如何断言是否已经使用nunit调用了方法 [英] how to assert if a method has been called using nunit

问题描述

是否可以断言是否已调用方法?我正在测试以下方法，并且想断言_tokenManager.GetToken()已被调用.我只想知道该方法是否已被调用，因为该方法不返回值.我正在使用起订量.

is it possible to assert whether a method has been called? I'm testing the following method and I want to assert that the _tokenManager.GetToken() has been called. I just want to know if the method has been called as the method does not return a value. I am using Moq.

谢谢

代码段

public void Subscribe(string code, string emailAddress, string columnKey)
{
    // Request authentication token
    var token = _tokenManager.GetToken(code, false);

    if (!_tokenValidator.Validate(token))
    {
        // Token has expired or invalid - refresh the token 
        token = _tokenManager.GetToken(code, true);
    }

    // Subscribe email
    _silverpopRepository.Subscribe(token.AccessToken, emailAddress, columnKey);
}

推荐答案

您应该模拟TokenManager和TokenValidator，然后创建两个单元测试用例:

You should mock TokenManager and TokenValidator, and then create two unit test cases:

• 情况1:令牌已验证，并且GetToken恰好被调用一次
• 情况2:令牌未通过验证，并且GetToken被精确调用了两次

• Case 1: token is validated and GetToken is called exactly once
• Case 2: token is not validated and GetToken is called exactly twice

情况1:

[Test]
public void Subscribe_TokenIsValidated_GetTokenIsCalledOnce()
{
    // Arrange:
    var tokenManagerMock = Mock.Of<TokenManager>();

    var tokenValidatorMock = Mock.Of<TokenValidator>(x =>
        x.Validate(It.IsAny<Token>()) == true);

    var subscriber = new Subscriber
    {
        TokenManager = tokenManagerMock,
        TokenValidator = tokenValidatorMock
    };

    // Act:
    subscriber.Subscribe(It.IsAny<string>(), It.IsAny<string>(),
        It.IsAny<string>());

    // Assert:
    Mock.Get(tokenManagerMock).Verify(x =>
        x.GetToken(It.IsAny<string>(), It.IsAny<bool>()), Times.Once);
}

情况2:

[Test]
public void Subscribe_TokenIsExpiredOrInvalid_GetTokenIsCalledTwice()
{
    // Arrange:
    var tokenManagerMock = Mock.Of<TokenManager>();

    var tokenValidatorMock = Mock.Of<TokenValidator>(x =>
        x.Validate(It.IsAny<Token>()) == false);

    var subscriber = new Subscriber
    {
        TokenManager = tokenManagerMock,
        TokenValidator = tokenValidatorMock
    };

    // Act:
    subscriber.Subscribe(It.IsAny<string>(), It.IsAny<string>(),
        It.IsAny<string>());

    // Assert:
    Mock.Get(tokenManagerMock).Verify(x =>
        x.GetToken(It.IsAny<string>(), It.IsAny<bool>()), Times.Exactly(2));
}

---

或者，您可以在不模拟TokenValidator的情况下创建单元测试，并验证是否至少调用过一次GetToken().但是，最好像在第一个示例中那样创建两种情况，因为我们正在测试所有代码路径.

---

Alternatively, you can create an unit test without mocking TokenValidator and verify if GetToken() has been called at least once. However, creating two cases as in the first example is preferred as we are testing all code paths.

// Arrange:
var tokenManagerMock = Mock.Of<TokenManager>();
var subscriber = new Subscriber {TokenManager = tokenManagerMock};

// Act:
subscriber.Subscribe(It.IsAny<string>(),
    It.IsAny<string>(),
    It.IsAny<string>());

// Assert:
Mock.Get(tokenManagerMock).Verify(x =>
        x.GetToken(It.IsAny<string>(), It.IsAny<bool>()), Times.AtLeastOnce);

---

通过以下网址了解有关Moq中验证的更多信息:

---

Read more about verification in Moq at:

• Moq快速入门在官方网站上
• 在BlackWasp上验证对模拟方法的调用次数

• Moq quick start at official website
• Verifying the Number of Calls to a Mocked Method at BlackWasp

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