How can I create a polymophic relation factory so that I can use it on my phpunit tests?

I have articles table and comments table. comments table includes commentable_id commentable_type and body. I tried the code below on my testcase which doesn't seem right. With this one I cannot create multiple comments.

/** @test */
    public function an_authenticated_user_can_comment_a_post(){

        $user = $this->signIn();

        $article = factory('App\Article')->create();

        $this->post("article/{$article->slug}/comment", [
            'comment' => $this->faker->sentence,
        ]);

        $this->assertCount(1, $article->comments);

    }

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