jasmine-skill
Generates Jasmine tests in JavaScript. BDD-style framework with spies and async support. Use when user mentions "Jasmine", "jasmine.createSpy", "toHaveBeenCalled". Triggers on: "Jasmine", "jasmine test", "createSpy", "Jasmine spec".
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/lambdatest/agent-skills --skill jasmine-skill- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads jasmine-skill automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Jasmine 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 |
FAQ
What does the jasmine-skill skill do?
Generates Jasmine tests in JavaScript. BDD-style framework with spies and async support. Use when user mentions "Jasmine", "jasmine.createSpy", "toHaveBeenCalled". Triggers on: "Jasmine", "jasmine test", "createSpy", "Jasmine spec".
How do I install jasmine-skill?
Run npx skills add https://github.com/lambdatest/agent-skills --skill jasmine-skill in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/jasmine-skill/ (personal) or .claude/skills/jasmine-skill/ (project).
Which AI agents can use jasmine-skill?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is jasmine-skill safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains jasmine-skill?
It is published by lambdatest in lambdatest/agent-skills. It has 227 recorded installs.
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