EEG data test

[uncircle]

add baseline for eeg data, augment original eeg data

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.40%. Comparing base (f43887c) to head (53ce0f1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   99.25%   99.40%   +0.14%     
==========================================
  Files          28       28              
  Lines        2297     2372      +75     
==========================================
+ Hits         2280     2358      +78     
+ Misses         17       14       -3     

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