断言某个方法仅被调用一次

我想断言一个方法只被调用一次。我正在使用 RhinoMocks 3.5。

这是我认为可行的：

[Test]
public void just_once()
{
    var key = "id_of_something";

    var source = MockRepository.GenerateStub<ISomeDataSource>();
    source.Expect(x => x.GetSomethingThatTakesALotOfResources(key))
        .Return(new Something())
        .Repeat.Once();

    var client = new Client(soure);

    // the first call I expect the client to use the source
    client.GetMeMyThing(key);

    // the second call the result should be cached
    // and source is not used
    client.GetMeMyThing(key);
}

如果第二次调用，我希望此测试失败GetMeMyThing() calls source.GetSomethingThatTakesALotOfResources().

这是我验证方法被调用一次的方法。

[Test]
public void just_once()
{
    // Arrange (Important to GenerateMock not GenerateStub)
    var a = MockRepository.GenerateMock<ISomeDataSource>();
    a.Expect(x => x.GetSomethingThatTakesALotOfResources()).Return(new Something()).Repeat.Once();

    // Act
    // First invocation should call GetSomethingThatTakesALotOfResources
    a.GetMeMyThing();

    // Second invocation should return cached result
    a.GetMeMyThing();

    // Assert
    a.VerifyAllExpectations();
}