public void GivenAddableProductItem_WhenAddCalledWithNullProductItem_ThenThrowsArgumentNullException()
{
// Arrange
IAddableProductItem addableProductItem = new AddableProductItem(Mock.Of <IProductItem>());
// Act, Assert
Assert.Throws <ArgumentNullException>(() => addableProductItem.Add(null));
}
public void GivenAddableProductItem_WhenAddCalledWithInvalidProductItem_ThenThrowsArgumentException()
{
// Arrange
var productItemToAddTo = new Mock <IProductItem>();
productItemToAddTo.Setup(pi => pi.Name).Returns("Some product name");
IAddableProductItem addableProductItem = new AddableProductItem(productItemToAddTo.Object);
var productItemToAdd = new Mock <IProductItem>();
productItemToAdd.Setup(pi => pi.Name).Returns("Different product name");
// Act, Assert
Assert.Throws <ArgumentException>(() => addableProductItem.Add(productItemToAdd.Object));
}
public void GivenAddableProductItem_WhenAddCalledWithValidProductItem_ThenReturnsCombinedQuantity()
{
// Arrange
var productItemToAddTo = new Mock <IProductItem>();
productItemToAddTo.Setup(pi => pi.Name).Returns("product name");
productItemToAddTo.Setup(pi => pi.Quantity).Returns(10);
IAddableProductItem addableProductItem = new AddableProductItem(productItemToAddTo.Object);
var productItemToAdd = new Mock <IProductItem>();
productItemToAdd.Setup(pi => pi.Name).Returns("product name");
productItemToAdd.Setup(pi => pi.Quantity).Returns(7);
// Act, Assert
addableProductItem.Add(productItemToAdd.Object);
// Assert
Assert.That(addableProductItem.Quantity, Is.EqualTo(17));
}