Rewrite SimpleWorkerTest to tests of particular services

[MAILPOET-2539]

tests/integration/Cron/CronWorkerSchedulerTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace MailPoet\Test\Cron;
+
+use MailPoet\Cron\CronWorkerScheduler;
+use MailPoet\Models\ScheduledTask;
+use MailPoetVendor\Carbon\Carbon;
+use MailPoetVendor\Idiorm\ORM;
+
+require_once __DIR__ . '/Workers/SimpleWorkerMockImplementation.php';
+
+class CronWorkerSchedulerTest extends \MailPoetTest {
+  /** @var CronWorkerScheduler */
+  private $cron_worker_scheduler;
+
+  function _before() {
+    $this->cron_worker_scheduler = $this->di_container->get(CronWorkerScheduler::class);
+    ORM::raw_execute('TRUNCATE ' . ScheduledTask::$_table);
+  }
+
+  function testItSchedulesTask() {
+    $next_run_date = Carbon::now()->addWeek();
+    $this->cron_worker_scheduler->schedule('test', $next_run_date);
+
+    $tasks = ScheduledTask::findMany();
+    expect($tasks)->count(1);
+    expect($tasks[0]->type)->same('test');
+    expect($tasks[0]->status)->same(ScheduledTask::STATUS_SCHEDULED);
+    expect($tasks[0]->scheduled_at)->same($next_run_date->format('Y-m-d H:i:s'));
+  }
+
+  function testItDoesNotScheduleTaskTwice() {
+    $next_run_date = Carbon::now()->addWeek();
+    $this->cron_worker_scheduler->schedule('test', $next_run_date);
+    expect(ScheduledTask::findMany())->count(1);
+
+    $result = $this->cron_worker_scheduler->schedule('test', $next_run_date);
+    expect($result)->false();
+    expect(ScheduledTask::findMany())->count(1);
+  }
+
+  function testItReschedulesTask() {
+    $next_run_date = Carbon::now()->subDay();
+    $task = $this->cron_worker_scheduler->schedule('test', $next_run_date);
+    $this->cron_worker_scheduler->reschedule($task, 10);
+
+    $tasks = ScheduledTask::findMany();
+    expect($tasks)->count(1);
+    expect($tasks[0]->type)->same('test');
+    expect($tasks[0]->status)->same(ScheduledTask::STATUS_SCHEDULED);
+    expect($tasks[0]->scheduled_at)->greaterThan($next_run_date);
+    expect($tasks[0]->scheduled_at)->greaterThan(Carbon::now());
+  }
+
+  function _after() {
+    ORM::raw_execute('TRUNCATE ' . ScheduledTask::$_table);
+  }
+}