NSubstitute不会替换方法

Question

我有我的测试目标类：

public class ApiClient
{

    private IRestClient authz_rest_client;
    private IRestClient api_rest_client;


    // Injection feature for testing
    internal ApiClient(IRestClient authz_rest_client, IRestClient api_rest_client)
    {
        this.authz_rest_client = authz_rest_client;
        this.api_rest_client = api_rest_client;
    }
    //...

因此，我按如下方式注入被替换的RestSharp客户端：

[TestFixture]
class AuthzApiClientTests
{

    private ApiClient api_client;

    private IRestClient authz_rest_client;
    private IRestClient api_rest_client;

    private IRestRequest request;
    private IRestResponse<OAuth2AuthzCodeResponse> response;

    [SetUp]
    public void SetUp()
    {
        this.authz_rest_client = NSubstitute.Substitute.For<IRestClient>();
        this.api_rest_client = NSubstitute.Substitute.For<IRestClient>();

        this.request = NSubstitute.Substitute.For<IRestRequest>();
        this.response = NSubstitute.Substitute.For<IRestResponse<OAuth2AuthzCodeResponse>>();

        this.authz_rest_client.Execute<OAuth2AuthzCodeResponse>(request).Returns(response);

        this.api_client = new ApiClient(this.authz_rest_client, this.api_rest_client);
        this.api_client.configure(
            "client_id",
            "user",
            "passwd"
        );
    }

然后，我编写了一个测试：

    [Test]
    public void Should_ReturnCorrectRequestTokenServiceEndpoint()
    {

        response.StatusCode = HttpStatusCode.Unauthorized;
        response.Data = new OAuth2AuthzCodeResponse()
        {
            Error = StringEnum.GetStringValue(OAuth2ErrorTypes.invalid_client)  //CLIENT IS NOT REGISTERED ON LEST SYSTEM.
        };

        this.api_client.Invoking(c => c.GrantAuthorization())
            .ShouldThrow<OAuth2APIException>();
    }

如您所见，我想测试ApiClient类的GrantAuthorization方法。此方法为：

IRestRequest authzcode_request = new AuthzCodeRequest(
            this.settings.AuthzAuthorizeEndpoint,
            this.settings.ClientId,
            this.settings.ClientSecret,
            this.settings.User,
            this.settings.Password
        );

        IRestResponse<OAuth2AuthzCodeResponse> authzcode_response = this.authz_rest_client.Execute<OAuth2AuthzCodeResponse>(authzcode_request);
        this.check_response(authzcode_response);

        this.settings.AuthzCode = authzcode_response.Data.Code;
        this.settings.AuthzCodeExpirationThreshold = DateTime.Now.AddSeconds(authzcode_response.Data.Expires_in);

我测试的目标是“捕获”我的Execute<OAuth2AuthzCodeResponse>方法，以便返回被替换的响应。

问题是，当我执行测试并在这一行停止时，结果不是我之前设置的响应。

Answer 1

我在完成整个示例时遇到了问题，但我确实注意到了SetUp使用的一些东西：

request = Substitute.For<IRestRequest>();
response = Substitute.For<IRestResponse<OAuth2AuthzCodeResponse>>();
authz_rest_client.Execute<OAuth2AuthzCodeResponse>(request).Returns(response);

这里的第三行说明，每当使用request实例调用authz_rest_client.Execute<OAuth2AuthzCodeResponse>()时，它都将返回response。但是request似乎从来没有在代码中的任何地方使用过，所以Execute实际上永远不会返回那个response。

对于任何对Execute<OAuth2AuthzCodeResponse>()的调用，类似于下面这行代码将返回response

authz_rest_client.Execute<OAuth2AuthzCodeResponse>(null).ReturnsForAnyArgs(response);

但我也不确定这就是你想要的？相反，您可能希望清除单个调用，例如当它获得类型为AuthzCodeRequest的请求时的特定响应。

Answer 2

解决了！

我试着这样做：

this.authz_rest_client.Execute<OAuth2AuthzCodeResponse>(Arg.Any<IRestRequest>()).Returns(response);

此解决方案类似于前面的答案方法。

然而，我不明白为什么不永久地工作。