@Test
  public void testRequestAccessToken() {
    final TwitterAuthToken token = new TwitterAuthToken("token", "secret");
    final String verifier = "verifier";
    service.api =
        new MockOAuth1aService() {
          @Override
          public void getAccessToken(
              @Header(AuthHeaders.HEADER_AUTHORIZATION) String auth,
              @Query(OAuthConstants.PARAM_VERIFIER) String innerVerifier,
              @Body String dummy,
              Callback<Response> cb) {

            assertEquals(verifier, innerVerifier);
            assertNotNull(auth);
            assertTrue(auth.contains(token.token));
          }
        };
    service.requestAccessToken(null, token, verifier);
  }