public void GetByMail_Flow_User()
{
var mail = "*****@*****.**";
var users = new List <User> {
new User {
Mail = mail
}
}.AsQueryable();
var mockSet = MockHelper.MockDbSet(users);
var result = UserExtension.GetByMail(mockSet.Object, mail);
Assert.AreEqual(mail, result.Mail);
}