Fix: Simplify test bootstrapping

composer.json

@@ -28,6 +28,11 @@
             "Whoops\\": "src/Whoops/"
         }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "Whoops\\": "tests/Whoops/"
+        }
+    },
     "extra": {
         "branch-alias": {
             "dev-master": "2.0-dev"

tests/bootstrap.php

@@ -6,8 +6,5 @@
  * Bootstraper for PHPUnit tests.
  */
 error_reporting(E_ALL | E_STRICT);
-// Can be required more than once to allow running
-// phpunit installed with Composer
-// http://stackoverflow.com/a/12798022
-$loader = require __DIR__ . '/../vendor/autoload.php';
-$loader->add('Whoops\\', __DIR__);
+
+require_once __DIR__ . '/../vendor/autoload.php';