public void Verify_Source_Is_Registered_On_Registration()
        {
            var registry = new NewsSourceRegistry <NewsSource>();
            var source   = registry.Register("source1");

            Assert.True(registry.IsRegistered("source1"));
            Assert.True(registry.IsRegistered(source.Id));
        }
        public void Verify_Source_Is_Unregistered_Before_Registration()
        {
            var registry = new NewsSourceRegistry <NewsSource>();

            Assert.True(!registry.IsRegistered("source1"));
        }