diff --git a/tests/Http/Controllers/GitHubGateControllerTest.php b/tests/Http/Controllers/GitHubGateControllerTest.php
index 86265de..14b5c7a 100644
--- a/tests/Http/Controllers/GitHubGateControllerTest.php
+++ b/tests/Http/Controllers/GitHubGateControllerTest.php
@@ -1,59 +1,95 @@
 <?php
 
 namespace Nasqueron\Notifications\Tests\Http\Controllers;
 
 use Nasqueron\Notifications\Tests\TestCase;
 
 class GitHubGateControllerTest extends TestCase {
     public function setUp () {
         parent::setUp();
 
         $this->disableEvents();
     }
 
     /**
      * GitHub gate works.
      *
      * @return void
      */
     public function testGet () {
         $this->visit('/gate/GitHub')
              ->see('POST');
     }
 
     /**
      * Tests a GitHub gate payload.
      */
     public function testPost () {
         $payload = file_get_contents(__DIR__ . '/../../data/payloads/GitHubPingPayload.json');
         $this->sendPayload(
             '/gate/GitHub/Quux', // A gate not existing in data/credentials.json
             $payload,
             'POST',
             [
                 'X-Github-Event' => 'ping',
                 'X-Github-Delivery' => 'e5dd9fc7-17ac-11e5-9427-73dad6b9b17c'
             ]
         )
         ->seeJson([
             'gate' => 'GitHub',
             'door' => 'Quux',
             'actions' => []
         ]);
 
         $this->assertResponseOk();
     }
 
     /**
      * Tests a malformed GitHub gate payload.
      */
     public function testMalformedPost () {
         $this->sendPayload(
             '/gate/GitHub/Quux', // A gate not existing in data/credentials.json
             "",
             'POST',
-            []
+            [
+                'X-Github-Delivery' => 'e5dd9fc7-17ac-11e5-9427-73dad6b9b17c',
+            ]
+        );
+        $this->assertResponseStatus(400);
+
+        $this->sendPayload(
+            '/gate/GitHub/Quux', // A gate not existing in data/credentials.json
+            "",
+            'POST',
+            [
+                'X-Github-Event' => 'ping',
+            ]
         );
         $this->assertResponseStatus(400);
+
+        $this->sendPayload(
+            '/gate/GitHub/Quux', // A gate not existing in data/credentials.json
+            "",
+            'POST',
+            [
+                'X-Github-Delivery' => 'e5dd9fc7-17ac-11e5-9427-73dad6b9b17c',
+                'X-Github-Event' => 'ping',
+            ]
+        );
+        $this->assertResponseStatus(400);
+    }
+
+    public function testEmptySignature () {
+        $this->sendPayload(
+            '/gate/GitHub/Acme', // A gate existing in data/credentials.json
+            "",
+            'POST',
+            [
+                'X-Github-Event' => 'ping',
+                'X-Github-Delivery' => 'e5dd9fc7-17ac-11e5-9427-73dad6b9b17c',
+            ]
+        );
+        $this->assertResponseStatus(403);
     }
 }