Moq是一个匿名类型的函数

我正试图嘲笑这种方法

Task GetResultAsync(Func transformFunc) 

像这样

 iMock.Setup(m => m.GetResultAsync(It.IsAny<Func>())).ReturnsAsync(new { isPair = false }); 

测试执行调用的方法将匿名类型传递给generics参数，如下所示

 instance.GetResultAsync(u => new {isPair = u == "something" }) //dont look at the function return because as generic could have diferent implementations in many case 

Moq永远不会将我的GetResultAsync方法与发送的参数匹配。

我正在使用Moq 4

Answer 1

匿名类型会给你带来麻烦。 你需要一个具体的类型才能工作。

以下示例在我更改时起作用

 instance.GetResultAsync(u => new {isPair = u == "something" }) 

至

 instance.GetResultAsync(u => (object) new {isPair = u == "something" }) 

Moq无法匹配匿名类型，这就是调用时得到null原因。

 [TestClass] public class MoqUnitTest { [TestMethod] public async Task Moq_Function_With_Anonymous_Type() { //Arrange var expected = new { isPair = false }; var iMock = new Mock(); iMock.Setup(m => m.GetResultAsync(It.IsAny>())) .ReturnsAsync(expected); var consumer = new Consumer(iMock.Object); //Act var actual = await consumer.Act(); //Assert Assert.AreEqual(expected, actual); } public interface IService { Task GetResultAsync(Func transformFunc); } public class Consumer { private IService instance; public Consumer(IService service) { this.instance = service; } public async Task 

如果调用GetResultAsync的代码依赖于使用匿名类型，那么您尝试对测试执行的操作将无法使用当前设置。 您可能需要为该方法提供具体类型。

 [TestClass] public class MoqUnitTest { [TestMethod] public async Task Moq_Function_With_Concrete_Type() { //Arrange var expected = new ConcreteType { isPair = false }; var iMock = new Mock(); iMock.Setup(m => m.GetResultAsync(It.IsAny>())) .ReturnsAsync(expected); var sut = new SystemUnderTest(iMock.Object); //Act var actual = await sut.MethodUnderTest(); //Assert Assert.AreEqual(expected, actual); } class ConcreteType { public bool isPair { get; set; } } public interface IService { Task GetResultAsync(Func transformFunc); } public class SystemUnderTest { private IService instance; public SystemUnderTest(IService service) { this.instance = service; } public async Task