public void ProductName_TooLong()
{
//Arrange
var currentProduct = new Product();
currentProduct.ProductName = "Steel Bladed Hand Saw";
string expected = null;
string expectedMessage = "Product Name cannot be more than 20 characters";
//Act
var actual = currentProduct.ProductName;
var actualMessage = currentProduct.ValidationMessage;
//Assert
Assert.AreEqual(expected, actual);
Assert.AreEqual(expectedMessage, actualMessage);
}