[MRG] Add tests for normalized WDA

[rflamary]

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Motivation and context / Related issue

How has this been tested (if it applies)

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document.
• All tests passed, and additional code has been covered with new tests.

[codecov]

Codecov Report

Merging #296 (818b69e) into master (1b5c35b) will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #296      +/-   ##
==========================================
+ Coverage   92.94%   93.10%   +0.16%     
==========================================
  Files          20       20              
  Lines        4237     4237              
==========================================
+ Hits         3938     3945       +7     
+ Misses        299      292       -7