add cache to import all

[Krukov]

For #176

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4048500) 93.66% compared to head (78ccb3a) 93.66%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #178   +/-   ##
=======================================
  Coverage   93.66%   93.66%           
=======================================
  Files          54       54           
  Lines        3570     3570           
  Branches      613      613           
=======================================
  Hits         3344     3344           
  Misses        156      156           
  Partials       70       70           

Flag	Coverage Δ
unittests	93.58% <ø> (ø)

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