Some refactoring for to_slug_param

This release has minor changes for internal methods which provide processing of incoming test strings

was

    def has_section? section_name
        to_hash.key? section_name.to_s.to_slug_param(delimiter: '_')
    end

became

    def has_section? section_name
        to_hash.key? section_name.to_slug_param(sep: '_')
    end