diff --git a/extensions/mentions/tests/integration/api/CreateDiscussionTest.php b/extensions/mentions/tests/integration/api/CreateDiscussionTest.php
new file mode 100644
index 0000000000..703de08c0f
--- /dev/null
+++ b/extensions/mentions/tests/integration/api/CreateDiscussionTest.php
@@ -0,0 +1,104 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Mentions\Tests\integration\api;
+
+use Flarum\Discussion\Discussion;
+use Flarum\Extend;
+use Flarum\Testing\integration\TestCase;
+use Illuminate\Support\Arr;
+
+class CreateDiscussionTest extends TestCase
+{
+    /**
+     * @inheritDoc
+     */
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->extension('flarum-mentions');
+
+        $this->extend(
+            (new Extend\Event())
+            ->listen(\Flarum\Post\Event\Saving::class, function ($event) {
+                $event->post->content;
+            })
+        );
+    }
+
+    /**
+     * @test
+     */
+    public function cannot_create_discussion_without_content_property()
+    {
+        $response = $this->send(
+            $this->request('POST', '/api/discussions', [
+                'authenticatedAs' => 1,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'title' => 'Test post',
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(422, $response->getStatusCode());
+
+        $body = (string) $response->getBody();
+        $this->assertJson($body);
+        $this->assertEquals([
+            'errors' => [
+                [
+                    'status' => '422',
+                    'code' => 'validation_error',
+                    'detail' => 'The content field is required.',
+                    'source' => ['pointer' => '/data/attributes/content'],
+                ],
+            ],
+        ], json_decode($body, true));
+    }
+
+    /**
+     * @test
+     */
+    public function cannot_create_discussion_with_content_set_to_null()
+    {
+        $response = $this->send(
+            $this->request('POST', '/api/discussions', [
+                'authenticatedAs' => 1,
+                'json' => [
+                    'data' => [
+                        'attributes' => [
+                            'title' => 'Test post',
+                            'content' => null,
+                        ],
+                    ],
+                ],
+            ])
+        );
+
+        $this->assertEquals(422, $response->getStatusCode());
+
+        $body = (string) $response->getBody();
+        $this->assertJson($body);
+        $this->assertEquals([
+            'errors' => [
+                [
+                    'status' => '422',
+                    'code' => 'validation_error',
+                    'detail' => 'The content field is required.',
+                    'source' => ['pointer' => '/data/attributes/content'],
+                ],
+            ],
+        ], json_decode($body, true));
+    }
+}
diff --git a/framework/core/tests/integration/api/discussions/CreateTest.php b/framework/core/tests/integration/api/discussions/CreateTest.php
index f04a454b49..ac5141570b 100644
--- a/framework/core/tests/integration/api/discussions/CreateTest.php
+++ b/framework/core/tests/integration/api/discussions/CreateTest.php
@@ -69,97 +69,6 @@ public function cannot_create_discussion_without_content()
         ], json_decode($body, true));
     }
 
-    /**
-     * @test
-     */
-    public function cannot_create_discussion_without_content_property()
-    {
-        $this->extend(
-            (new Extend\Formatter)
-                ->unparse(function ($context, string $content) {
-                    return $content;
-                }),
-            (new Extend\Event())
-                ->listen(\Flarum\Post\Event\Saving::class, function ($event) {
-                    $event->post->content;
-                })
-        );
-
-        $response = $this->send(
-            $this->request('POST', '/api/discussions', [
-                'authenticatedAs' => 1,
-                'json' => [
-                    'data' => [
-                        'attributes' => [
-                            'title' => 'Test post',
-                        ],
-                    ],
-                ],
-            ])
-        );
-
-        $this->assertEquals(422, $response->getStatusCode());
-
-        $body = (string) $response->getBody();
-        $this->assertJson($body);
-        $this->assertEquals([
-            'errors' => [
-                [
-                    'status' => '422',
-                    'code' => 'validation_error',
-                    'detail' => 'The content field is required.',
-                    'source' => ['pointer' => '/data/attributes/content'],
-                ],
-            ],
-        ], json_decode($body, true));
-    }
-
-    /**
-     * @test
-     */
-    public function cannot_create_discussion_with_content_set_to_null()
-    {
-        $this->extend(
-            (new Extend\Formatter)
-                ->unparse(function ($context, string $content) {
-                    return $content;
-                }),
-            (new Extend\Event())
-                ->listen(\Flarum\Post\Event\Saving::class, function ($event) {
-                    $event->post->content;
-                })
-        );
-
-        $response = $this->send(
-            $this->request('POST', '/api/discussions', [
-                'authenticatedAs' => 1,
-                'json' => [
-                    'data' => [
-                        'attributes' => [
-                            'title' => 'Test post',
-                            'content' => null,
-                        ],
-                    ],
-                ],
-            ])
-        );
-
-        $this->assertEquals(422, $response->getStatusCode());
-
-        $body = (string) $response->getBody();
-        $this->assertJson($body);
-        $this->assertEquals([
-            'errors' => [
-                [
-                    'status' => '422',
-                    'code' => 'validation_error',
-                    'detail' => 'The content field is required.',
-                    'source' => ['pointer' => '/data/attributes/content'],
-                ],
-            ],
-        ], json_decode($body, true));
-    }
-
     /**
      * @test
      */