public void GivenConfirmedUserWhenGetUserByIdThenUserIsFound(string providerName)
{
// arrange
var testClass = this.WithProvider(providerName);
var testUser = testClass.WithConfirmedUser().Value;
var membershipUser = testClass.GetUser(testUser.UserName, false);
// act
var user = testClass.GetUser(membershipUser.ProviderUserKey, false);
// assert
Assert.That(user, Is.Not.Null);
Assert.That(user.UserName, Is.EqualTo(testUser.UserName));
}