Jasmine Skill
> Generates Jasmine tests in JavaScript. BDD-style framework with spies and async support. Use when user mentions "Jasmine", "jasmine.createSpy", "Jasmine spec".
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/LambdaTest/agent-skills --skill jasmine-skillThe instruction itself
9 sections, as written by the authorJasmine Testing Skill
Core Patterns
Basic Test
describe('Calculator', () => {
let calc;
beforeEach(() => { calc = new Calculator(); });
it('should add two numbers', () => {
expect(calc.add(2, 3)).toBe(5);
});
it('should throw on divide by zero', () => {
expect(() => calc.divide(10, 0)).toThrowError('Division by zero');
});
});
Matchers
expect(value).toBe(exact); // === strict
expect(value).toEqual(object); // Deep equality
expect(value).toBeTruthy();
expect(value).toBeFalsy();
expect(value).toBeNull();
expect(value).toBeUndefined();
expect(value).toBeDefined();
expect(value).toBeNaN();
expect(value).toBeGreaterThan(3);
expect(value).toBeCloseTo(0.3, 5);
expect(str).toContain('sub');
expect(str).toMatch(/pattern/);
expect(arr).toContain(item);
expect(fn).toThrow();
expect(fn).toThrowError('message');
// Negation
expect(value).not.toBe(other);
Spies
describe('UserService', () => {
let service, api;
beforeEach(() => {
api = jasmine.createSpyObj('api', ['get', 'post']);
service = new UserService(api);
});
it('fetches user from API', async () => {
api.get.and.returnValue(Promise.resolve({ name: 'Alice' }));
const user = await service.getUser(1);
expect(user.name).toBe('Alice');
expect(api.get).toHaveBeenCalledWith('/users/1');
expect(api.get).toHaveBeenCalledTimes(1);
});
});
// Spy on existing method
spyOn(obj, 'method').and.returnValue(42);
spyOn(obj, 'method').and.callThrough(); // Call original
spyOn(obj, 'method').and.throwError('err');
Async Testing
it('fetches data', async () => {
const data = await fetchData();
expect(data).toBeDefined();
});
// With done callback
it('fetches data', (done) => {
fetchData().then(data => {
expect(data).toBeDefined();
done();
});
});
// Clock control
beforeEach(() => { jasmine.clock().install(); });
afterEach(() => { jasmine.clock().uninstall(); });
it('handles timeout', () => {
const callback = jasmine.createSpy();
setTimeout(callback, 1000);
jasmine.clock().tick(1001);
expect(callback).toHaveBeenCalled();
});
Setup: npm install jasmine --save-dev && npx jasmine init
Run: npx jasmine or npx jasmine spec/calculatorSpec.js
Deep Patterns
See reference/playbook.md for production-grade patterns:
| Section | What You Get |
|---------|-------------|
| §1 Project Setup | jasmine.json, TypeScript, spec reporter config |
| §2 Spies — Complete API | spyOn, createSpyObj, callFake, returnValues, call tracking |
| §3 Async Testing | async/await, expectAsync, promise matchers |
| §4 Custom Matchers | Domain-specific matchers, asymmetric matchers |
| §5 Test Organization | Nested describe, shared state, focused/excluded |
| §6 Fetch & Module Mocking | globalThis.fetch spy, HTTP error handling |
| §7 Browser Testing | DOM creation, keyboard events, focus trapping with Karma |
| §8 CI/CD Integration | GitHub Actions with coverage, browser testing |
| §9 Debugging Table | 12 common problems with causes and fixes |
| §10 Best Practices | 14-item checklist for production Jasmine testing |
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How to use it
Take lambdatest/jasmine-skill from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.
The instructions reference npm, npx.
Without those the skill loads but fails at the first command.