How can I mock external API during testing in laravel 5?

I want to test an HTTP route in laravel. The action function of the URL calls a helper function, which calls an external API. How can I mock the external API call while testing?

public function actionFunction(){

     $helper = new HelperClassHelper();

     return Response::json($helper->getNames());

}

Here, the getNames() function makes an external API call. How do I mock it?

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