Adds test for member param of type String.
Adds test for member param of type String.

Jesus/dropbox_api,Mavvie/dropbox_api,Jesus/dropbox_api,luigi-sk/dropbox_api,Mavvie/dropbox_api,luigi-sk/dropbox_api,Jesus/dropbox_api,Jesus/dropbox_api_v2,Jesus/dropbox_api_v2,Mavvie/dropbox_api