public void Mix_FindBestPrice_ReturnsMinPrice()
{
// arrange
var barsProvider = Substitute.For <IBarsProvider>();
barsProvider.FindCocktailId("mojito").Returns(cocktailId);
barsProvider.FindPrices(cocktailId).Returns(new[] { 100m, 200m });
var service = new CocktailService(barsProvider);
// act
decimal?result = service.FindBestPrice("mojito", null);
// assert
Assert.Equal(100m, result.Value);
}
