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()
        {
            //Imagine provider is a KeyTokeniser
            var matches = Drain(provider, ()=>CtrlShiftL());
 
            Assert.Equal("Ctrl + Shift + L", matches.Single().ToString()); 
            Assert.True(matches.Single().IsShortcut); 
            Assert.True("Locate File in Solution", matches.Single().ShortcutDescription); 
        }

        public void CtrlShiftL()
        {
             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)
                           };

            Push(keys);
        }

        public void Push(IEnumerable<InterceptKeyEventArgs> keys)
        {
            foreach (var key in keys)
            {
                subject.OnNext(key);
            }
        }
    }