### Question:
OktaLogoutHandler implements AuthenticationHandler { @Override public AuthenticationInfo extractCredentials(HttpServletRequest request, HttpServletResponse response) { return null; }  @Override AuthenticationInfo extractCredentials(HttpServletRequest request, HttpServletResponse response); @Override boolean requestCredentials(HttpServletRequest request, HttpServletResponse response); @Override void dropCredentials(HttpServletRequest request, HttpServletResponse response);  }### Answer:
@Test public void testExtractCredentialsReturnsNull() { assertNull(underTest.extractCredentials(context.request(), context.response())); }