Mocking
Mocks replace real dependencies with controlled fakes. PHPUnit's createMock() generates an implementation from an interface or class.
PHP
Intermediate
4 min read
Mocking with PHPUnit
Example
class OrderServiceTest extends TestCase {
public function test_sends_confirmation_email(): void {
$mailer = $this->createMock(Mailer::class);
$mailer->expects($this->once())
->method("send")
->with($this->equalTo("user@example.com"));
$service = new OrderService($mailer);
$service->place(new Order(["email" => "user@example.com"]));
}
} Pro Tip
Inject dependencies via constructor to make classes mockable — avoid static calls in testable code.