}
        };

        URL url = new URL("http://custom.protocol/path");

        // Configure the mock factory to return our handler for the 'http' protocol.
        when(mockFactory.createURLStreamHandler("http")).thenReturn(mockStreamHandler);

        Handler.setURLStreamHandlerFactory(mockFactory);

        URLConnection connection = handler.openConnection(url);

            if (handler != null) {
                return handler;
            }
            if (factory != null) {
                handler = factory.createURLStreamHandler(protocol);
            }
            if (handler == null) {
                final String path = System.getProperty(HANDLER_PKGS_PROPERTY);

            if (handler != null) {
                return handler;
            }
            if (factory != null) {
                handler = factory.createURLStreamHandler(protocol);
            }
            if (handler == null) {
                final String path = System.getProperty(HANDLER_PKGS_PROPERTY);