Mock Get 覆盖方法使另一个测试在 xUnit.NET 中失败

Question

我有两个使用 xUnit 框架的测试：

private IRepo myRepo;

public MyTests() { myRepo = Mock.Of<IRepo>(); ... }

[Fact]
public async void NoTenantTest()
{
  var validJson = GetValidJson();
  Mock.Get(myRepo).Setup(t => t.FindByIdAsync(It.IsAny<string>())).Returns(Task.FromResult(null as MyObject));
  var request = TestFactory.CreateHttpRequest(new Dictionary<string, string> { { "tenant", "abc" } }, "https://test.com", validJson);
  var ex = await Assert.ThrowsAsync<Exception>(() => myAzureFunc.Run(request, mLog, mCtx));
  Assert.Equal("FindByIdAsync(abc) returned null", ex.Message, true);
}

[Fact]
public async void NoCompanyTest()
{
  var validJson = GetValidJson();
  Mock.Get(myRepo).Setup(t => t.FindByIdAsync(It.IsAny<string>())).Returns(Task.FromResult(new MyObject()));

 ...
 Mock.Get(myManager).Setup(w => w.GetIdAsync(It.IsAny<MyObject>()).Returns(Task.FromResult(null as string));

  var request = TestFactory.CreateHttpRequest(new Dictionary<string, string> { { "tenant", "abc" } }, "https://test.com", validJson);
  var ex = await Assert.ThrowsAsync<Exception>(() => mPaymentWebhook.Run(request, mLog, mCtx));
  Assert.Equal("No item found for abc", ex.Message, true);
}

xUnit 似乎按字母顺序执行测试。不知何故，来自 Mock.Get(myRepo) 的 Setup 未被覆盖，然后 NoTenantTest 失败（我收到另一条错误消息）

如何创建 IRepo 对象的新实例以避免我的情况？

如果我单独执行测试，它会工作，如果我运行全部，然后失败。

Answer 1

在单独的测试方法中创建它们（模拟），而不是作为在构造函数中初始化的共享资源。

此外，如果测试是异步的，请使用 async Task 而不是 async void

[Fact]
public async Task NoTenantTest() {
    var validJson = GetValidJson();
    IRepo myRepo = Mock.Of<IRepo>();
    Mock.Get(myRepo)
        .Setup(t => t.FindByIdAsync(It.IsAny<string>()))
        .Returns(Task.FromResult(null as MyObject));
    var request = TestFactory.CreateHttpRequest(new Dictionary<string, string> { { "tenant", "abc" } }, "https://test.com", validJson);
    var ex = await Assert.ThrowsAsync<Exception>(() => myAzureFunc.Run(request, mLog, mCtx));
    Assert.Equal("FindByIdAsync(abc) returned null", ex.Message, true);
}

[Fact]
public async Task NoCompanyTest() {
    var validJson = GetValidJson();
    IRepo myRepo = Mock.Of<IRepo>();
    Mock.Get(myRepo)
        .Setup(t => t.FindByIdAsync(It.IsAny<string>()))
        .Returns(Task.FromResult(new MyObject()));

    ...
    Mock.Get(myManager)
        .Setup(w => w.GetIdAsync(It.IsAny<MyObject>())
        .Returns(Task.FromResult(null as string));

    var request = TestFactory.CreateHttpRequest(new Dictionary<string, string> { { "tenant", "abc" } }, "https://test.com", validJson);
    var ex = await Assert.ThrowsAsync<Exception>(() => mPaymentWebhook.Run(request, mLog, mCtx));
    Assert.Equal("No item found for abc", ex.Message, true);
}

Mock Get 覆盖方法使另一个测试在 xUnit.NET 中失败

Mock Get override method make another test fail in xUnit.NET

moq

xunit.net