Code review comment for ~sylvain-pineau/checkbox-ng:fix-1896881

The merge was fine but running tests failed.

[xenial] [04:01:07] starting container
[focal] [04:01:10] starting container
[bionic] [04:01:11] starting container
Device project added to xenial-testing
Device project added to focal-testing
Device project added to bionic-testing
[xenial] [04:01:25] provisioning container
[bionic] [04:01:32] provisioning container
[focal] [04:01:32] provisioning container
[xenial] [04:03:21] Starting tests...
[xenial] Found a test script: ./requirements/001-container-tests-plainbox-egg-info
[xenial] [04:03:23] 001-container-tests-plainbox-egg-info: PASS
[xenial] Found a test script: ./requirements/container-tests-checkbox-documentation
[bionic] [04:03:28] Starting tests...
[bionic] Found a test script: ./requirements/001-container-tests-plainbox-egg-info
[xenial] [04:03:28] container-tests-checkbox-documentation: PASS
[xenial] Found a test script: ./requirements/container-tests-checkbox-ng-unit
[bionic] [04:03:29] 001-container-tests-plainbox-egg-info: PASS
[bionic] Found a test script: ./requirements/container-tests-checkbox-documentation
[bionic] [04:03:33] container-tests-checkbox-documentation: PASS
[bionic] Found a test script: ./requirements/container-tests-checkbox-ng-unit
[xenial] [04:03:33] container-tests-checkbox-ng-unit: PASS
[xenial] Found a test script: ./requirements/container-tests-providers-internal
[focal] [04:03:35] Starting tests...
[focal] Found a test script: ./requirements/001-container-tests-plainbox-egg-info
[xenial] [04:03:35] container-tests-providers-internal: PASS
[xenial] [04:03:35] Fixing file permissions in source directory
[focal] [04:03:35] 001-container-tests-plainbox-egg-info: PASS
[focal] Found a test script: ./requirements/container-tests-checkbox-documentation
[xenial] [04:03:35] Destroying container
[bionic] [04:03:39] container-tests-checkbox-ng-unit: PASS
[bionic] Found a test script: ./requirements/container-tests-providers-internal
[focal] [04:03:39] container-tests-checkbox-documentation: PASS
[focal] Found a test script: ./requirements/container-tests-checkbox-ng-unit
[focal] [04:03:41] container-tests-checkbox-ng-unit: FAIL
[bionic] [04:03:42] container-tests-providers-internal: PASS
[bionic] [04:03:42] Fixing file permissions in source directory
[bionic] [04:03:42] Destroying container
[focal] output: https://paste.ubuntu.com/p/x8bHxtptnW/
[focal] Found a test script: ./requirements/container-tests-providers-internal
[focal] [04:03:46] container-tests-providers-internal: PASS
[focal] [04:03:46] Fixing file permissions in source directory
[focal] [04:03:46] Destroying container