I.haveFile helper broken with middleware installed from develop branch

For some reason the middleware API changed, so the helper does not work any longer.

Steps to reproduce:

1. export LAUNCH_URL=http://10.50.0.89/appsuite/ (or any other installation from develop branch)
2. yarn test --grep "user can have files" --debug

Expected result: green test
Actual result: "Cannot read property '0' of undefined" in src/helper.js:478