public function testBinaryTreeNode()
{
$node1 = new BinaryTreeNode('Dizzy');
$this->assertEquals('Dizzy', $node1->getData());
$this->assertEquals('Dizzy', (string) $node1);
$node1->setData('Miles');
$this->assertEquals('Miles', $node1->getData());
$this->assertEquals('Miles', (string) $node1);
$this->assertNull($node1->getLeft());
$this->assertNull($node1->getRight());
$node2 = new BinaryTreeNode('Cannonball');
$node3 = new BinaryTreeNode('Coltrane');
$node1->setLeft($node2);
$node1->setRight($node3);
$this->assertSame($node2, $node1->getLeft());
$this->assertSame($node3, $node1->getRight());
}
