SpotifyOAuthTokenRefresher extends OAuthTokenRefresher { @Override public String getClientId() { return SpotifyHelper.CLIENT_ID; } SpotifyOAuthTokenRefresher(); @Override String getTokenUrl(); @Override String getClientId(); @Override String getClientSecret();  }
@Test public void test_getClientId() { assertEquals(SpotifyHelper.CLIENT_ID, refresher.getClientId()); }