public void FindMostExpensiveProductsShouldReturnNullIfCollectionIsEmpty()
{
var newProducts = new ProductStock();
var result = newProducts.FindMostExpensiveProduct();
Assert.AreEqual(result, null);
}
public void ProductStock_FindMostExpensiveProductReturnsCorrectValue()
{
var stock = new ProductStock();
stock.Add(new Product("SSD", 12.4m, 3));
stock.Add(new Product("CPU", 16.5m, 3));
stock.Add(new Product("HDD", 20.7m, 3));
stock.Add(new Product("RAM", 14.9m, 3));
var result = stock.FindMostExpensiveProduct();
Assert.AreEqual(result.CompareTo(new Product("HDD", 20.7m, 3)), 0);
}
public void FindMostExpensiveProducts_ReturnsProductsWithHighestPrice()
{
var price = 1.2m;
for (int i = 0; i < 3; i++)
{
var product = new Product($"{i}", price * (i + 1), 1);
productStock.Add(product);
}
for (int i = 3; i > 0; i--)
{
var product = new Product($"{i}m", price * (i + 7), i);
productStock.Add(product);
}
var mostExpensive = productStock.FindMostExpensiveProduct();
var expected = new Product("3m", 10 * price, 3);
Assert.AreEqual(expected.Price, mostExpensive.Price);
Assert.AreEqual(expected.Label, mostExpensive.Label);
Assert.AreEqual(expected.Quantity, mostExpensive.Quantity);
}
public void ProductStock_FindMostExpensiveProductThrowsExceptionWhenThereAreNoProducts()
{
var stock = new ProductStock();
Assert.Throws <InvalidOperationException>(() => stock.FindMostExpensiveProduct());
}
public void FindMostExpensiveProduct_WhenCollectionIsEmptySHouldThrowInvalidOperationException()
{
Assert.Throws <InvalidOperationException>(() => productStock.FindMostExpensiveProduct());
}
