public function removeSetting()
 {
     $options = new RuntimeOptions();
     $options->withSetting('encoding', 'utf-8');
     $options->withSetting('encoding', null);
     $this->assertNull($options->getSetting('encoding'));
 }
 public function overwritingSetting()
 {
     $options = new RuntimeOptions();
     $options->withSetting('extension', 'php_xsl.dll');
     $options->withSetting('extension', 'php_sybase_ct.dll');
     $this->assertEquals(array('php_sybase_ct.dll'), $options->getSetting('extension'));
 }