### Question:
LinkedInApi20 extends DefaultApi20 { @Override public AccessTokenExtractor getAccessTokenExtractor() { return new JsonTokenExtractor(); } LinkedInApi20();  LinkedInApi20(String state); @Override OAuthService createService(OAuthConfig config); @Override String getAccessTokenEndpoint(); @Override AccessTokenExtractor getAccessTokenExtractor(); Verb getAccessTokenVerb(); @Override String getAuthorizationUrl(OAuthConfig config); String getState();  }### Answer:
@Test public void testExtractorIsCorrectType() { assertTrue(new LinkedInApi20().getAccessTokenExtractor() instanceof JsonTokenExtractor); }