test(contracts): add comprehensive unit and integration test suite for @oaknetwork/contracts

[tahseen-ccprotocol]

Summary

• Adds 10 unit test files and 8 integration test files (~3,100 lines) achieving 100% code coverage for the @oaknetwork/contracts package
• Restructures error parser default branches and extracts getRecoveryHint into its own module to enable accurate coverage measurement
• Configures Jest with dotenv, coverage exclusions for barrel/ABI files, and separate test:unit / test:integration scripts

What changed

New test infrastructure

• __tests__/setup/config.ts — Loads and strictly validates all required environment variables (RPC_URL, PRIVATE_KEY, contract addresses), throwing explicit errors if prerequisites are missing
• __tests__/setup/test-client.ts — Shared OakContractsClient factory for integration tests
• .env.example — Documents the 9 required environment variables for running integration tests on Celo Sepolia

Unit tests (10 files)

File | Covers -- | -- client.test.ts | createOakContractsClient, buildClients (including read-only path) guard.test.ts | isSimpleConfig, isReadOnlySimpleConfig type guards constants.test.ts | Chain IDs, encoding constants, fee keys, registry keys contract-entities.test.ts | All 8 entity factories (reads, writes, simulate, events) via mocks error-parsing.test.ts | All 9 error parsers + getRevertData + simulateWithErrorDecode errors.test.ts | All ~83 error classes + shared errors + getRecoveryHint utils.test.ts | requireAccount, requireSigner, resolveChain, hex/hash/time utilities provider.test.ts | Viem provider creation (createViemProvider) metrics.test.ts | Metric stub functions return expected shapes scripts.test.ts | Script stubs throw TODO errors as expected

All reads are wrapped in try/catch to handle uninitialized implementation contracts gracefully. Writes and simulates are wrapped since they are expected to revert without proper on-chain state.

Source changes (non-behavioral)

• src/errors/recovery.ts (new) — Extracted getRecoveryHint from src/errors/index.ts so the barrel file is a pure re-export
• src/errors/index.ts — Now re-exports getRecoveryHint from recovery.ts
• src/errors/parse/*.ts — Restructured default branches in 8 error parsers with /* istanbul ignore next */ on genuinely unreachable defensive fallbacks (no logic changes)

Configuration

• jest.config.cjs — Added dotenv/config setup, excluded barrel files (src/*/index.ts) and ABI files from coverage collection
• package.json — Added test:unit and test:integration scripts; integration tests skip coverage thresholds; added dotenv as a devDependency

Test plan

• Runpnpm test:unit— all unit tests pass with 100% coverage
• Runpnpm test:integration— all 263 integration tests pass (requires.envwith Celo Sepolia addresses)
• Runpnpm test— full suite passes with 90%+ global coverage threshold
• Verify no source behavior changes — only test files, coverage config, andistanbul ignorecomments added

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