Minor changes coming from students

[xavierlepretre]

This PR introduced changes suggested by student. In particular, a simplification of how the hands-on exercise's unit tests are simplified when introducing wager payments.

R1: Internal review (B9lab)

• Technical review
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  • [ ] completed
• Language review
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R2: External review

• Technical review
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• Language review
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R3: Internal QA review (B9lab)

• Technical review
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• Language review
  • [ ] requested
  • [ ] completed

R4: Final external QA review

• Technical review
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  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

RC: Release Candidate

• [ ] Ready to be merged

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