diff --git a/tests/ApiTest.php b/tests/ApiTest.php
index 8b963501..c70a023c 100644
--- a/tests/ApiTest.php
+++ b/tests/ApiTest.php
@@ -34,9 +34,17 @@ class ApiTest extends TestCase
             ->assertStatus(200)
             ->assertJson(['icao' => $airport->icao], true);
 
+        $this->withHeaders(['authorization' => 'testadminapikey'])->get($uri)
+            ->assertStatus(200)
+            ->assertJson(['icao' => $airport->icao], true);
+
         $this->withHeaders(['AUTHORIZATION' => 'testadminapikey'])->get($uri)
             ->assertStatus(200)
             ->assertJson(['icao' => $airport->icao], true);
+
+        $this->withHeaders(['AuThOrIzAtIoN' => 'testadminapikey'])->get($uri)
+            ->assertStatus(200)
+            ->assertJson(['icao' => $airport->icao], true);
     }
 
     /**