/**
  * test that map alias converts aliases to content types.
  *
  * @return void
  */
 public function testMapAlias()
 {
     $result = $this->RequestHandler->mapAlias('xml');
     $this->assertEquals('application/xml', $result);
     $result = $this->RequestHandler->mapAlias('text/html');
     $this->assertNull($result);
     $result = $this->RequestHandler->mapAlias('wap');
     $this->assertEquals('text/vnd.wap.wml', $result);
     $result = $this->RequestHandler->mapAlias(array('xml', 'js', 'json'));
     $expected = array('application/xml', 'application/javascript', 'application/json');
     $this->assertEquals($expected, $result);
 }