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

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

@@ -0,0 +1,70 @@
+<?php
+
+use Carbon\Carbon;
+use Codeception\Util\Stub;
+use MailPoet\Models\SendingQueue;
+use MailPoet\Models\Setting;
+use MailPoet\Services\Bridge;
+
+require_once('KeyCheckWorkerMockImplementation.php');
+use MailPoet\Cron\Workers\KeyCheck\MockKeyCheckWorker;
+
+class KeyCheckWorkerTest extends MailPoetTest {
+  function _before() {
+    $this->worker = new MockKeyCheckWorker();
+  }
+
+  function testItCanInitializeBridgeAPI() {
+    $this->worker->initApi();
+    expect($this->worker->bridge instanceof Bridge)->true();
+  }
+
+  function testItReturnsTrueOnSuccessfulKeyCheck() {
+    $queue = $this->createRunningQueue();
+    $result = $this->worker->processQueueLogic($queue);
+    expect($result)->true();
+  }
+
+  function testItReschedulesCheckOnException() {
+    $worker = Stub::make(
+      $this->worker,
+      array(
+        'checkKey' => function () { throw new \Exception; },
+        'reschedule' => Stub::once()
+      ),
+      $this
+    );
+    $queue = $this->createRunningQueue();
+    $result = $worker->processQueueLogic($queue);
+    expect($result)->false();
+  }
+
+  function testItReschedulesCheckOnError() {
+    $worker = Stub::make(
+      $this->worker,
+      array(
+        'checkKey' => array('code' => Bridge::CHECK_ERROR_UNAVAILABLE),
+        'reschedule' => Stub::once()
+      ),
+      $this
+    );
+    $queue = $this->createRunningQueue();
+    $result = $worker->processQueueLogic($queue);
+    expect($result)->false();
+  }
+
+  private function createRunningQueue() {
+    $queue = SendingQueue::create();
+    $queue->type = MockKeyCheckWorker::TASK_TYPE;
+    $queue->status = null;
+    $queue->scheduled_at = Carbon::createFromTimestamp(current_time('timestamp'));
+    $queue->newsletter_id = 0;
+    $queue->save();
+    return $queue;
+  }
+
+  function _after() {
+    ORM::raw_execute('TRUNCATE ' . Setting::$_table);
+    ORM::raw_execute('TRUNCATE ' . SendingQueue::$_table);
+  }
+}