### Question:
JWKSourceDataProvider { public RemoteJWKSet<SecurityContext> getJWKSource(String jwksUri) throws MalformedURLException { RemoteJWKSet<SecurityContext> jwkSet = jwkSourceMap.get(jwksUri); if (jwkSet == null) { jwkSet = retrieveJWKSFromJWKSEndpoint(jwksUri); jwkSourceMap.put(jwksUri, jwkSet); } return jwkSet; } private  JWKSourceDataProvider(); static JWKSourceDataProvider getInstance(); RemoteJWKSet<SecurityContext> getJWKSource(String jwksUri); Map<String, RemoteJWKSet<SecurityContext>> getJwkSourceMap(); void refreshJWKSResource(String jwksUri);  }### Answer:
@Test public void testGetJWKSource() throws Exception { Map<String, RemoteJWKSet<SecurityContext>> jwkSourceMap = JWKSourceDataProvider.getInstance().getJwkSourceMap(); Assert.assertTrue(jwkSourceMap.size() > 0); }