public function grade(CodingExecutionResult $result)
{
$result->assertInputContains('index.php', 'foreach');
$result->assertElementContains('h3', 'Kitty');
$result->assertElementContains('h3', 'Tiger');
$result->assertElementContains('h3', 'Jay');
$buttonCount = substr_count($result->getOutput(), '<button>');
if ($buttonCount == 0) {
throw new GradingException('Don\'t forget to add a `<button>Schedule me</button>` inside the `foreach` for each walker!');
}
if ($buttonCount == 1) {
throw new GradingException('I only see 1 `<button>` - make sure to include this *inside* the `foreach` loop so that 3 are printed');
}
if ($buttonCount != 3) {
throw new GradingException('There should be 3 `<button>` element exactly');
}
}
