mocha-skill

Name: mocha-skill
Author: LambdaTest

335stars67forks

How to install mocha-skill?

lambdatest/agent-skills/mocha-skill

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

Installs into the current project.

Summary

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".

Files · 1

View on GitHub

SKILL.md

1	# Mocha Testing Skill
2
3	## Core Patterns
4
5	### Basic Test with Chai
6
7	```javascript
8	const { expect } = require('chai');
9
10	describe('Calculator', () => {
11	let calc;
12	beforeEach(() => { calc = new Calculator(); });
13
14	it('should add two numbers', () => {
15	expect(calc.add(2, 3)).to.equal(5);
16	});
17
18	it('should throw on divide by zero', () => {
19	expect(() => calc.divide(10, 0)).to.throw('Division by zero');
20	});
21	});
22	```
23
24	### Chai Assertions
25
26	```javascript
27	expect(value).to.equal(5);
28	expect(arr).to.have.lengthOf(3);
29	expect(obj).to.have.property('name');
30	expect(str).to.include('hello');
31	expect(fn).to.throw(Error);
32	expect(arr).to.deep.equal([1, 2, 3]);
33	expect(obj).to.deep.include({ name: 'Alice' });
34	```
35
36	### Sinon Mocking
37
38	```javascript
39	const sinon = require('sinon');
40
41	describe('UserService', () => {
42	let sandbox;
43	beforeEach(() => { sandbox = sinon.createSandbox(); });
44	afterEach(() => { sandbox.restore(); });
45
46	it('fetches user from API', async () => {
47	const stub = sandbox.stub(api, 'get').resolves({ name: 'Alice' });
48	const user = await userService.getUser(1);
49	expect(user.name).to.equal('Alice');
50	expect(stub.calledOnce).to.be.true;
51	});
52	});
53	```
54
55	### Async Testing
56
57	```javascript
58	it('should fetch data', async () => {
59	const data = await fetchData();
60	expect(data).to.have.property('id');
61	});
62
63	it('callback style', (done) => {
64	fetchData((err, data) => {
65	expect(err).to.be.null;
66	done();
67	});
68	});
69	```
70
71	### Anti-Patterns
72
73	\| Bad \| Good \| Why \|
74	\|-----\|------\|-----\|
75	\| Missing `done()` \| Use async/await \| Hanging tests \|
76	\| No sandbox \| `sinon.createSandbox()` \| Stubs leak \|
77	\| Arrow in `describe` \| Regular function for `this.timeout()` \| Context \|
78
79	## Quick Reference
80
81	\| Task \| Command \|
82	\|------\|---------\|
83	\| Run all \| `npx mocha` \|
84	\| Watch \| `npx mocha --watch` \|
85	\| Grep \| `npx mocha --grep "login"` \|
86	\| Timeout \| `npx mocha --timeout 10000` \|
87	\| Recursive \| `npx mocha --recursive` \|
88
89	## Setup: `npm install mocha chai sinon --save-dev`
90
91	## Deep Patterns → `reference/playbook.md`
92
93	\| § \| Section \| Lines \|
94	\|---\|---------\|-------\|
95	\| 1 \| Production Configuration \| mocharc, NYC coverage, TypeScript \|
96	\| 2 \| Testing with Chai + Sinon \| Stubs, spies, assertions \|
97	\| 3 \| Advanced Sinon Patterns \| Fake timers, nock HTTP, sequential \|
98	\| 4 \| Async Patterns \| Promise, await, callback, events \|
99	\| 5 \| Hooks & Test Organization \| Lifecycle, nesting, grep tags \|
100	\| 6 \| Custom Reporters & Plugins \| Reporter class, root hooks \|
101	\| 7 \| Express/API Testing \| Supertest integration \|
102	\| 8 \| CI/CD Integration \| GitHub Actions, services \|
103	\| 9 \| Debugging Quick-Reference \| 10 common problems \|
104	\| 10 \| Best Practices Checklist \| 13 items \|

