public function testExtend()
{
// from js
$result = __u::extend(array(), array('a' => 'b'));
$this->assertEquals(array('a' => 'b'), $result, 'can extend an array with the attributes of another');
$result = __u::extend((object) array(), (object) array('a' => 'b'));
$this->assertEquals((object) array('a' => 'b'), $result, 'can extend an object with the attributes of another');
$result = __u::extend(array('a' => 'x'), array('a' => 'b'));
$this->assertEquals(array('a' => 'b'), $result, 'properties in source override destination');
$result = __u::extend(array('x' => 'x'), array('a' => 'b'));
$this->assertEquals(array('x' => 'x', 'a' => 'b'), $result, "properties not in source don't get overriden");
$result = __u::extend(array('x' => 'x'), array('a' => 'b'), array('b' => 'b'));
$this->assertEquals(array('x' => 'x', 'a' => 'b', 'b' => 'b'), $result, 'can extend from multiple sources');
$result = __u::extend(array('x' => 'x'), array('a' => 'a', 'x' => 2), array('a' => 'b'));
$this->assertEquals(array('x' => 2, 'a' => 'b'), $result, 'extending from multiple source objects last property trumps');
// extra
$result = __u(array('x' => 'x'))->extend(array('a' => 'a', 'x' => 2), array('a' => 'b'));
$this->assertEquals(array('x' => 2, 'a' => 'b'), $result, 'extending from multiple source objects last property trumps');
// docs
$expected = (object) array('name' => 'moe', 'age' => 50);
$result = __u::extend((object) array('name' => 'moe'), (object) array('age' => 50));
$this->assertEquals($expected, $result);
}