test: add comprehensive tests for query functions

[greatest0fallt1me]

Write comprehensive test cases for the query functions to ensure correctness and gas efficiency.

Requirements and Context:

• Must achieve minimum 95% test coverage
• Should test all query functions
• Should test query accuracy
• Should test edge cases (non-existent events, empty results)
• Should test gas efficiency
• Should test return data structure

Suggested Execution:

1. Fork the repo and create a branch

   git checkout -b test/query-functions-tests

2. Implement changes

   • Write tests: src/test.rs (add query function tests)
   • Add edge case tests (non-existent data)
   • Add gas efficiency tests
   • Include test documentation
   • Validate test coverage

3. Test and commit

   • Run tests with coverage
   • Verify all edge cases pass
   • Include test output

Example Commit Message:

test: add comprehensive tests for query functions

Guidelines:

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 24 hours

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 150 Points.

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[OtowoSamuel]

@OtowoSamuel has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

I’d like to work on this issue because comprehensive tests are essential for ensuring contract correctness and long-term reliability. I have experience writing unit and integration tests for smart contract query functions, covering edge cases, state transitions, and failure scenarios. I’m comfortable using test frameworks to improve coverage, prevent regressions, and ensure predictable contract behavior as the codebase evolves.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @OtowoSamuel to this issue.

[delfinacorr]

@delfinacorr has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

Hi! I would like to work on this issue. I have experience with Rust testing and I am confident I can reach the 95% coverage requirement. I will include:

Comprehensive unit tests in src/test.rs.

Edge case coverage (non-existent data and empty results).

Gas efficiency benchmarks for each query function.

Full documentation and coverage reports.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @delfinacorr to this issue.

[drips-wave]

Congratulations, @OtowoSamuel! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on January 31, 2026.

🧑‍💻 @OtowoSamuel: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

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[OtowoSamuel]

@greatest0fallt1me Kindly review my PR

[OtowoSamuel]

@greatest0fallt1me Kindly review my PR

[OtowoSamuel]

@greatest0fallt1me You haven't assigned me the point on Drips?

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @OtowoSamuel as part of the Stellar Wave Program's 1st Wave 🥳

Moderator's reason: Work has been completed and merged in this PR - http://github.com/Predictify-org/predictify-contracts/pull/235

😎 @OtowoSamuel: You earned 150 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

🧑‍💻 Repo maintainers: How'd the contributor do? If you like, you can reward them with additional points by making a compliment within seven days after the Wave Program's current wave ends.

ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.