feat(contract): implement reputation tests and LP token calculator

[JoyLight00]

Description

This Pull Request addresses the open source assignments for InsightArena, finalizing both #323 and #370. It cleans up the smart contract test logic and incorporates the crucial core AMM LP math.

Changes Made

1. Reputation Testing Framework (Resolves #323)

• Refactoring: Extracted the entire #[cfg(test)] inline module from contract/src/reputation.rs.
• New Test Module: Set up contract/tests/reputation_tests.rs with correct imports pointing to the exposed crate elements (use insightarena_contract::*). This aligns the codebase with idiomatic Rust integration test patterns.
• New Test logic: Added test_reputation_decay_over_time() to verify bounds and time calculations relative to Env::default().

2. LP Token Calculator (Resolves #370)

• Method Implementation: Implemented overflow-protected calculate_lp_tokens(deposit, liquidity, supply) internally within contract/src/liquidity.rs.
• AMM Math Protection: Handles the zero-state genesis initialization case precisely (1:1 mapping on first liquidity deposit) while ensuring strict proportional mapping (via multiplication bounds checking) for subsequent additions.
• Validation: Added four new mathematical assert queries ensuring perfect proportionality for first_deposit, second_deposit_equal, second_deposit_half, and second_deposit_double.

Verification Steps

• Formatted via cargo fmt.
• Validated tests and syntactic analysis (runs successfully).

Closes : #323
Closes : #370

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Project	Deployment	Actions	Updated (UTC)
insight-arena-4rll	Ready	Preview, Comment	Mar 29, 2026 6:50pm

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