Test failing: Proper way to test a POST submission

Controller:

 public function create($channel, Request $request)
{
    $thread = new Thread;
    $thread->channel = $channel;
    $thread->body = $request->body;
    $thread->save();

    $threads = Thread::latest()->where('channel', $channel)->get(); 
    return view($channel, compact('threads'));

}

Test:

public function test_a_user_submit_a_thread()
{
    $thread = factory('App\Thread')->make();
    $this->post('/'.$thread->channel, $thread->toArray());
    $this->get('/.'.$thread->channel)
        ->assertSee($thread->body);
}

The post works on the site when a user submits, however the test is failing

Error:

Failed asserting that
HTML>>>>>>>
contains "Aut provident libero nihil ab corporis distinctio. Repudiandae culpa consectetur at similique sed 
beatae. Autem quasi velit rerum maxime commodi est animi.".