public void TestBuilder()
{
IBuilder builder = new ConcreteBuilder();
builder.BuildPartOne("Part 1");
builder.BuildPartTwo("Part 2");
builder.BuildPartThree("Part 3");
var product = builder.GetProduct();
Assert.AreEqual(product.PartOne, "Part 1");
Assert.AreEqual(product.PartTwo, "Part 2");
Assert.AreEqual(product.PartThree, "Part 3");
}