public void Test_CallBack()
{
var prod1 = new Product(1, "prod1", 10);
var stock = new Stock();
string testString = "";
stock.AddProducts(prod1);
void TestMethod(Product product, int quantity)
{
testString = $"{product.Name} has only " + $"{quantity} pieces left.";
}
stock.AddCallbackAction(TestMethod);
stock.Buy(prod1, 1);
Assert.Equal("prod1 has only 9 pieces left.", testString);
}
public void Test_CallBack_MultipleBuysOnlyOneCallback()
{
var prod1 = new Product(1, "prod1", 10);
var stock = new Stock();
string testString = "";
stock.AddProducts(prod1);
void TestMethod(Product product, int quantity)
{
testString = $"{product.Name} has only " + $"{quantity} pieces left.";
}
stock.AddCallbackAction(TestMethod);
stock.Buy(prod1, 1);
Assert.Equal("prod1 has only 9 pieces left.", testString);
Assert.Equal(9, stock.GetProductQuantity(prod1));
stock.Buy(prod1, 2);
Assert.Equal(7, stock.GetProductQuantity(prod1));
Assert.Equal("prod1 has only 9 pieces left.", testString);
stock.Buy(prod1, 2);
Assert.Equal(5, stock.GetProductQuantity(prod1));
Assert.Equal("prod1 has only 9 pieces left.", testString);
stock.Buy(prod1, 2);
Assert.Equal(3, stock.GetProductQuantity(prod1));
Assert.Equal("prod1 has only 3 pieces left.", testString);
stock.Buy(prod1, 2);
Assert.Equal(1, stock.GetProductQuantity(prod1));
Assert.Equal("prod1 has only 1 pieces left.", testString);
}