diff --git a/tests/User/UserPreferencesTest.php b/tests/User/UserPreferencesTest.php
index 03dad7990..c8f4d2754 100644
--- a/tests/User/UserPreferencesTest.php
+++ b/tests/User/UserPreferencesTest.php
@@ -191,4 +191,22 @@ class UserPreferencesTest extends TestCase
         $resp = $this->get($page->getUrl('/edit'));
         $resp->assertSee('option:code-editor:favourites="javascript,ruby"', false);
     }
+
+    public function test_update_boolean()
+    {
+        $editor = $this->getEditor();
+
+        $this->assertTrue(setting()->getUser($editor, 'md-show-preview'));
+
+        $resp = $this->actingAs($editor)->patch('/preferences/update-boolean', ['name' => 'md-show-preview', 'value' => 'false']);
+        $resp->assertStatus(204);
+
+        $this->assertFalse(setting()->getUser($editor, 'md-show-preview'));
+    }
+
+    public function test_update_boolean_rejects_unfamiliar_key()
+    {
+        $resp = $this->asEditor()->patch('/preferences/update-boolean', ['name' => 'md-donkey-show', 'value' => 'false']);
+        $resp->assertStatus(500);
+    }
 }