phpunitHow to use dependency injection in PHPUnit?

Dependency injection is a technique used to inject dependencies into a class. It can be used in PHPUnit to inject dependencies into a test class. This allows for better test isolation and makes the tests more maintainable.

Example code

class MyTest extends \PHPUnit\Framework\TestCase
{
    private $dependency;

    public function __construct($dependency)
    {
        $this->dependency = $dependency;
    }

    public function testSomething()
    {
        // Test something with $this->dependency
    }
}

The code above shows an example of how to use dependency injection in PHPUnit. The test class is extended from the PHPUnit TestCase class and a dependency is injected into the constructor. The dependency can then be used in the test method.

Code explanation

• class MyTest extends \PHPUnit\Framework\TestCase: This line extends the test class from the PHPUnit TestCase class.
• public function __construct($dependency): This is the constructor of the test class. It takes a dependency as an argument.
• $this->dependency = $dependency: This line assigns the dependency to a class property.
• public function testSomething(): This is the test method. It can use the dependency to test something.

Helpful links

• PHPUnit Documentation
• Dependency Injection in PHPUnit

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