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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"])); } }
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