public void ReturnProductWhenValidParameterIsPassed()
{
//arrange
var database = new Models.Database();
var productMock = new Mock <IProduct>();
int id = 0;
productMock.SetupGet(x => x.ID).Returns(id);
database.AddProduct(productMock.Object);
//act
var result = database.GetProduct(id);
//assert
Assert.AreEqual(id, result.ID);
}