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readme.md

File:	`readme.md`
Role:	Documentation
Content type:	`text/markdown`
Description:	Documentation
Class:	Doubles Create mock objects by doubling a given class
Author:	By Alexandre
Last change:
Date:	5 years ago
Size:	`3,458 bytes`

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SitPHP/Doubles

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The "sitphp/doubles" library can help you to test your PHP classes by generating doubles that look like the original classes but can be manipulated and tested (sort of a copy of a class). These doubles then can then be used instead of the original classes for your test. This library can create doubles of any kind of class, interface or trait.

See full documentation : here

Installation

Add the line "sitphp/doubles": "2.2.*" in the "require-dev" section of your composer.json file :

{
    "require-dev": {
        "sitphp/doubles": "2.2.*"
    }
}

And run the following command :

composer update

This will install the latest version of the "sitphp/doubles" library with the required PhpUnit package.

Creating a double

A double is called a "dummy" when all the methods of the original class are overwritten to return null. To get a "dummy" double instance, use the dummy method :

// Get a double instance of type "dummy" for class "MyClass"
$my_double = Double::dummy(MyClass::class)->getInstance();

A double is called a "mock" when all the methods of the original class are overwritten to behave the same as in the original class. To get a "mock" double instance, use the mock method :

// Get a double instance of type "mock" for class "MyClass"
$my_double = Double::mock(MyClass::class)->getInstance();

For more details : Read the doc on creating doubles

Testing a double

To test how many times a double method is called, use the count method :

// Test that the method "myMethod" is called a least one time
$double::_method('myMethod')->count('>=1');

To test the values of the arguments passed to a double method, use the args method :

// Test that the arguments passed to method "myMethod" are "value1" and "value2"
$double::_method('myMethod')->args(['value1', 'value2']);

To change the return value of a method, use the stub method. :

// Make method "myMethod" return "hello"
$my_double::_method('myMethod')->return('hello');

For more details : Read the doc on testing doubles

Configuration

You define the configuration for a specific double using the 2nd argument of the dummy and mock methods :</p>

// Get double instance with config
$my_double = Double::dummy(MyClass::class, [
    'allow_final_doubles' => true,
    'allow_non_existent_classes' => true
])->getInstance();

Here is a list of all available config parameters :

`allow_final_doubles` : Set this parameter to `false` to stop trying to make doubles of final classes/methods.
`allow_protected_methods` : Set this parameter to `false` to disallow testing protected methods.
`allow_non_existent_classes` : Set this parameter to `false` to disallow alias doubles of non existent classes.
`test_unexpected_methods` : Set this parameter to `true` to automatically receive an assertion error whenever an unexpected method is called.

For more details : Read the doc on configuration