Add missing this for stubs expecting a number of method calls to work

tests/unit/Config/InstallerTest.php

@@ -18,7 +18,8 @@ class InstallerTest extends MailPoetTest {
       $this->installer,
       array(
         'getPluginInformation' => Stub::once()
-      )
+      ),
+      $this
     );
     $installer->init();
     apply_filters('plugins_api', null, null, null);
@@ -51,7 +52,8 @@ class InstallerTest extends MailPoetTest {
           $obj->package = $obj->download_link;
           return $obj;
         }
-      )
+      ),
+      $this
     );
     $result = $installer->getPluginInformation(false, 'plugin_information', $args);
     expect($result->slug)->equals($this->slug);

tests/unit/Config/RendererTest.php

@@ -50,7 +50,8 @@ class RendererTest extends MailPoetTest {
         'renderer' => Stub::makeEmpty('Twig_Environment',
           array(
             'render' => Stub::atLeastOnce(function() { return 'test render'; }),
-          )
+          ),
+          $this
         ),
       )
     );
@@ -69,7 +70,8 @@ class RendererTest extends MailPoetTest {
             'render' => Stub::atLeastOnce(function() use ($exception_message) {
               throw new \RuntimeException($exception_message);
             }),
-          )
+          ),
+          $this
         ),
       )
     );

tests/unit/Config/UpdaterTest.php

@@ -21,7 +21,8 @@ class UpdaterTest extends MailPoetTest {
       $this->updater,
       array(
         'checkForUpdate' => Stub::once()
-      )
+      ),
+      $this
     );
     $updater->init();
     apply_filters('pre_set_site_transient_update_plugins', null);
@@ -48,7 +49,8 @@ class UpdaterTest extends MailPoetTest {
             'package' => home_url() . '/wp-content/uploads/mailpoet-premium.zip'
           );
         }
-      )
+      ),
+      $this
     );
     $result = $updater->checkForUpdate($update_transient);
     expect($result->last_checked)->greaterOrEquals($update_transient->last_checked);