Added unit test for cron validator

tests/unit/Event/EventTest.php

@@ -2,12 +2,11 @@
 
 namespace Appwrite\Tests;
 
-use Exception;
 use Utopia\Request;
 use Event\Event;
 use PHPUnit\Framework\TestCase;
 
-class LocaleTest extends TestCase
+class EventTest extends TestCase
 {
     /**
      * @var Event

tests/unit/Task/Validator/CronTest.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Appwrite\Tests;
+
+use Task\Validator\Cron;
+use PHPUnit\Framework\TestCase;
+
+class CronTest extends TestCase
+{
+    /**
+     * @var Cron
+     */
+    protected $object = null;
+
+    public function setUp()
+    {
+        $this->object = new Cron();
+    }
+
+    public function tearDown()
+    {
+    }
+
+    public function testValues()
+    {
+        $this->assertEquals($this->object->isValid('0 2 * * *'), true); // execute at 2am daily
+        $this->assertEquals($this->object->isValid('0 5,17 * * *'), true); // execute twice a day
+        $this->assertEquals($this->object->isValid('* * * * *'), true); // execute on every minutes
+        // $this->assertEquals($this->object->isValid('0 17 * * sun'), true); // execute on every Sunday at 5 PM
+        $this->assertEquals($this->object->isValid('*/10 * * * *'), true); // execute on every 10 minutes
+        // $this->assertEquals($this->object->isValid('* * * jan,may,aug *'), true); // execute on selected months
+        // $this->assertEquals($this->object->isValid('0 17 * * sun,fri'), true); // execute on selected days
+        // $this->assertEquals($this->object->isValid('0 2 * * sun'), true); // execute on first sunday of every month
+        $this->assertEquals($this->object->isValid('0 */4 * * *'), true); //  execute on every four hours
+        // $this->assertEquals($this->object->isValid('0 4,17 * * sun,mon'), true); // execute twice on every Sunday and Monday
+    }
+}