writeln("BEGIN TESTING CHAIN OF RESPONSIBILITY PATTERN");
writeln("");
$bookTopic = new BookTopic("PHP 5");
writeln("bookTopic before title is set:");
writeln("topic: " . $bookTopic->getTopic());
writeln("title: " . $bookTopic->getTitle());
writeln("");
$bookTopic->setTitle("PHP 5 Recipes by Babin, Good, Kroman, and Stephens");
writeln("bookTopic after title is set: ");
writeln("topic: " . $bookTopic->getTopic());
writeln("title: " . $bookTopic->getTitle());
writeln("");
$bookSubTopic = new BookSubTopic("PHP 5 Patterns", $bookTopic);
writeln("bookSubTopic before title is set: ");
writeln("topic: " . $bookSubTopic->getTopic());
writeln("title: " . $bookSubTopic->getTitle());
writeln("");
$bookSubTopic->setTitle("PHP 5 Objects Patterns and Practice by Zandstra");
writeln("bookSubTopic after title is set: ");
writeln("topic: " . $bookSubTopic->getTopic());
writeln("title: " . $bookSubTopic->getTitle());
writeln("");
$bookSubSubTopic = new BookSubSubTopic("PHP 5 Patterns for Cats", $bookSubTopic);
writeln("bookSubSubTopic with no title set: ");
writeln("topic: " . $bookSubSubTopic->getTopic());
writeln("title: " . $bookSubSubTopic->getTitle());
writeln("");
$bookSubTopic->setTitle(NULL);
writeln("bookSubSubTopic with no title for set for bookSubTopic either:");
writeln("topic: " . $bookSubSubTopic->getTopic());
writeln("title: " . $bookSubSubTopic->getTitle());
require_once __DIR__ . '/../../../vendor/autoload.php';
echo '<pre>';
echo "BEGIN TESTING CHAIN OF RESPONSIBILITY PATTERN" . PHP_EOL;
$bookTopic = new BookTopic("PHP 5");
echo "bookTopic before title is set:" . PHP_EOL;
echo "topic: " . $bookTopic->getTopic() . PHP_EOL;
echo "title: " . $bookTopic->getTitle() . PHP_EOL;
echo "===============================" . PHP_EOL;
$bookTopic->setTitle("PHP 5 Recipes by Babin, Good, Keoman, and Stephens");
echo "bookTopic after title is set:" . PHP_EOL;
echo "topic: " . $bookTopic->getTopic() . PHP_EOL;
echo "title: " . $bookTopic->getTitle() . PHP_EOL . PHP_EOL;
$bookSubTopic = new BookSubTopic("PHP Patterns", $bookTopic);
echo "bookSubTopic before title is set:" . PHP_EOL;
echo "topic: " . $bookSubTopic->getTopic() . PHP_EOL;
echo "title: " . $bookSubTopic->getTitle() . PHP_EOL;
echo "===============================" . PHP_EOL;
$bookSubTopic->setTitle("PHP 5 Objects Patterns and Practice by Zandstra");
echo "bookSubTopic after title is set:" . PHP_EOL;
echo "topic: " . $bookSubTopic->getTopic() . PHP_EOL;
echo "title: " . $bookSubTopic->getTitle() . PHP_EOL . PHP_EOL;
$bookSubSubTopic = new BookSubSubTopic("PHP Patterns for Cats", $bookSubTopic);
echo "bookSubSubTopic before title is set:" . PHP_EOL;
echo "topic: " . $bookSubSubTopic->getTopic() . PHP_EOL;
echo "title: " . $bookSubSubTopic->getTitle() . PHP_EOL;
echo "===============================" . PHP_EOL;
$bookSubTopic->setTitle(null);
echo "bookSubSubTopic with no title for set for bookSubTopic either: " . PHP_EOL;
echo "topic: " . $bookSubSubTopic->getTopic() . PHP_EOL;
echo "title: " . $bookSubSubTopic->getTitle() . PHP_EOL . PHP_EOL;