public void GivenUnregisteredUserWhenGetUserThenMembershipUserIsNull(string providerName)
{
// arrange
var testClass = this.WithProvider(providerName);
var testUser = testClass.WithUnregisteredUser().Value;
// act
var user = testClass.GetUser(testUser.UserName, false);
// assert
Assert.That(user, Is.Null);
}