@Test(expected = IllegalArgumentException.class)
 public void shouldThrowExceptionIfForEmptyStrings() {
   extractor.extract("");
 }
 @Test(expected = OAuthException.class)
 public void shouldThrowExceptionIfForNoMatch() {
   extractor.extract("These Are Not The Droids You're Looking For");
 }
 @Test(expected = IllegalArgumentException.class)
 public void shouldThrowExceptionIfForNullParameters() {
   extractor.extract(null);
 }
 @Test
 public void shouldParseResponse() {
   Token token = extractor.extract(response);
   assertEquals(token.getToken(), "I0122HHJKLEM21F3WLPYHDKGKZULAUO4SGMV3ABKFTDT3T3X");
 }