public void SimpleAbcValid()
        {
            RegExpEnforcer enforcer = new RegExpEnforcer();
            enforcer.Regex = new Regex("abc");

            string input = "abc";

            Assert.IsEmpty(enforcer.Check(input));
        }
        public void InvalidInputType()
        {
            RegExpEnforcer enforcer = new RegExpEnforcer();

            enforcer.Regex = new Regex("");

            try
            {
                enforcer.Check(34);

                Assert.Fail("An ArgumentException should have been thrown");
            }

            catch (ArgumentException)
            {
            }
        }