public async Task AddProductAsync_ShouldFail_WhenCartIsNull()
{
// Arrange
_fixture.Behaviors.Add(new OmitOnRecursionBehavior());
var quantity = _fixture.Create <int>();
var cart = _fixture.Create <Cart>();
var product = _fixture.Create <Product>();
var expectedException = new KeyNotFoundException($"{typeof(Cart)} with id {cart.Id} was not found");
_productRepository.GetAsync(product.Id).Returns(product);
// Act
var result = await Assert.ThrowsAsync <KeyNotFoundException>(async() => await _sut.AddProductAsync(cart.Id, product.Id, quantity));
// Assert
Assert.Equal(expectedException.Message, result.Message);
}
