public void ReturnsOneHandlers()
        {
            var command = new Command1();
            var handler = new TestHandlersLookup().Handler(command);

            Assert.Single(handler);
        }
        public void ReturnsTwoHandlers()
        {
            var command = new Command2();
            var handler = new TestHandlersLookup().Handler(command);

            Assert.Equal(2, handler.Count());
        }
        public void ReturnsZeroHandlers()
        {
            var command = new Command0();
            var handler = new TestHandlersLookup().Handler(command);

            Assert.Empty(handler);
        }