Trinity of test example 1

TrinityTestExample1.cs

[Theory, AutoMoqData]
public void Should_Throw_On_Invalid_Email([Frozen] Mock<IProductRepo> productRepo,
    Product product, Customer customer, TransactionService testTransactionService)
{
    customer.Email = "Not an email address";
    productRepo.setup(repo => repo.GetProduct(It.Is<int>(product.id)).Returns(product);
    Assert.Throws(() => testTransactionService.Sell(product.Id,customer));
}