What steps will reproduce the problem? The following test:

[TestMethod] public void Can_mock_complex_interface_recursively() { var repository = new MockRepository(MockBehavior.Loose) {DefaultValue = DefaultValue.Mock}; var mock = repository.Create<IParent>(); mock.SetupGet(r => r.Child.Value).Returns(1); }

public interface IParent { IChild Child { get; set; } }

public interface IChild { int Value { get; set; } IChild Child { get; set; } }

What is the expected output? What do you see instead? Expected green result. Instead the test never completes.

What version of the product are you using? On what operating system? Moq v4.0.10827.0 Windows 7

Please provide any additional information below. This appears to be a bug in MockRepository, because it only fails when DefaultValue for the repository is set to DefaultValue.Mock.

As a workaround, don't use DefaultValue.Mock and it will all be just fine.

Based on the documentation for what MockBehavior.Loose will do, your current setup will return a null value for mock.Child instead of a mock instance. You need to explicitly set that up. To fix this:

1. Create a Mock and setup mock.Child to return that mock.

var mockChild = repository.Create(); mock.SetupGet(r => r.Child).Returns(mockChild);

2. Setup the Mock, "mockChild", to have the Value property setup to return the target value.

mockChild.SetupGet(c => c.Value).Returns(1);