public function testGenerateHtmlId()
 {
     $this->assertEquals('title-one', DocumentationParser::generate_html_id('title one'));
     $this->assertEquals('title-one', DocumentationParser::generate_html_id('Title one'));
     $this->assertEquals('title-and-one', DocumentationParser::generate_html_id('Title & One'));
     $this->assertEquals('title-and-one', DocumentationParser::generate_html_id('Title & One'));
     $this->assertEquals('title-one', DocumentationParser::generate_html_id(' Title one '));
     $this->assertEquals('title-one', DocumentationParser::generate_html_id('Title--one'));
 }