code: def key_press(keys)
        dump_caller_stack
        
        if keys =~ /^Ctrl\+([A-Z])$/
          filtered_keys = "^+#{$1}"
        elsif keys =~ /^Ctrl\+Shift\+([A-Z])$/
          filtered_keys = "^+#{$1.downcase}"
        elsif keys =~ /^Alt+([A-Z])$/
          filtered_keys = "!+#{$1}"
        elsif keys =~ /^Alt\+Shift\+([a-z])$/
          filtered_keys = "!+#{$1.downcase}"
        else
          filtered_keys = keys
        end
        filtered_keys = keys.gsub("Alt+", "!+").gsub("Ctrl+", "^+")
        RFormSpec::Keyboard.press(filtered_keys)
        sleep 0.5
      end
docs: wrapper of keyboard operations