of the system under test.

$book = new Book();

$double = Mockery::mock(BookRepository::class);
$double->expects()->add($book);

During the test, Mockery accept calls to the add method as prescribed. After you have finished exercising the system under test, you need to tell Mockery to check that the method was called as expected, using the Mockery::close method. One way to do that is to add it to your tearDown method in PHPUnit.

public function tearDown()
{
    Mockery::close();
}

The expects() method automatically sets up an expectation that the method call (and matching parameters) is called once and once only. You can choose to change this if you are expecting more calls.

$double->expects()->add($book)->twice();

Test Spies 🕵️

By default, all test doubles created with the Mockery::mock method will only accept calls that they have been configured to allow or expect. Sometimes we don't necessarily care about all of the calls that are going to be made to an object. To facilitate this, we can tell Mockery to ignore any calls it has not been told to expect or allow. To do so, we can tell a test double shouldIgnoreMissing, or we can create the double using the Mocker::spy shortcut.

// $double = Mockery::mock()->shouldIgnoreMissing();
$double = Mockery::spy(); 

$double->foo(); // null
$double->bar(); // null

Further to this, sometimes we want to have the object accept any call during the test execution and then verify the calls afterwards. For these purposes, we need our test double to act as a Spy. All mockery test doubles record the calls that are made to them for verification afterwards by default:

$double->baz(123);

$double->shouldHaveReceived()->baz(123); // null
$double->shouldHaveReceived()->baz(12345); // Uncaught Exception Mockery\Exception\InvalidCountException...

Utilities 🔌

Testing Traits

As Mockery ships with code generation capabilities, it was trivial to add functionality allowing users to create objects on the fly that use particular traits. Any abstract methods defined by the trait will be created and can have expectations or stubs configured like normal Test Doubles.

trait Foo {
    function foo() {
        return $this->doFoo();
    }

    abstract function doFoo();
}

$double = Mockery::mock(Foo::class);
$double->allows()->doFoo()->andReturns(123);
$double->foo(); // int(123)

Documentation

The current version can be seen at docs.mockery.io.