public function testWrap()
{
$this->eq(s::wrap('abcdef', 2), "ab\ncd\nef");
$this->eq(s::wrap('abcdef', 10), 'abcdef');
$this->eq(s::wrap('abcdefg', 3, 'x'), 'abcxdefxg');
}
public function wrap($cols, $sep = "\n")
{
return new self(s::wrap($this->value, $cols, self::unwrap($sep)));
}