golang-stretchr-testify Skill for Claude Code: Write Go Tests with testify

Makes Claude write and review Go tests with stretchr/testify: assert vs require, mocks and suites.

Installs: 40.2K; on skills.sh
Stars: 3.7K; on GitHub
Files: 2; besides SKILL.md
Updated: Nov 2026; last repo commit

golang-stretchr-testify teaches Claude the assert, require, mock and suite packages of testify. Its rules include using require for preconditions and assert for checks, passing arguments as (expected, actual), and always calling AssertExpectations on mocks.

It has Write mode and Review mode. It lists go and gotests as required programs, and bundles one reference file for mocks. It points to the testifylint linter for catching misuse.

Good for

Go developers writing unit tests with testify
Reviewers checking test code for testify misuse
Teams who want mocks and suites set up correctly

Install golang-stretchr-testify

Claude Code

Copy this prompt.

Install the golang-stretchr-testify skill in Claude Code. Run this command:

/plugin marketplace add samber/cc
/plugin install cc-skills-golang@samber

Then check that it loaded and tell me how to use it.

2
Paste it into Claude Code. It shows the change and asks before running it.

Pick one route, not several. The README says the skills cross-reference each other and a subset gives a partial and potentially inconsistent view, so the plugin or the whole-set CLI command is the better choice. The plugin installs the repo's 46 skill folders; its manifest declares no hooks, commands or MCP servers. Claude Code names plugin skills /plugin-name:skill-name, so after the plugin install the full name is /cc-skills-golang:golang-stretchr-testify. The samber/cc marketplace lists seven plugins; the second command installs only cc-skills-golang.

From the project README. Source.

What's in the skill

When it loads

Comprehensive guide to stretchr/testify for Golang testing. Covers assert, require, mock, and suite packages in depth. Use when writing tests with testify, creating mocks, setting up test suites, or choosing between assert and require. Covers testify assertions, mock expectations, argument matchers, call verification, suite lifecycle, and advanced patterns like Eventually, JSONEq, and custom matchers. Apply when the codebase imports github.com/stretchr/testify.

Sections in SKILL.md

assert vs require
Core Assertions
Advanced Assertions
testify/mock
testify/suite
Lifecycle
Example
Common Mistakes
Linters
Cross-References

Key facts

Author: samber (metadata.author in SKILL.md)
License: MIT (license field in SKILL.md)
Version: 1.3.1 (metadata.version in SKILL.md)
Installs on skills.sh: 40,196 as of 2026-11-02
GitHub stars: 3,749 for the whole samber/cc-skills-golang repo, 2026-11-02
Last repo commit: 2026-11-01
What is inside: 3 files including SKILL.md: 1 reference guide, an evals file. No scripts.
Needs: Programs named in the SKILL.md frontmatter: go, gotests
Works in: Designed for Claude Code, Codex or similar harness, and for projects using Golang (compatibility field in SKILL.md)

What it includes

Add new tests or mocks to a codebase
Uses testify as a complement to Go's testing package, with *testing.T as the entry point.
Runs code · Write mode
Audit existing test code for testify misuse
Checks the common mistakes list.
Read · Review mode
assert records a failure and continues; require stops the test
Rule: require for preconditions, assert for verifications, and never mix them at random.
Read · assert vs require
Expected comes first, then actual
Swapped order gives confusing diffs.
Read · Core and advanced assertions
Embed mock.Mock, use m.Called(), verify with AssertExpectations(t)
Matchers include mock.Anything and mock.MatchedBy. See references/mock.md.
Write · testify/mock
Suites with shared setup and teardown
Remember to call suite.Run(), or zero tests execute.
Write · testify/suite
Six mistakes, such as is.Equal on wrapped errors
Use ErrorIs for errors, and EqualExportedValues instead of comparing pointers.
Read · Common mistakes

From the official docs

Permissions

Low risk

Claude can edit your Go files and run go and git commands while this skill is active. Work on a branch and read the diff before you commit.

