Exporting to Excel from Lino Noi

This just tests whether certain tables are exportable to Excel. For more explanations see export_excel : Exporting to Excel of The lino-book package.

>>> url = "/api/working/Sessions?an=export_excel"
>>> test_client.force_login(rt.login('robin').user)
>>> res = test_client.get(url, REMOTE_USER='robin')
>>> print(res.status_code)
200