Write a function (to use with diag) to dump server logs on integration test failure

[alexgarel]

When we have non 200 response while fetching a url in integrations tests, that usually means the servers did encounter an error.

Test::More proposes to use the diag function to add a message in this cases.

We could write an helper function that return last lines of logs files (log4perl etc.) on failure and use diag to display them.

is $response->{_rc}, 200 || diag(get_server_logs())

Even better, we could have a function (called before doing a request) to register log state before the request (how many lines in them), so that get_server_logs returns all lines of logs emitted during the request (so we are sure to capture the log).

[github-actions]

This issue is stale because it has been open 90 days with no activity.

[alexgarel]

We did create a tail_log_start and tail_log_read function in APITest.pm, but right now it's only used in create_user sub. We could use it in other functions.

[github-actions]

This issue has been open 90 days with no activity. Can you give it a little love by linking it to a parent issue, adding relevant labels and projets, creating a mockup if applicable, adding code pointers from https://github.com/openfoodfacts/openfoodfacts-server/blob/main/.github/labeler.yml, giving it a priority, editing the original issue to have a more comprehensive description… Thank you very much for your contribution to 🍊 Open Food Facts