Add test cases

[xenosf]

• add e2e (system) tests
• fix some bugs (that were caught by the tests)
  note: matching is not working for unknown reason. those tests have been placed in a subfolder and won't automatically run -- move them back to the e2e folder to re-enable them

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
client/src/hooks/useAuth.js	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
server/question-service/routes/questionRoute.js	100.00% <100.00%> (ø)
client/src/hooks/useAuth.js	33.33% <0.00%> (ø)