Adding an empty permissions edge case

Permissions/PermissionManager.php

@@ -41,6 +41,9 @@ class PermissionManager
      */
     public function clean($permissions)
     {
+        if (!$permissions) {
+            return [];
+        }
         $cleanedPermissions = [];
         foreach ($permissions as $permissionName => $checkedPermission) {
             $cleanedPermissions[$permissionName] = (bool)$checkedPermission;

Tests/PermissionManagerTest.php

@@ -82,4 +82,16 @@ class PermissionManagerTest extends \TestCase
 
         $this->assertEquals($expected, $cleanedPermissions);
     }
+
+    /** @test */
+    public function itShouldReturnEmptyArrayIfNoRolesAreSupplied()
+    {
+        $request = [];
+
+        $expected = [];
+
+        $cleanedPermissions = $this->permissions->clean($request);
+
+        $this->assertEquals($expected, $cleanedPermissions);
+    }
 }