### Question:
JWKSourceDataProvider { public static JWKSourceDataProvider getInstance() { return jwkSourceDataProvider; } private  JWKSourceDataProvider(); static JWKSourceDataProvider getInstance(); RemoteJWKSet<SecurityContext> getJWKSource(String jwksUri); Map<String, RemoteJWKSet<SecurityContext>> getJwkSourceMap(); void refreshJWKSResource(String jwksUri);  }### Answer:
@Test public void testGetInstance() throws Exception { Assert.assertTrue(JWKSourceDataProvider.getInstance() instanceof JWKSourceDataProvider); }