Move integration tests to separate directory

Again, we do all of this to prepare for creating "real" test suites for
each type of tests.

tests/integration/api/Controller/ShowDiscussionControllerTest.php

@@ -0,0 +1,86 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Tests\integration\api\Controller;
+
+use Flarum\Api\Controller\ShowDiscussionController;
+use Flarum\Discussion\Discussion;
+use Flarum\Tests\integration\ManagesContent;
+
+class ShowDiscussionControllerTest extends ApiControllerTestCase
+{
+    use ManagesContent;
+
+    protected $controller = ShowDiscussionController::class;
+
+    /**
+     * @var Discussion
+     */
+    protected $discussion;
+
+    protected function init()
+    {
+        $this->discussion = Discussion::start(__CLASS__, $this->getNormalUser());
+    }
+
+    /**
+     * @test
+     */
+    public function author_can_see_discussion()
+    {
+        $this->discussion->save();
+
+        $this->actor = $this->getNormalUser();
+
+        $response = $this->callWith([], ['id' => $this->discussion->id]);
+
+        $this->assertEquals(200, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     * @expectedException \Illuminate\Database\Eloquent\ModelNotFoundException
+     */
+    public function guest_cannot_see_empty_discussion()
+    {
+        $this->discussion->save();
+
+        $response = $this->callWith([], ['id' => $this->discussion->id]);
+
+        $this->assertEquals(200, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function guest_can_see_discussion()
+    {
+        $this->discussion->save();
+
+        $this->addPostByNormalUser();
+
+        $response = $this->callWith([], ['id' => $this->discussion->id]);
+
+        $this->assertEquals(200, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     * @expectedException \Illuminate\Database\Eloquent\ModelNotFoundException
+     */
+    public function guests_cannot_see_private_discussion()
+    {
+        $this->discussion->is_private = true;
+        $this->discussion->save();
+
+        $this->callWith([], ['id' => $this->discussion->id]);
+    }
+}