Fix bug mocking toString()

[Roaders]

No description provided.

[codecov]

Codecov Report

Merging #64 (a38d544) into main (a5b0fcf) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #64   +/-   ##
=======================================
  Coverage   95.53%   95.53%           
=======================================
  Files          12       12           
  Lines         448      448           
  Branches       69       69           
=======================================
  Hits          428      428           
  Misses          7        7           
  Partials       13       13           

Impacted Files	Coverage Δ
main/mock/operators.ts	92.78% <100.00%> (ø)

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