Backend already has `@nestjs/testing` but most tests instantiate services with no mocks

[mercy60]

Internal ID: #95

Imported from ISSUES.md via scripts/import-issues.mjs.

Problem Statement. quiz.service.spec.ts uses Test.createTestingModule({ providers: [QuizService] }) — this leaves QuizService partially constructed because its dependencies (manual injections) are not provided.

Expected Outcome.

• Each spec builds a complete module with mocks.

Acceptance Criteria.

• Tests succeed independently.

Files / modules affected.

• All spec files.

Dependencies. None.

Difficulty / Effort. Medium / L (≈ 1 week).

Labels. testing

[Mayorlay]

@Mayorlay has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello please This issue aligns well with my experience. I can work on it and submit a polished PR for reviewHello please This issue aligns well with my experience. I can work on it and submit a polished PR for review

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[Toyinoje]

@Toyinoje has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello please This issue aligns well with my experience. I can work on it and submit a polished PR for review

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[bibi-fay]

@bibi-fay has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Gm Gm,

I would love to work on this issue?

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