Merges master.

Author: ryasmi

src/StatementBase.php

@@ -1,4 +1,5 @@
 <?php namespace Locker\XApi;
+use Locker\XApi\Errors\Error as Error;
 
 class StatementBase extends Element {
   protected $props = [
@@ -11,4 +12,20 @@ class StatementBase extends Element {
     'attachments' => 'Locker\XApi\Attachments'
   ];
   protected $required_props = ['actor', 'verb', 'object'];
+
+  public function validate() {
+    $errors = [];
+    $verb_id = $this->getPropValue('verb.id');
+    $object_type = $this->getPropValue('object.objectType');
+
+    // Validates voider.
+    if (
+      $verb_id === 'http://adlnet.gov/expapi/verbs/voided' &&
+      $object_type !== 'StatementRef'
+    ) {
+      $errors[] = new Error("`object.objectType` must be `StatementRef` not `$object_type` when voiding");
+    }
+
+    return array_merge($errors, parent::validate());
+  }
 }

tests/test.php

@@ -3,7 +3,7 @@
 
 use Locker\XApi as XApi;
 
-
+header('Content-Type: application/json');
 try {
   // Code.
   $file_location = 'assets/test.json';