CakeRequest::addPaths PHP Method

    public function addPaths($paths)
    {
        foreach (array('webroot', 'here', 'base') as $element) {
            if (isset($paths[$element])) {
                $this->{$element} = $paths[$element];
            }
        }
        return $this;
    }

 /**
  * Test splicing in paths.
  *
  * @return void
  */
 public function testAddPaths()
 {
     $request = new CakeRequest('some/path');
     $request->webroot = '/some/path/going/here/';
     $result = $request->addPaths(array('random' => '/something', 'webroot' => '/', 'here' => '/', 'base' => '/base_dir'));
     $this->assertSame($result, $request, 'Method did not return itself. %s');
     $this->assertEquals('/', $request->webroot);
     $this->assertEquals('/base_dir', $request->base);
     $this->assertEquals('/', $request->here);
     $this->assertFalse(isset($request->random));
 }