Tests: rpc initial setup and rpc tests phase 1

[kollegian]

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Testing performed to validate your change

[cursor]

PR Summary

Low Risk
Additive integration-test and tooling only; no production RPC or node logic changes. CI/runtime cost and env deps (docker, geth) are the main operational considerations.

Overview
Introduces a self-contained integration_test/rpc_tests module that compares Sei’s EVM JSON-RPC to a local geth --dev reference (optional Hardhat mainnet fork for shape-only checks), without importing shared integration helpers.

Harness: Mocha + tsx configs for sequential bootstrap vs sharded runs, env-driven endpoints, compile-only Hardhat, gitignored runtime state, and docs for test:rpc / test:rpc:full (docker cluster + geth + mochawesome merge).

Bootstrap (_start/00_bootstrap.spec.ts): Verifies Sei + geth, records chain/block anchors, funds admin, deploys TestERC20, SimpleAccount7702, RealGasBurner on Sei, mirrors ERC20 on geth, pre-funds a signer pool, writes runtime/runtime.json for parallel specs.

Phase 1 eth_* specs (happy path, schema vs geth, empty/null, raw JSON-RPC errors): eth_accounts, eth_blockNumber, eth_chainId, eth_coinbase (fee_collector / sei_*), eth_call (historical state, overrides, staking precompile, EIP-7702, labeled geth divergences), eth_estimateGas, eth_feeHistory, eth_gasPrice (fee-market burns + documented Sei vs geth pricing differences).

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 29, 2026, 3:04 PM

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 3 potential issues.

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[cursor]

Debug console.log left in test code

Low Severity

A console.log(body) statement is left in the "keyless node returns []" test. This dumps the full raw JSON-RPC response body to stdout on every run, cluttering test output and potentially leaking response details into CI logs.

 

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[cursor]

Revert data assertion mismatches TestERC20 contract output

Medium Severity

The test asserts err.data equals 0x96c6fd1e..., but the TestERC20 contract uses require(balanceOf[from] >= value, "ERC20: insufficient balance") with a string message. This produces Error(string) revert data with selector 0x08c379a0, not 0x96c6fd1e. The custom-error require syntax is a different overload (Solidity 0.8.26+ via-ir only) and is not used here. This assertion will fail at runtime.

 

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.21%. Comparing base (8567422) to head (2a9e78a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3520      +/-   ##
==========================================
- Coverage   59.03%   58.21%   -0.82%     
==========================================
  Files        2199     2129      -70     
  Lines      182207   174079    -8128     
==========================================
- Hits       107569   101346    -6223     
+ Misses      64975    63729    -1246     
+ Partials     9663     9004     -659     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

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