public function testString()
{
$this->assertEquals('hello-world', String::camelCaseToDash('HelloWorld'));
$this->assertEquals('hello_world', String::camelCaseToUnderscore('HelloWorld'));
$this->assertEquals('helloWorld', String::dashToCamelCase('hello-world'));
$this->assertEquals('hello_world', String::dashToUnderscore('hello-world'));
}