How to mock objects in PHPUnit tests?

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by samara , in category: PHP General , 9 months ago

How to mock objects in PHPUnit tests?

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1 answer

by mallory_cormier , 8 months ago

@samara 

To mock objects in PHPUnit tests, you can follow these steps:

  1. Install PHPUnit: PHPUnit is a testing framework for PHP that provides built-in support for mocking objects. You can install it using Composer by adding the following dependency to your project's composer.json file: "require-dev": { "phpunit/phpunit": "^9.0" } Then run composer update to install PHPUnit.
  2. Create a mock object: In your test case, you can create a mock object using the getMockBuilder method provided by PHPUnit. Here's an example: use PHPUnitFrameworkTestCase; class MyTest extends TestCase { public function testMockObject() { $mock = $this->getMockBuilder(MyClass::class) ->setMethods(['someMethod']) // Specify the methods to be mocked ->getMock(); // Use $mock to set expectations and assertions } }
  3. Set expectations: You can use methods like $mock->expects($this->once())->method('someMethod') to set expectations on the mock object. This means that the someMethod should be called only once in the test.
  4. Define return values or behaviors: You can use methods like $mock->method('someMethod')->willReturn('mocked result') to define the return value of a method or $mock->method('someMethod')->will($this->throwException(new Exception())) to specify that the method should throw an exception.
  5. Use the mock object in your test: Finally, you can use the mock object within your test to assert that the expected behavior or interactions occurred. public function testMockObject() { $mock = $this->getMockBuilder(MyClass::class) ->setMethods(['someMethod']) ->getMock(); $mock->expects($this->once()) ->method('someMethod') ->willReturn('mocked result'); // Use $mock to assert that the expected behavior occurred }


These are the basic steps to mock objects in PHPUnit tests. You can find more information and advanced features in the official PHPUnit documentation: https://phpunit.de/documentation.html