Add supporting test

CRM/Contact/Form/Task/LabelCommon.php

@@ -30,7 +30,10 @@ class CRM_Contact_Form_Task_LabelCommon {
    * @param string $fileName
    *   The name of the file to save the label in.
    */
-  public static function createLabel(&$contactRows, &$format, $fileName = 'MailingLabels_CiviCRM.pdf') {
+  public static function createLabel($contactRows, $format, $fileName = 'MailingLabels_CiviCRM.pdf') {
+    if (CIVICRM_UF === 'UnitTests') {
+      throw new CRM_Core_Exception_PrematureExitException('civiExit called', ['rows' => $contactRows, 'format' => $format, 'file_name' => $fileName]);
+    }
     $pdf = new CRM_Utils_PDF_Label($format, 'mm');
     $pdf->Open();
     $pdf->AddPage();

tests/phpunit/CRM/Member/Form/Task/LabelTest.php

@@ -0,0 +1,53 @@
+<?php
+/*
+ +--------------------------------------------------------------------+
+ | Copyright CiviCRM LLC. All rights reserved.                        |
+ |                                                                    |
+ | This work is published under the GNU AGPLv3 license with some      |
+ | permitted exceptions and without any warranty. For full license    |
+ | and copyright information, see https://civicrm.org/licensing       |
+ +--------------------------------------------------------------------+
+ */
+
+/**
+ * @package CiviCRM_APIv3
+ * @subpackage API_Contribution
+ * @group headless
+ */
+class CRM_Member_Form_Task_LabelTest extends CiviUnitTestCase {
+
+  /**
+   * Test print label.
+   *
+   * This is a 'no error' test to support refactoring. It ensures no fatal is hit & lays
+   * the basis for more tests later.
+   */
+  public function testMembershipTokenReplacementInPDF() {
+    // First check tasks are there is some weird static caching that could mess us up.
+    $tasks = CRM_Member_Task::tasks();
+    $this->assertArrayHasKey(201, $tasks);
+    $tasks = CRM_Member_Task::permissionedTaskTitles(CRM_Core_Permission::EDIT);
+    $this->assertArrayHasKey(201, $tasks);
+    $membershipID = $this->contactMembershipCreate(['contact_id' => $this->individualCreate()]);
+    /* @var CRM_Member_Form_Task_Label $form */
+    $form = $this->getFormObject('CRM_Member_Form_Task_Label', [
+      'task' => 201,
+      'radio_ts' => 'ts_sel',
+    ], 'Search');
+
+    $_SESSION['_' . $form->controller->_name . '_container']['values']['Label'] = [
+      'location_type_id' => NULL,
+      'label_name' => 3475,
+    ];
+    $form->preProcess();
+    $form->ids = [$membershipID => $membershipID];
+    $form->buildForm();
+    try {
+      $form->postProcess();
+    }
+    catch (CRM_Core_Exception_PrematureExitException $e) {
+      $this->assertEquals(3475, $e->errorData['format']);
+    }
+  }
+
+}