Solidity testing

Skill 0xlayerghost/solidity-agent-kit/skills/solidity-testing

Agent skills for Solidity & DeFi development with Foundry. Security, testing, deployment — all in one kit.

Install

npx -y skills add 0xlayerghost/solidity-agent-kit --skill solidity-testing

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[AUTO-INVOKE] MUST be invoked BEFORE writing or modifying any test files (*.t.sol). Covers test structure, naming conventions, coverage requirements, fuzz testing, and Foundry cheatcodes. Trigger: any task involving creating, editing, or running Solidity tests.

SKILL.md

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Testing Standards

Language Rule

Always respond in the same language the user is using. If the user asks in Chinese, respond in Chinese. If in English, respond in English.

Test Organization

One test contract per source contract: MyToken.sol → MyToken.t.sol
File location: All tests in test/ directory
Naming: test_<feature>_<scenario> for passing tests, testFail_<feature>_<scenario> for expected reverts
- Example: test_transfer_revertsWhenInsufficientBalance
- Example: test_stake_updatesBalanceCorrectly
Independence: Each test must run in isolation — use setUp() for shared state, no cross-test dependencies
Filtering: Support --match-test and --match-contract for targeted runs

Coverage Requirements

Every core function must have tests covering:

Scenario	What to verify
Happy path	Standard input → expected output, correct state changes
Permission checks	Unauthorized caller → `vm.expectRevert` with correct error
Boundary conditions	Zero values, max values (`type(uint256).max`), off-by-one
Failure scenarios	Every `require` / `revert` / custom error path
State changes	Storage updates, balance changes, event emissions (`vm.expectEmit`)
Edge cases	Empty arrays, duplicate calls, self-transfers

Foundry Cheatcodes Quick Reference

Cheatcode	Usage
`vm.prank(addr)`	Next call from `addr`
`vm.startPrank(addr)`	All calls from `addr` until `vm.stopPrank()`
`vm.warp(timestamp)`	Set `block.timestamp`
`vm.roll(blockNum)`	Set `block.number`
`vm.deal(addr, amount)`	Set ETH balance
`vm.expectRevert(error)`	Next call must revert with specific error
`vm.expectEmit(true,true,false,true)`	Verify event emission (topic checks)
`vm.record()` / `vm.accesses()`	Track storage reads/writes
`makeAddr("name")`	Create labeled address for readable traces

Fuzz Testing Rules

All math-heavy and fund-flow functions must have fuzz tests
Pattern: function testFuzz_<name>(uint256 amount) public
Use vm.assume() to constrain inputs: vm.assume(amount > 0 && amount < MAX_SUPPLY);
Default runs: 256 — increase to 10,000+ for critical functions: forge test --fuzz-runs 10000

Common Commands

# Run all tests
forge test

# Run specific test function
forge test --match-test test_transfer

# Run specific test contract
forge test --match-contract MyTokenTest

# Verbose output with full trace
forge test -vvvv

# Gas report
forge test --gas-report

# Fuzz with more runs
forge test --fuzz-runs 10000

# Test coverage
forge coverage

# Coverage with report
forge coverage --report lcov