[MNT] Tests: Fix tearDown calls

[ales-erjavec]

Issue

Ref: biolab/orange-widget-base#290

Description of changes

Fix compatibility with biolab/orange-widget-base#290

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.02%. Comparing base (992197b) to head (6276528).
⚠️ Report is 78 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7212      +/-   ##
==========================================
- Coverage   89.02%   89.02%   -0.01%     
==========================================
  Files         335      335              
  Lines       74222    74222              
==========================================
- Hits        66079    66077       -2     
- Misses       8143     8145       +2     

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