First issue

[jsk95]

SourceMock/Tests/ArgumentTests.cs

Lines 44 to 51 in c4016d7

	[Fact]
	public void SingleArgument_Optional() {
	var mock = Mock.Of<IMockable>().Get();
	mock.Setup.ParseToInt32().Returns(1);
	Assert.Equal(1, mock.ParseToInt32("x"));
	}

Is the design of the library so that you don't have to specify the shape of the arguments if you don't care?
What happens in the test when the interface has a no param ParseToInt32?