How do I install the Write Tests skill?

Run npx skillmds@latest add hoangsonww/write-tests in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Write Tests skill do?

Add Swift Testing coverage in Tests/Domain, Tests/Invariants, Tests/Integration, or package-local suites. Use when adding behaviour, reproducing a bug, or the user asks for more tests. It is listed under Integrations & APIs on SkillMD.

Is Write Tests safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Write Tests?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Write Tests free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Write Tests?

hoangsonww (@hoangsonww) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Write Tests by hoangsonww — Agent Skill

Name: Write Tests
Author: hoangsonww

File contents

Write tests

Swift Testing only (@Test, #expect, @Suite). No new XCTest modules.

Where it goes

Kind	Path
Example-based public API	`Tests/Domain/`
Seeded invariant ("for any input")	`Tests/Invariants/`
Golden fixtures, live capture, pipelines	`Tests/Integration/`
Package-private details	`Packages/<Name>/Tests/`

DiffuseTestSupport (Tests/Support) has SnapshotBuilder, TestSchema, FakeCapabilityFactory, SeededGenerator, SnapshotSummary.stub, TemporaryLibrary.

Rules

Prefer fakes over live hardware. Integration live-capture tests are the exception.
Deterministic clocks (FixedTimeSource) and ids. No Date() or UUID() in assertions unless the test is specifically about allocation.
If you change collector schema, run skill fixtures and explain the diff.
After writing tests: swift test --parallel then ./Scripts/coverage.sh.

Shape

One behaviour per @Test with a sentence name ("Pinned snapshots survive the age window"). Invariants take arguments: of seeds and mention the seed in the failure message.

Frequently asked questions

Write Tests