chore: add debugging for failing test case, see COUCHDB-3415

[janl]

Overview

Add test case to see what trips up this test case in COUCHDB 3415.

This could be as simple as a newline character, but I want to make sure.

Testing recommendations

This needs to run in CI for a bit until it pops up again.

JIRA issue number

https://issues.apache.org/jira/browse/COUCHDB-3415

Checklist

• Code is written and works correctly;
• Changes are covered by tests;
• Documentation reflects the changes;
• I will not forget to update rebar.config.script
  with the correct commit hash once this PR get merged.

[nickva]

+1

Though as mentioned in other PR ?debugFmt I think is the preferred way to print during EUnit tests. Minor nit though. As this is temporary until we figure out all the flakiness issues, feel free to ignore.

[janl]

@nickva good catch, I had tried that, but couldn’t get the caught error message to pass through debugFmt, so I went with the regular method.

[nickva]

Ah alright then. If user works then let go with that