Windows integration test don't raise errors on failure

[juergenhoetzel]

Description

Windows integration tests don't raise errors on failure

Repro steps

Run current Github Actions:

Failed to download `melpa' archive.
Package refresh done
Failed to download `gnu' archive.
Setting `package-selected-packages' temporarily since "emacs -q" would overwrite customizations
Setting `package-selected-packages' temporarily since "emacs -q" would overwrite customizations
Package `s-' is unavailable
Importing package-keyring.gpg...
Importing package-keyring.gpg...done
Contacting host: melpa.org:443
Failed to download `melpa' archive.
Package refresh done
Failed to download `gnu' archive.
Setting `package-selected-packages' temporarily since "emacs -q" would overwrite customizations
Setting `package-selected-packages' temporarily since "emacs -q" would overwrite customizations
Package `s-' is unavailable
cask exec: error: Failed to execute buttercup -L . -L test --traceback full: [Errno 2] No such file or directory
Did you run cask install?

Expected behavior

Action fail (red)

Actual behavior

Action succeed (green)

[juergenhoetzel]

Cause of the failed gnu package archive download:

emacs-eldev/eldev#56