smart-contract-testing SKILL.md skillA
smart-contract-testing from nirholas/three.ws is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nirholas/three.ws/smart-contract-testing@git:20260501.87cefc9Pins git:20260501.87cefc9 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nirholas/three.ws
- Path
data/skills/development/smart-contract-testing/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260501.87cefc9, committed May 1, 2026
- Size
- 5,712 bytes
- Repository stars
- 269
- License
- Apache-2.0
Guide for testing smart contracts using Foundry and Hardhat, covering unit tests, fuzz testing, invariant testing, fork testing, and gas benchmarking.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Smart Contract Testing
## When to use this skill
Use when the user asks about:
- Writing tests for smart contracts
- Setting up a testing framework (Foundry or Hardhat)
- Fuzz testing or invariant testing strategies
- Fork testing against mainnet state
- Gas benchmarking and optimization verification
- Debugging failing contract tests
## Testing Framework Selection
### Foundry vs Hardhat
| Feature | Foundry | Hardhat |
|---------|---------|---------|
| Language | Solidity | JavaScript/TypeScript |
| Speed | Very fast (native) | Slower (JS runtime) |
| Fuzzing | Built-in | Requires plugins |
| Fork testing | Built-in | Built-in |
| Debugging | forge debug, traces | console.sol, traces |
| Ecosystem | Growing rapidly | Mature, large plugin ecosystem |
Recommendation: Use Foundry for new projects. Use Hardhat when you need complex JS scripting or specific Hardhat plugins.
## Testing with Foundry
### 1. Unit Test Structure
Follow this pattern for each test:
```solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
import {Test} from "forge-std/Test.sol";
import {MyContract} from "../src/MyContract.sol";
contract MyContractTest is Test {
…Read the whole file at its exact version.
How to install
mdr add nirholas/three.ws/smart-contract-testing@sha256:f2686ee6864ad7b2The line at the top of this page pins the label git:20260501.87cefc9, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ukwl2outttfcmeyn)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on May 1, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5712 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
nirholas/three.ws · 269 stars · license Apache-2.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ukwl2outttfcmeyn GET https://markdownregistry.com/api/v1/resolve?ref=nirholas/three.ws/smart-contract-testing GET https://markdownregistry.com/api/v1/blob/f2686ee6864ad7b28fa57f4f974cb08d0d4dbacd10b0d62aa787da81da24b375
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.