public void ShouldDetectSecondValidField()
        {
            IValidColumns sut = new ValidColumns(new[] { "A_Correct_Column" });

            Assert.True(sut.IsInvalidColumn("A_Good_Column"));
        }
        public void ShouldDetectAnyFieldIsValid()
        {
            IValidColumns sut = new ValidColumns(new[] { "A_Correct_Column", "A_Great_Column" });

            Assert.False(sut.IsInvalidColumn("A_Great_Column"));
        }
        public void ShouldDetectValidField()
        {
            IValidColumns sut = new ValidColumns(new[] { "A_Good_Column" });

            Assert.False(sut.IsInvalidColumn("A_Good_Column"));
        }