diff --git a/src/Event.php b/src/Event.php
index 2a2e7f2..3019f9c 100644
--- a/src/Event.php
+++ b/src/Event.php
@@ -33,7 +33,7 @@ class Event extends Component
      *
      * @var string
      */
-    protected $_expression = '* * * * * *';
+    protected $_expression = '* * * * *';
     /**
      * The timezone the date should be evaluated on.
      *
diff --git a/tests/FrequencyTest.php b/tests/FrequencyTest.php
index 40478b9..dd59f2a 100644
--- a/tests/FrequencyTest.php
+++ b/tests/FrequencyTest.php
@@ -7,113 +7,118 @@
 class FrequencyTest extends \PHPUnit_Framework_TestCase
 {
     /*
-     * @var Event
+     * @var yii\mutex\Mutex
      */
-    protected $event;
+    protected $mutex;
 
     protected function setUp()
     {
-        $this->event = new Event(
-            $this->getMock('yii\mutex\Mutex'),
-            'php foo'
+        $this->mutex = $this->getMock('yii\mutex\Mutex');
+    }
+
+    protected function getEvent()
+    {
+        return new Event(
+            $this->mutex,
+            ''
         );
     }
 
     public function testEveryMinute()
     {
-        $this->assertSame('* * * * *', $this->event->getExpression());
-        $this->assertSame('* * * * *', $this->event->everyMinute()->getExpression());
+        $this->assertSame('* * * * *', $this->getEvent()->getExpression());
+        $this->assertSame('* * * * *', $this->getEvent()->everyMinute()->getExpression());
     }
 
     public function testEveryFiveMinutes()
     {
-        $this->assertSame('*/5 * * * *', $this->event->everyFiveMinutes()->getExpression());
+        $this->assertSame('*/5 * * * *', $this->getEvent()->everyFiveMinutes()->getExpression());
     }
 
     public function testDaily()
     {
-        $this->assertSame('0 0 * * *', $this->event->daily()->getExpression());
+        $this->assertSame('0 0 * * *', $this->getEvent()->daily()->getExpression());
     }
 
     public function testTwiceDaily()
     {
-        $this->assertSame('0 3,15 * * *', $this->event->twiceDaily(3, 15)->getExpression());
+        $this->assertSame('0 3,15 * * *', $this->getEvent()->twiceDaily(3, 15)->getExpression());
     }
 
     public function testOverrideWithHourly()
     {
-        $this->assertSame('0 * * * *', $this->event->everyFiveMinutes()->hourly()->getExpression());
-        $this->assertSame('37 * * * *', $this->event->hourlyAt(37)->getExpression());
-        $this->assertSame('15,30,45 * * * *', $this->event->hourlyAt([15, 30, 45])->getExpression());
+        $this->assertSame('0 * * * *', $this->getEvent()->everyFiveMinutes()->hourly()->getExpression());
+        $this->assertSame('37 * * * *', $this->getEvent()->hourlyAt(37)->getExpression());
+        $this->assertSame('15,30,45 * * * *', $this->getEvent()->hourlyAt([15, 30, 45])->getExpression());
     }
 
     public function testMonthlyOn()
     {
-        $this->assertSame('0 15 4 * *', $this->event->monthlyOn(4, '15:00')->getExpression());
+        $this->assertSame('0 15 4 * *', $this->getEvent()->monthlyOn(4, '15:00')->getExpression());
     }
 
     public function testTwiceMonthly()
     {
-        $this->assertSame('0 0 1,16 * *', $this->event->twiceMonthly(1, 16)->getExpression());
+        $this->assertSame('0 0 1,16 * *', $this->getEvent()->twiceMonthly(1, 16)->getExpression());
     }
 
     public function testMonthlyOnWithMinutes()
     {
-        $this->assertSame('15 15 4 * *', $this->event->monthlyOn(4, '15:15')->getExpression());
+        $this->assertSame('15 15 4 * *', $this->getEvent()->monthlyOn(4, '15:15')->getExpression());
     }
 
     public function testWeekdaysDaily()
     {
-        $this->assertSame('0 0 * * 1-5', $this->event->weekdays()->daily()->getExpression());
+        $this->assertSame('0 0 * * 1-5', $this->getEvent()->weekdays()->daily()->getExpression());
     }
 
     public function testWeekdaysHourly()
     {
-        $this->assertSame('0 * * * 1-5', $this->event->weekdays()->hourly()->getExpression());
+        $this->assertSame('0 * * * 1-5', $this->getEvent()->weekdays()->hourly()->getExpression());
     }
 
     public function testWeekdays()
     {
-        $this->assertSame('* * * * 1-5', $this->event->weekdays()->getExpression());
+        $this->assertSame('* * * * 1-5', $this->getEvent()->weekdays()->getExpression());
     }
 
     public function testSundays()
     {
-        $this->assertSame('* * * * 0', $this->event->sundays()->getExpression());
+        $this->assertSame('* * * * 0', $this->getEvent()->sundays()->getExpression());
     }
 
     public function testMondays()
     {
-        $this->assertSame('* * * * 1', $this->event->mondays()->getExpression());
+        $this->assertSame('* * * * 1', $this->getEvent()->mondays()->getExpression());
     }
 
     public function testTuesdays()
     {
-        $this->assertSame('* * * * 2', $this->event->tuesdays()->getExpression());
+        $this->assertSame('* * * * 2', $this->getEvent()->tuesdays()->getExpression());
     }
 
     public function testWednesdays()
     {
-        $this->assertSame('* * * * 3', $this->event->wednesdays()->getExpression());
+        $this->assertSame('* * * * 3', $this->getEvent()->wednesdays()->getExpression());
     }
 
     public function testThursdays()
     {
-        $this->assertSame('* * * * 4', $this->event->thursdays()->getExpression());
+        $this->assertSame('* * * * 4', $this->getEvent()->thursdays()->getExpression());
     }
 
     public function testFridays()
     {
-        $this->assertSame('* * * * 5', $this->event->fridays()->getExpression());
+        $this->assertSame('* * * * 5', $this->getEvent()->fridays()->getExpression());
     }
 
     public function testSaturdays()
     {
-        $this->assertSame('* * * * 6', $this->event->saturdays()->getExpression());
+        $this->assertSame('* * * * 6', $this->getEvent()->saturdays()->getExpression());
     }
 
     public function testQuarterly()
     {
-        $this->assertSame('0 0 1 1-12/3 *', $this->event->quarterly()->getExpression());
+        $this->assertSame('0 0 1 1-12/3 *', $this->getEvent()->quarterly()->getExpression());
     }
 }