Just a little Moq demonstration

MockGist.cs

using Moq;
using Xunit;

namespace GithubGists
{
    public class MockGist
    {
        [Fact]
        public void TestMock()
        {
            // Note this conditional expression...
            var foo = Mock.Of<IFoo>(f => f.Foo == "foo");
            Assert.Equal("foo", foo.Foo);
        }

    }

    public interface IFoo
    {
        string Foo { get; }
    }
}