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Example code of lucatume/function-mocker-le

Informations about the package function-mocker-le

Function Mocker, Light Edition

When function-mocker is overkill.

Code example

Installation

Use Composer to require the library in the project

Why mocking functions? What problem does this solve?

The library provides a lightweight and dependency-free function mocking solution.
The reason one might want to mock a function in the tests is to test any code that depends on a framework based on functions (e.g. WordPress).
The difference between this library and function-mocker is that this will only work when none of the function it defines are defined during the execution; function-mocker will allow instead monkey-patching the functions at runtime even if those are already defined.
Where function mocker depends on the Patchwork library to allow for user-land monkey-patching this library has a minimal code footprint and only provides a handful of functions.
Patchwork or function-mocker should be used if really loading the mocked functions source cannot be avoided in the tests.

Usage

The library core function is the define($function, $callback) one: it defines a function and sets its content to a callback; in its basic usage it allows setting up a mocked function return value in the tests:

The $callback argument can be a callable of any kind, in this example I'm using the Prophecy mocking engine to use set complex expectations:

Relying on basic assertions provided by hte PhpUnit library is another option:

Where function-mocker tries to provide a feature-reach solution to the problem of mocking functions (and more); this project tries to provide just a basic starting point with no opinionated choices about its usage.
The other functions provided by the libary are just sugar wrappers around the define core; see the example and the /tests folder for clarity.
The undefine($function) and undefineAll() methods will "undefine" functions managed by the Function Mocker LE library; in this context "undefine" means that calling the undefined function will trhow an tad\FunctionMockerLe\UndefinedFunctionException.

Tests

To run the tests install the composer dependencies and run PHPUnit:

All versions of function-mocker-le with dependencies

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Requires php Version >=5.4
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