@Test
public void testIsJwt() {

  assertFalse(GoogleAuth.isJwt("ya29.abcdef"));
  assertFalse(GoogleAuth.isJwt("abcdef.abcdef"));
  assertFalse(GoogleAuth.isJwt("abc.abcdef.abcdef"));
  assertFalse(GoogleAuth.isJwt("abcdef.abc.abcdef"));
  assertFalse(GoogleAuth.isJwt("abcdef.abcdef.abc"));
  assertFalse(GoogleAuth.isJwt("abcdef.abcdef.abcdef.abcdef"));
  assertFalse(GoogleAuth.isJwt("abcdef.abcd*ef.abcdef"));
  assertTrue(GoogleAuth.isJwt("abcdef.abcdef.abcdef"));
}