Fix: Do not reuse test fixtures

[localheinz]

This PR

• provides dedicated fixtures for reach rule

Follows #1 and #4.

[codecov]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master     #8   +/-   ##
=======================================
  Coverage       100%   100%           
  Complexity        9      9           
=======================================
  Files             2      2           
  Lines            18     18           
=======================================
  Hits             18     18

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