Make integration tests independent

This creates a dedicated test suite for integration tests. All of them
can be run independently, and there is no order dependency - previously,
all integration tests needed the installer test to run first, and they
would fail if installation failed.

Now, the developer will have to set up a Flarum database to be used by
these tests. A setup script to make this simple will be added in the
next commit.

Small tradeoff: the installer is NOT tested in our test suite anymore,
only implicitly through the setup script. If we decide that this is a
problem, we can still set up separate, dedicated installer tests which
should probably test the web installer.

tests/integration/api/Auth/AuthenticateWithApiKeyTest.php

@@ -13,9 +13,12 @@ namespace Flarum\Tests\integration\api\Auth;
 
 use Carbon\Carbon;
 use Flarum\Api\ApiKey;
+use Flarum\Api\Client;
 use Flarum\Api\Controller\CreateGroupController;
 use Flarum\Tests\integration\RetrievesAuthorizedUsers;
 use Flarum\Tests\integration\TestCase;
+use Flarum\User\Guest;
+use Flarum\User\User;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\MiddlewareInterface;
@@ -28,6 +31,18 @@ class AuthenticateWithApiKeyTest extends TestCase
 {
     use RetrievesAuthorizedUsers;
 
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->prepareDatabase([
+            'users' => [
+                $this->adminUser(),
+                $this->normalUser(),
+            ],
+        ]);
+    }
+
     protected function key(int $user_id = null): ApiKey
     {
         return ApiKey::unguarded(function () use ($user_id) {
@@ -45,9 +60,11 @@ class AuthenticateWithApiKeyTest extends TestCase
      */
     public function cannot_authorize_without_key()
     {
-        $this->call(
-            CreateGroupController::class
-        );
+        /** @var Client $api */
+        $api = $this->app()->getContainer()->make(Client::class);
+        $api->setErrorHandler(null);
+
+        $api->send(CreateGroupController::class, new Guest);
     }
 
     /**
@@ -79,7 +96,7 @@ class AuthenticateWithApiKeyTest extends TestCase
      */
     public function personal_api_token_cannot_authenticate_as_anyone()
     {
-        $user = $this->getNormalUser();
+        $user = User::find(2);
 
         $key = $this->key($user->id);
 
@@ -105,7 +122,7 @@ class AuthenticateWithApiKeyTest extends TestCase
      */
     public function personal_api_token_authenticates_user()
     {
-        $user = $this->getNormalUser();
+        $user = User::find(2);
 
         $key = $this->key($user->id);