public void PostsToTheCorrectUrl() { var connection = Substitute.For<IApiConnection>(); var client = new GistsClient(connection); var newGist = new NewGist(); newGist.Description = "my new gist"; newGist.Public = true; newGist.Files.Add("myGistTestFile.cs", "new GistsClient(connection).Create();"); client.Create(newGist); connection.Received().Post<Gist>(Arg.Is<Uri>(u => u.ToString() == "gists"), Arg.Any<object>()); }