feat: add more and more tests

[raphasampaio]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 99.13793% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.33%. Comparing base (83621fb) to head (164e09a).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/test_migrations.cpp	97.14%	1 Missing and 2 partials ⚠️
tests/test_row_result.cpp	99.08%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   84.96%   87.33%   +2.36%     
==========================================
  Files          44       49       +5     
  Lines        6179     6648     +469     
  Branches      392      399       +7     
==========================================
+ Hits         5250     5806     +556     
+ Misses        925      836      -89     
- Partials        4        6       +2     

Flag	Coverage Δ
cpp	91.63% <99.13%> (+2.49%)	⬆️
dart	71.86% <ø> (ø)
julia	60.22% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
tests/test_database_errors.cpp	100.00% <100.00%> (ø)
tests/test_database_relations.cpp	100.00% <100.00%> (ø)
tests/test_lua_runner.cpp	100.00% <100.00%> (ø)
tests/test_schema_validator.cpp	100.00% <100.00%> (ø)
tests/test_row_result.cpp	99.08% <99.08%> (ø)
tests/test_migrations.cpp	97.14% <97.14%> (ø)

... and 10 files with indirect coverage changes

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