Laravel Route Authentication: "Route [login] not defined"?

Hi,

I'm developing software in Laravel and Passport that uses OAuth2 authentication with Canvas. It's to authenticate users, admins and non-users and see if they've permission to access a page.

However, when I try to make a request on this route, I get the following error message:

    Symfony\Component\Routing\Exception\RouteNotFoundException: Route [login] not defined.

I don't understand why. Nowhere in my code do I call a "login" route, anywhere. Could anyone please offer some clarity on the subject? I'd be most grateful.

If it's of any use, here is my code in laravel for the route request:

    Route::get('/testClient', ['as' => 'testClient', 'uses' => function(Request $request) {
       $http = new GuzzleHttp\Client;
       $response = $http->post('https://my.test.instructure.com/login/oauth2/auth?client_id=9&response_type=code&redirect_uri=http://www.google.com', [
          'form_params' => [
             'grant_type' => 'authorization_code',
             'client_id' => 9,
             'client_secret' => 'my_secret',
             'redirect_uri' => 'www.google.com',
          ],
       ]);
       return json_decode((string) $response->getBody(), true)['access_token'];
    }])->middleware('client');