PHPUnit issues on example Feature Test

    /** @test */
    public function anyone_can_see_our_home_page()
    {
        //wtf
        $response = $this->get('/');
        $response->assertStatus(200);
    }

//gives me

There was 1 failure:

1) Tests\Feature\ServicesTest::anyone_can_see_our_home_page
Expected status code 200 but received 500.
Failed asserting that false is true.

I've obviously got a homepage. I don't know why this example test is not passing. I can view it in the browser with zero errors. Can I please get some help with where to go from here? I feel like these tests should be making this process easier, however I see literally no benefit yet. My php_errors.log has nothing new in it. I've used

php artisan cache:clear
composer dump-autoload

in hopes it'd help, but still nothing..

Thanks in advance for any pointers!