Testing IObservable processing

gistfile1.cs

  public class ExampleTest
    {
        private readonly List<KeyPress> outputs;
        private readonly KeyProvider provider;
        private readonly Subject<InterceptKeyEventArgs> subject;
        private IProcessLookup processLookup;

        public ExampleTest()
        {
            outputs = new List<KeyPress>();
            subject = new Subject<InterceptKeyEventArgs>();
            processLookup = Substitute.For<IProcessLookup>();
            provider = new KeyProvider(subject, processLookup);
            provider.Subscribe(outputs.Add);
        }

        [Fact]
        public void this_is_how_to_write_a_carnac_test()
        {
            var keys = new List<InterceptKeyEventArgs>
                           {
                               new InterceptKeyEventArgs(Keys.LControlKey, KeyDirection.Down, false, false, false),
                               new InterceptKeyEventArgs(Keys.LShiftKey, KeyDirection.Down, false, true, false),
                               new InterceptKeyEventArgs(Keys.L, KeyDirection.Down, false, true, true),
                               new InterceptKeyEventArgs(Keys.L, KeyDirection.Up, false, true, true),
                               new InterceptKeyEventArgs(Keys.LShiftKey, KeyDirection.Up, false, true, true),
                               new InterceptKeyEventArgs(Keys.LControlKey, KeyDirection.Up, false, true, false)
                           };

            foreach (var key in keys)
            {
                subject.OnNext(key);
            }

            Assert.True(outputs.Count == 6); // we're not actually testing anything here, right? ShellViewModel is the bits you want to test.
        }
    }