Small test fixes

[EarlMilktea]

Description of the change:

• Fix noncritical import issues
• Silence harmless/expected warnings

Related issue:

Related to #134 .

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.84%. Comparing base (2a032e4) to head (8718048).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
- Coverage   71.91%   71.84%   -0.08%     
==========================================
  Files          30       30              
  Lines        5359     5359              
==========================================
- Hits         3854     3850       -4     
- Misses       1505     1509       +4     

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