Bring coverage back to 100%

[benoit74]

Fix #293

Changes:

• add no cover pragma in various places:
  • src/zimscraperlib/i18n.py: ... or pass is never executed
  • src/zimscraperlib/zim/indexing.py: impossible to create such a condition under normal lib operation
  • src/zimscraperlib/rewriting/js.py: tricky case, isStrict option is already set in JsRewriter.rewrite based on _detect_strict_mode function which uses the same class hint ; cannot reproduce condition in isolation, not that sure this line is really needed but does not harm tbh
• add standard test cases for ensure_matches function

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.96%. Comparing base (3adcd39) to head (149333a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #302      +/-   ##
==========================================
+ Coverage   99.72%   99.96%   +0.23%     
==========================================
  Files          41       41              
  Lines        2545     2542       -3     
  Branches      365      362       -3     
==========================================
+ Hits         2538     2541       +3     
+ Misses          2        0       -2     
+ Partials        5        1       -4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.