@Override
  public UrlPattern doGetPattern() {
    return UrlPattern.create(CALLBACK_PATH + "saml");
  }
@Test
  public void do_get_pattern() {
    assertThat(underTest.doGetPattern().matches("/oauth2/callback/saml")).isTrue();
    assertThat(underTest.doGetPattern().matches("/oauth2/callback/")).isFalse();
    assertThat(underTest.doGetPattern().matches("/oauth2/callback/test")).isFalse();
    assertThat(underTest.doGetPattern().matches("/oauth2/")).isFalse();
  }