[TestMethod] public void IsValidHairColor_n123abz() => Assert.IsFalse(Passport.IsValidHairColor("#123abz"));
[TestMethod] public void IsValidHairColor_123abc() => Assert.IsFalse(Passport.IsValidHairColor("123abc"));
[TestMethod] public void IsValidHairColor_n123abc() => Assert.IsTrue(Passport.IsValidHairColor("#123abc"));