refactor(parser): avoid circular mocks

[omermorad]

Avoid circular mocks, closes #65

[codecov]

Codecov Report

Merging #137 (61f9734) into next (9370127) will increase coverage by 0.29%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##             next     #137      +/-   ##
==========================================
+ Coverage   84.98%   85.28%   +0.29%     
==========================================
  Files          18       18              
  Lines         453      462       +9     
  Branches      120      123       +3     
==========================================
+ Hits          385      394       +9     
  Misses         18       18              
  Partials       50       50              

Impacted Files	Coverage Δ
packages/parser/src/lib/types/types.ts	100.00% <ø> (ø)
packages/parser/src/lib/parser/class-parser.ts	92.30% <93.75%> (+1.23%)	⬆️
.../parser/src/lib/handlers/class-callback-handler.ts	76.47% <100.00%> (ø)

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