What it can do

Read your data
Create and change things
Delete things
Read-only mode

Watch out for

It edits files and runs commands in your project
The frontmatter lists Edit, Write and these shell commands: go:*, golangci-lint:*, git:*, gotests:*, godig:*, gopls:*. Work on a branch and read the diff before you commit. github.com
Claude may fetch web pages
The frontmatter lists WebFetch. Page text it reads goes into the conversation with your AI provider. github.com
The recommended plugin route installs the whole repo
The plugin route and the --all skills CLI command add all 46 skill folders in the repo, not only this one. The plugin manifest (.claude-plugin/plugin.json, version 2.0.1) declares a name, description, author, license and keywords, and lists no hooks, commands or MCP servers. The skills CLI docs say --all installs every skill into every agent it supports without prompts. github.com

Technical details

Talks to	Web fetch/search through your assistant (WebFetch)
Sign-in and keys	SKILL.md names no account or API key.
Scopes	Reads and edits files in your Go project Runs the shell commands listed in the allowed-tools field: go:, golangci-lint:, git:, gotests:, godig:, gopls: Frontmatter also allows MCP tools: mcp__context7__resolve-library-id, mcp__context7__query-docs, mcp__gopls__*

Questions

What does golang-stretchr-testify do?

It makes Claude write and review Go tests with testify: choose between assert and require, build mocks with testify/mock, group tests in suites and avoid common mistakes such as swapped argument order.

How do I install golang-stretchr-testify?

Install the whole golang set, not only this skill. The README calls the skills atomic, cross-referencing units and says a partial install gives a potentially inconsistent view. The install box lists the Claude Code plugin (/plugin marketplace add samber/cc, then /plugin install cc-skills-golang@samber), the skills CLI for the whole set or for this skill alone, and the README's Codex, Gemini CLI, Cursor and OpenCode routes. The README documents no Claude app route, so none is listed.

Do I need the other golang skills with golang-stretchr-testify?

Installing the set is the safer choice. SKILL.md hands neighboring topics to other skills: golang-testing, golang-lint, golang-pkg-go-dev, golang-gopls. This skill sits in the README's Tools list, and the README's advice to install together is written for its general-purpose skills, but the whole-set install gives you every skill this one points to.

What does golang-stretchr-testify need on my machine?

The frontmatter names these programs: go, gotests. SKILL.md names no API key or account.

Is golang-stretchr-testify safe?

It is instruction text and reference files, and the folder bundles no scripts. When you use it, Claude can edit files and run go, golangci-lint, git, gotests, godig and gopls commands in your project, as its frontmatter allows. The frontmatter also lists WebFetch, so pages Claude opens are read into your conversation. Work on a branch, read the diff and approve commands you do not recognize.

golang-stretchr-testify vs golang-testing?

This skill is only about the testify library. SKILL.md points to golang-testing for general test patterns, table-driven tests and CI, and to golang-lint for testifylint configuration.

Does golang-stretchr-testify work in Codex, Cursor or the Claude app?

The SKILL.md compatibility field says it is designed for Claude Code, Codex or a similar harness, and the README says the skills are built for Claude Code, Codex, Gemini, Copilot, Antigravity and Cursor. The install box covers Claude Code, Codex, Gemini CLI, Cursor, OpenCode and the skills CLI. The README documents no Claude app route.

Information

updated Nov 2, 2026

Repository: samber/cc-skills-golang
Folder: skills/golang-stretchr-testify

samber/cc-skills-golang skills.sh

Sources

Docs, issue trackers and discussions this page is built from.

Show all 6

cc-skills-golang README · github.com
skills CLI commands · github.com
cc-skills-golang plugin.json · github.com
samber/cc marketplace.json · github.com
Claude Code skills · code.claude.com
golang-stretchr-testify SKILL.md · github.com