I had a unit tests which constructed a pack uri, and I didn’t want to abstract it (needless abstraction) so here is how I solved a few issues.

Exception 1

System.UriFormatException : Invalid URI: Invalid port specified

This one is pretty easy to fix, you can use the PackUriHelper which registers a few things in it’s static ctor

PackUriHelper.Create(new Uri("reliable://0"))

Exception 2

System.NotSupportedException : The URI prefix is not recognized

This one is fixed by giving WPF the default resource assembly.

System.Windows.Application.ResourceAssembly = typeof(App).Assembly;

Now you should be able to unit tests around pack uri’s