Improve test avoid warnings

[xavierfacq]

What is done:

• Improve tests to avoid errors
• Add AccessibilityModule in tests
• Allow attribute 'rel' in Highcharts (was a warning)
• Add a small test on Trends component

[x] npm test passes

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[codecov]

Codecov Report

Merging #365 (d24191c) into main (2f1b385) will increase coverage by 43.86%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #365       +/-   ##
===========================================
+ Coverage   52.24%   96.10%   +43.86%     
===========================================
  Files           9        9               
  Lines         848      848               
  Branches       34       66       +32     
===========================================
+ Hits          443      815      +372     
+ Misses        405       33      -372     

see 2 files with indirect coverage changes

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