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mocha-skill

335stars67forks

View on GitHub

How to install mocha-skill?

lambdatest/agent-skills/mocha-skill

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

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Mocha Testing Skill
2
3	## Core Patterns
4
5	### Basic Test with Chai
6
7	```javascript
8	const { expect } = require('chai');
9
10	describe('Calculator', () => {
11	let calc;
12	beforeEach(() => { calc = new Calculator(); });
13
14	it('should add two numbers', () => {
15	expect(calc.add(2, 3)).to.equal(5);
16	});
17
18	it('should throw on divide by zero', () => {
19	expect(() => calc.divide(10, 0)).to.throw('Division by zero');
20	});
21	});
22	```
23
24	### Chai Assertions
25
26	```javascript
27	expect(value).to.equal(5);
28	expect(arr).to.have.lengthOf(3);
29	expect(obj).to.have.property('name');
30	expect(str).to.include('hello');
31	expect(fn).to.throw(Error);
32	expect(arr).to.deep.equal([1, 2, 3]);
33	expect(obj).to.deep.include({ name: 'Alice' });
34	```
35
36	### Sinon Mocking
37
38	```javascript
39	const sinon = require('sinon');
40
41	describe('UserService', () => {
42	let sandbox;
43	beforeEach(() => { sandbox = sinon.createSandbox(); });
44	afterEach(() => { sandbox.restore(); });
45
46	it('fetches user from API', async () => {
47	const stub = sandbox.stub(api, 'get').resolves({ name: 'Alice' });
48	const user = await userService.getUser(1);
49	expect(user.name).to.equal('Alice');
50	expect(stub.calledOnce).to.be.true;
51	});
52	});
53	```
54
55	### Async Testing
56
57	```javascript
58	it('should fetch data', async () => {
59	const data = await fetchData();
60	expect(data).to.have.property('id');
61	});
62
63	it('callback style', (done) => {
64	fetchData((err, data) => {
65	expect(err).to.be.null;
66	done();
67	});
68	});
69	```
70
71	### Anti-Patterns
72
73	\| Bad \| Good \| Why \|
74	\|-----\|------\|-----\|
75	\| Missing `done()` \| Use async/await \| Hanging tests \|
76	\| No sandbox \| `sinon.createSandbox()` \| Stubs leak \|
77	\| Arrow in `describe` \| Regular function for `this.timeout()` \| Context \|
78
79	## Quick Reference
80
81	\| Task \| Command \|
82	\|------\|---------\|
83	\| Run all \| `npx mocha` \|
84	\| Watch \| `npx mocha --watch` \|
85	\| Grep \| `npx mocha --grep "login"` \|
86	\| Timeout \| `npx mocha --timeout 10000` \|
87	\| Recursive \| `npx mocha --recursive` \|
88
89	## Setup: `npm install mocha chai sinon --save-dev`
90
91	## Deep Patterns → `reference/playbook.md`
92
93	\| § \| Section \| Lines \|
94	\|---\|---------\|-------\|
95	\| 1 \| Production Configuration \| mocharc, NYC coverage, TypeScript \|
96	\| 2 \| Testing with Chai + Sinon \| Stubs, spies, assertions \|
97	\| 3 \| Advanced Sinon Patterns \| Fake timers, nock HTTP, sequential \|
98	\| 4 \| Async Patterns \| Promise, await, callback, events \|
99	\| 5 \| Hooks & Test Organization \| Lifecycle, nesting, grep tags \|
100	\| 6 \| Custom Reporters & Plugins \| Reporter class, root hooks \|
101	\| 7 \| Express/API Testing \| Supertest integration \|
102	\| 8 \| CI/CD Integration \| GitHub Actions, services \|
103	\| 9 \| Debugging Quick-Reference \| 10 common problems \|
104	\| 10 \| Best Practices Checklist \| 13 items \|

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