public async Task RegistrationShouldSucceed()
{
Product product = await TestOperations.CreateProductAndPublish(_fixture.Context);
string email = RandomData.Email();
string username = RandomData.RandomString();
string password = RandomData.RandomString(12, true);
UserRegistration operation = new UserRegistration(_fixture.Context, product.Id, email, username, password);
await operation.Do();
await operation.CommitAsync();
}