public void UrlValidatorTests()
        {
            Assert.IsTrue(ValidUrlAttribute.ValidHttpURL("https://www.google.com/"));
            Assert.IsTrue(ValidUrlAttribute.ValidHttpURL("http://www.google.com/"));

            Assert.IsTrue(ValidUrlAttribute.ValidHttpURL("https://google.com/"));
            Assert.IsTrue(ValidUrlAttribute.ValidHttpURL("http://google.com/"));

            Assert.IsTrue(ValidUrlAttribute.ValidHttpURL("https://google.com"));
            Assert.IsTrue(ValidUrlAttribute.ValidHttpURL("http://google.com"));

            Assert.IsFalse(ValidUrlAttribute.ValidHttpURL(""));
        }
        public void ValidUrlAttribute_ShouldNotValidateUrlStrings(string url, bool expected)
        {
            var validUrlAttribute = new ValidUrlAttribute();

            Assert.Equal(expected, validUrlAttribute.IsValid(url));
        }