设置方法以返回作为参数传递的函数的返回值

Question

I have:

public T MethodNameHere<T>(Func<T> func)
{
  return func.Invoke();
}

How do I setup a mock for that method. Something along the lines of:

this.mockService.Setup(a => a.MethodNameHere(It.IsAny<Func<Guid>>())).Returns(...?...);

How do I Returns whatever the Func has returned?

Answer 1

Get the passed argument in the Returns delegate and invoke that

this.mockService
    .Setup(_ => _.MethodNameHere(It.IsAny<Func<Guid>>()))
    .Returns((Func<Guid> func) => func());

Or

this.mockService
    .Setup(_ => _.MethodNameHere(It.IsAny<Func<Guid>>()))
    .Returns((Func<Guid> func) => func.Invoke());

Reference Moq Quickstart

// access invocation arguments when returning a value
mock.Setup(x => x.DoSomethingStringy(It.IsAny<string>()))
        .Returns((string s) => s.ToLower());
// Multiple parameters overloads available