public function test_countReturnsNumberOfElements()
{
$tree = new BinaryTree();
$tree->insert(new types\NumericContainer(1));
$tree->insert(new types\NumericContainer(2));
$tree->insert(new types\NumericContainer(3));
$tree->insert(new types\NumericContainer(4));
$this->assertSame(4, $tree->count());
}
