public void FilteredDrinksContainsResultsWithAnyIngredientMatch()
        {
            var expected = new LocalDrink( "1", "", new[] {
                new Ingredient( "a", Measurement.Tsp, 1 ),
                new Ingredient( "b", Measurement.Tsp, 2 )
            } );
            recipes.Add( expected );

            var results = recipes.WithIngredients( "b", "c" );

            Assert.IsTrue( expected.Equals( results.Single() ) );
        }