@Test
public void testIsValid() {

    CheckDigitVerifier verifier = CheckDigitVerifiers.getVerifier(LuhnMod10);
    assertTrue(verifier.isValid("79927398713"));
    assertTrue(verifier.isValid("49927398716"));
    assertFalse(verifier.isValid("49927398717"));
    assertTrue(verifier.isValid("1234567812345670"));
    assertFalse(verifier.isValid("1234567812345678"));
    assertFalse(verifier.isValid("294217778"));
}