Test large price values

[AbelOsaretin]

Description

Add a unit test verifying that compute_confidence_interval handles large price values (1e9 range) without overflow or precision loss.

Rationale

Prices on Stellar use 1e30 fixed-point precision. Large values (e.g., BTC at ~$100k = 1_000_000_000 * 1e30 stroops) must not cause integer overflow in percentile computation or spread calculation.

Test Case

#[test]
fn large_price_values() {
    let prices = vec![1_000_000_000i128, 2_000_000_000, 3_000_000_000];
    let p = compute_confidence_interval(&prices).unwrap();
    assert!(p.min <= p.max);
    assert!(p.min > 0);
    assert!(p.max > 0);
}

Acceptance Criteria

• Test exists in oracle/src/prices.rs module tests
• Verifies min <= max invariant
• Verifies both values are positive (no underflow)
• Test passes without overflow

[snzxvss]

I work with Rust and have already reviewed the oracle crate, in particular the fixed-point price handling in oracle/src/fixed.rs and prices.rs (prices are
scaled into i128, and the release profile enables overflow-checks). My approach: add tests that exercise prices in the ~1_000_000_000 range across the
parse/scale/conversion paths, confirm there's no overflow or panic, and where any unchecked arithmetic could overflow, switch to checked/saturating
operations. It's a small, focused change — I can submit the PR with cargo test passing today.

[skaichima]

@skaichima has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I'm interested in working on this issue. I have the necessary skills to handle this efficiently and would appreciate it if you could assign it to me. Thanks!

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[abayomiwav]

@abayomiwav has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please assign me this issue

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Congratulations, @abayomiwav! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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[Micheal-Blessed]

@Micheal-Blessed has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I will love to work on this issue. I work effectively and on time.

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[oscar24357]

@oscar24357 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hello maintainer, i would love to work on this issue, can you please assign me to it? Thank you.

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[Praxhant97]

@Praxhant97 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Greetings, i would like to work on your so4-oracle project! Allowing high-magnitude price inputs to process without rigorous bounds testing introduces a significant risk of silent integer overflow or precision truncation in fixed-point math operations, which could compromise the oracle's confidence intervals, and I have the specific Soroban/Rust fixed-point arithmetic testing and financial oracle development skills this issue requires.

I am highly comfortable with Rust, multi-precision numerical validation ($i128$ boundary testing), and testing invariant bounds for statistical algorithms. This will allow me to seamlessly implement the large price unit test within the test module inside oracle/src/prices.rs, map the mock price vectors smoothly up to the $1e9$ range to replicate extreme fixed-point values, and enforce strict assertions verifying that both min and max bounds remain positive and logically consistent under execution without encountering integer overflows.

Timeframe: 12 hours

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Praxhant97 to this issue.

[drips-wave]

Congratulations, @Praxhant97! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Praxhant97: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 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.

🌊 Happy Wave 🌊