Recursive Mocks Sample

gistfile1.cs

    public interface IMapper
    {
        IMapperLink From<TInput>(TInput input);
    }
    
    public interface IMapperLink
    {
        TOutput To<TOutput>();
    }

    [Test]
    public void BeforeRhinoMocksRecursiveMocks()
    {
        var mapper = MockRepository.GenerateMock<IMapper>();
        var mapperLink = MockRepository.GenerateMock<IMapperLink>();
        
        mapper.Expect(mock => mock.From(5)).Return(mapperLink);
        mapperLink.Expect(mock => mock.To<string>()).Return("Test");

        var result = mapper.From(5).To<string>();
        Assert.That(result, Is.EqualTo("Test"));
    }

    [Test]
    public void UsingRhinoMocksRecursiveMocks()
    {
        var mapper = MockRepository.GenerateMock<IMapper>();
        mapper.Expect(mock => mock.From(5).To<string>()).Return("Test");

        var result = mapper.From(5).To<string>();
        Assert.That(result, Is.EqualTo("Test"));
    }

    [Test]
    public void UsingNSubstituteRecursiveMocks()
    {
        var mapper = Substitute.For<IMapper>();
        mapper.From(5).To<string>().Returns("Test");

        var result = mapper.From(5).To<string>();
        Assert.That(result, Is.EqualTo("Test"));
    }
    
    [Test]
    public void UsingNSubstituteWithMultipleRecursiveMocks()
    {
        var mapper = Substitute.For<IConverterApi>();
        mapper.From(5).To<string>().Returns("Test");
        mapper.From("Seven").To<double>().Returns(7.0);

        var firstResult = mapper.From(5).To<string>();
        Assert.That(firstResult, Is.EqualTo("Test"));

        var secondResult = mapper.From("Seven").To<double>();
        Assert.That(secondResult, Is.EqualTo(7.0));
    }
        
    [Test]
    public void UsingRhinoMocksWithMultipleRecursiveMocks()
    {
        var mapper = MockRepository.GenerateMock<IConverterApi>();
        mapper.Expect(mock => mock.From(5).To<string>()).Return("Test");

        // This test fails here.
        mapper.Expect(mock => mock.From("Seven").To<double>()).Return(7.0);

        var firstResult = mapper.From(5).To<string>();
        Assert.That(firstResult, Is.EqualTo("Test"));

        var secondResult = mapper.From("Seven").To<double>();
        Assert.That(secondResult, Is.EqualTo(7.0));
    }