NSubstitute & Mock Implementasyonu

July 17, 2017

Hali hazırda yürütmekte olduğumuz projenin testlerini yazarken polonyalı meslektaşım mocking için NSubstitute kullandıklarını söyledi. Hali hazırda çok ilerlememiş olduğumuz için projenin testlerini Nsubstitute’ e taşıdık. Başlarda biraz soğuk gelse de zamanla ısındım ve doğal dile daha yakın ifadeler içerdiğini gördüm. Kötü yanı dokümantasyonu çok açıklayıcı değil ancak çok fazla ihtiyaç duymuyorsunuz. Strategy pattern/Proxy implementasyonunu nasıl test edeceğimize dair küçük bir örnek yaptım.

Fikir vermesi için testleri burada paylaşıyorum.

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public class CommunicationTests
{
    [Test]
    public void PassMessageWithoutModify()
    {
        var message = new Message() { };
        var result = new MessageResult() { StatusCode = StatusCode.OK };

        var mockSuccessListener = Substitute.For<IListener<MessageResult>>();
        var mockFailureListener = Substitute.For<IListener<MessageResult>>();
        var mockSender = Substitute.For<ISendingStrategy>();
        mockSender.Send(message).Returns(result);

        var target = new Context(mockSender, mockSuccessListener, mockFailureListener);
        target.Process(message);

        mockSender.Received(1).Send(message);
    }
    [Test]
    public void RedirectToSuccessListener()
    {
        var message = new Message() { };
        var result = new MessageResult() { StatusCode = StatusCode.OK };

        var mockSuccessListener = Substitute.For<IListener<MessageResult>>();
        var mockFailureListener = Substitute.For<IListener<MessageResult>>();
        var mockSender = Substitute.For<ISendingStrategy>();
        mockSender.Send(message).Returns(result);

        var target = new Context(mockSender, mockSuccessListener, mockFailureListener);
        target.Process(message);

        mockSuccessListener.Received(1).Handle(result);
    }
    [Test]
    public void RedirectToFailureListener()
    {
        var message = new Message() { };
        var result = new MessageResult() { StatusCode = StatusCode.TIMEOUT };

        var mockSuccessListener = Substitute.For<IListener<MessageResult>>();
        var mockFailureListener = Substitute.For<IListener<MessageResult>>();
        var mockSender = Substitute.For<ISendingStrategy>();
        mockSender.Send(message).Returns(result);

        var target = new Context(mockSender, mockSuccessListener, mockFailureListener);
        target.Process(message);

        mockFailureListener.Received(1).Handle(result);
    }
}
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