public function testExecutableCommandIncludesCharsetWhenSpecified()
 {
     $configuration = new Configuration();
     $configuration->setDocumentUri('file:/foo/example.html');
     $configuration->setDocumentCharacterSet('utf8');
     $this->assertEquals('/usr/local/validator/cgi-bin/check output=json charset=utf8 uri=file:/foo/example.html', $configuration->getExecutableCommand());
 }