public function testInvalidCreatorRobotDataCreate()
 {
     $validRobotName = "TARS";
     $invalidCreators = array("-2");
     $validStatus = "in-development";
     $s1 = new RobotData(array("robot_name" => $validRobotName, "creators" => $invalidCreators, "status" => $validStatus));
     $this->assertTrue(!empty($s1->getError('creator')) && strcmp(Messages::getError('ROBOT_CREATOR_INVALID'), $s1->getError('creator')) == 0, 'It should have a creator error if the creator id is invalid');
 }
<?php 
$invalidCreatorNameTest = array("creator" => "");
$s4 = new RobotData($invalidCreatorNameTest);
$test4 = empty($s4->getErrors()) ? '' : 'Failed:It should have errors when invalid input is provided<br>';
echo $test4;
echo "The error for creator is: " . $s4->getError('creator') . "<br>";
echo "The object is: {$s4}<br>";
?>

<h2>It should have an error when the status is empty</h2>
<?php 
$invalidStatusTest = array("status" => "");
$s5 = new RobotData($invalidStatusTest);
$test5 = empty($s5->getErrors()) ? '' : 'Failed:It should have errors when invalid input is provided<br>';
echo $test5;
echo "The error for status is: " . $s5->getError('status') . "<br>";
echo "The object is: {$s5}<br>";
?>

<h2>It should have an error when the status is invalid</h2>
<?php 
$invalidStatusTest = array("status" => "invalid-status");
$s6 = new RobotData($invalidStatusTest);
$test6 = empty($s6->getErrors()) ? '' : 'Failed:It should have errors when invalid input is provided<br>';
echo $test6;
echo "The error for status is: " . $s6->getError('status') . "<br>";
echo "The object is: {$s6}<br>";
?>
</body>
</html>