Mocha Skill

Generates Mocha tests in JavaScript with Chai assertions and Sinon mocking. Use when user mentions "Mocha", "Chai", "sinon", "describe/it (not Jest)". Triggers on: "Mocha", "Chai", "sinon", "mocha test".

386 stars 76 forksTesting & QAOfficial

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add LambdaTest/agent-skills --skill mocha-skill

Manual install

git clone --depth 1 https://github.com/LambdaTest/agent-skills.git /tmp/agent-skills
mkdir -p ~/.claude/skills
cp -r /tmp/agent-skills/mocha-skill ~/.claude/skills/mocha-skill

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# Mocha Testing Skill

## Core Patterns

### Basic Test with Chai

```javascript
const { expect } = require('chai');

describe('Calculator', () => {
  let calc;
  beforeEach(() => { calc = new Calculator(); });

  it('should add two numbers', () => {
    expect(calc.add(2, 3)).to.equal(5);
  });

  it('should throw on divide by zero', () => {
    expect(() => calc.divide(10, 0)).to.throw('Division by zero');
  });
});
```

### Chai Assertions

```javascript
expect(value).to.equal(5);
expect(arr).to.have.lengthOf(3);
expect(obj).to.have.property('name');
expect(str).to.include('hello');
expect(fn).to.throw(Error);
expect(arr).to.deep.equal([1, 2, 3]);
expect(obj).to.deep.include({ name: 'Alice' });
```

### Sinon Mocking

```javascript
const sinon = require('sinon');

describe('UserService', () => {
  let sandbox;
  beforeEach(() => { sandbox = sinon.createSandbox(); });
  afterEach(() => { sandbox.restore(); });

  it('fetches user from API', async () => {
    const stub = sandbox.stub(api, 'get').resolves({ name: 'Alice' });
    const user = await userService.getUser(1);
    expect(user.name).to.equal('Alice');
    expect(stub.calledOnce).to.be.true;
  });
});
```

### Async Testing

```javascript
it('should fetch data', async () => {
  const data = await fetchData();
  expect(data).to.have.property('id');
});

it('callback style', (done) => {
  fetchData((err, data) => {
    expect(err).to.be.null;
    done();
  });
});
```

### Anti-Patterns

| Bad | Good | Why |

Read the full skill on GitHub

Details

Skill name: mocha-skill
Repository: LambdaTest/agent-skills
Path: mocha-skill/SKILL.md
License: MIT
Repo updated: 30 October 2026
Listed in: VoltAgent/awesome-agent-skills

FAQ

What does the Mocha Skill skill do?

How do I install the Mocha Skill skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add LambdaTest/agent-skills --skill mocha-skill. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Mocha Skill popular?

It lives in LambdaTest/agent-skills, which has 386 GitHub stars and 76 forks, and is included in 1 curated skill list.

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