public void Invalid_Username()
            {
                bool attemptedPassword = PasswordValidator.Validate("invalidUsername", "password1");

                Assert.That(attemptedPassword, Is.False);
            }
            public void Invalid_Password_Attempt_With_Varying_Casing()
            {
                bool attemptedPassword = PasswordValidator.Validate("validUser", "PaSSword");

                Assert.That(attemptedPassword, Is.False);
            }
            public void Valid_Password_And_Username()
            {
                bool attemptedPassword = PasswordValidator.Validate("validUser", "password");

                Assert.That(attemptedPassword, Is.True);
            }