public void DoInvalidFail()
        {
            Assert.NotNull(EmailSamples.Invalid);
            Assert.NotEmpty(EmailSamples.Invalid);

            foreach (var invalidEmail in EmailSamples.Invalid.Concat(EmailSamples.Incomplete))
            {
                Assert.False(IsBizMail.IsValid(invalidEmail), $"{invalidEmail} is invalid");
            }
        }
        public void DoValidPassValidation()
        {
            Assert.NotNull(EmailSamples.Business);
            Assert.NotEmpty(EmailSamples.Business);

            foreach (var businessEmail in EmailSamples.Business)
            {
                Assert.True(IsBizMail.IsValid(businessEmail), $"{businessEmail} is not free (business)");
            }
        }