public void PostsToTheCorrectUrl() { var connection = Substitute.For <IApiConnection>(); var client = new GistsClient(connection); var updateGist = new GistUpdate(); updateGist.Description = "my newly updated gist"; var gistFileUpdate = new GistFileUpdate { NewFileName = "myNewGistTestFile.cs", Content = "new GistsClient(connection).Edit();" }; updateGist.Files.Add("myGistTestFile.cs", gistFileUpdate); client.Edit("1", updateGist); connection.Received().Patch <Gist>(Arg.Is <Uri>(u => u.ToString() == "gists/1"), Arg.Any <object>()); }