Extract simple workers common code into a base class [PREMIUM-4]

tests/unit/Cron/Workers/KeyCheck/SendingServiceKeyCheckTest.php

@@ -0,0 +1,47 @@
+<?php
+
+use Codeception\Util\Stub;
+use MailPoet\Cron\Workers\KeyCheck\SendingServiceKeyCheck;
+use MailPoet\Mailer\Mailer;
+use MailPoet\Models\Setting;
+use MailPoet\Services\Bridge;
+
+class SendingServiceKeyCheckTest extends MailPoetTest {
+  function _before() {
+    $this->worker = new SendingServiceKeyCheck(microtime(true));
+  }
+
+  function testItRequiresMailPoetMethodToBeSetUp() {
+    expect($this->worker->checkProcessingRequirements())->false();
+    $this->setMailPoetSendingMethod();
+    expect($this->worker->checkProcessingRequirements())->true();
+  }
+
+  function testItChecksMSSKey() {
+    $response = array('code' => Bridge::MAILPOET_KEY_VALID);
+    $this->worker->bridge = Stub::make(
+      new Bridge,
+      array(
+        'checkMSSKey' => $response,
+        'updateSubscriberCount' => Stub::once()
+      ),
+      $this
+    );
+    $this->setMailPoetSendingMethod();
+    expect($this->worker->checkKey())->equals($response);
+  }
+
+  private function setMailPoetSendingMethod() {
+    Setting::setValue(
+      Mailer::MAILER_CONFIG_SETTING_NAME,
+      array(
+        'method' => 'MailPoet',
+        'mailpoet_api_key' => 'some_key',
+      )
+    );
+  }
+
+  function _after() {
+    ORM::raw_execute('TRUNCATE ' . Setting::$_table);
+  }
+}