ENS Resolution Tests

Warning

This repository is not yet ready for use. It is a work in progress.

This repository provides a stable, reproducible set of test cases for validating ENS resolution implementations. Library maintainers and integrators can use these tests to ensure their ENS support is complete and correct.

Note: These resolution tests are specifically for testing usage of the Universal Resolver for ENS V2 readiness.

Test Cases

See test-cases.json for full details and expected values. It tests various resolution scenarios including:

• Forward onchain resolution (address, text, contenthash)
• Forward offchain resolution (CCIP-Read)
• Reverse resolution (L1 and L2)
• Support for all valid name types (.eth, DNS, Unicode, etc.)

Library Coverage

Any library and app can use the above tests. For organization, we also run the tests and report coverage for the following libraries.

TypeScript

• viem v2.x
• viem v1.x
• ethers v6.x
• ethers v5.x
• @ensdomains/ensjs v3.x
• web3.js v4.x

Python

• web3.py
• ens-py

Rust

• alloy
• ethers-rs

Go

• go-ens

Deployments

Custom resolvers are deployed to test specific resolution scenarios.

Name	Chain	Address
URTestResolver.sol	Mainnet	0xDE0c1269547dba2233f833DC1d9A7E586b4b199c
URTestResolver.sol	Sepolia	0x0887c5f652e81b8fb95359b04058a14b0fd0a9a9

Local Development

# Clone the repo
git clone https://github.com/ensdomains/resolution-tests.git
cd resolution-tests

# Copy env and set RPC URL
cp .env.example .env
# Edit .env and set RPC_URL

# Install all dependencies (workspace)
bun install

# Run all tests
bun run test

# Run tests for specific language
bun run test:typescript

After tests complete, a feature support table is displayed showing pass/fail status for each test case across all libraries. Results are automatically saved to results/latest.md.

Adding a New TypeScript Library

1. Create a new directory: packages/{library-version}/
2. Add a package.json (will be auto-discovered by bun workspaces)
3. Import shared types and helpers:

   import { getTestCasesByCategory, type TestResult } from "../../../shared";

4. Output results to results.json in the package directory
5. Run bun install from root to link the new package

Results Format

Each library must output a results.json file:

{
  "library": "viem",
  "version": "2.21.0",
  "language": "typescript",
  "timestamp": "2025-01-16T12:00:00Z",
  "results": [
    {
      "caseId": "forward-eth-onchain",
      "passed": true,
      "actual": "0xeE9eeaAB0Bb7D9B969D701f6f8212609EDeA252E",
      "error": null,
      "durationMs": 150
    }
  ]
}

Operational Notes

• Test names use various .eth names owned by ENS DevRel team or known stable names
• The DevRel team Safe (devrel.enslabs.eth) has coldwallet.ens.eth as a recoverer
• Test data is designed to remain stable over time