Added possibility to directly set the expression

Author: ancyrweb

Task/Schedule.php

@@ -107,6 +107,14 @@ public function getExpression() {
     return $this->cron->getExpression();
   }
 
+  /**
+   * @param string $value
+   */
+  public function setExpression(string $value) {
+    $this->cron->setExpression($value);
+    return $this;
+  }
+
   /**
    * Return true if the schedule is due to now
    * @param $currentTime

Tests/Task/ScheduleTest.php

@@ -70,4 +70,13 @@ public function testDaily() {
       "1 2 * 4 5"
     );
   }
+  public function testSetExpression() {
+    $schedule = new Schedule("* * * * *");
+    $schedule->setExpression("0 * * * *");
+
+    $this->assertEquals(
+      $schedule->getExpression(),
+      "0 * * * *"
+    );
+  }
 }