---
name: jasmine-skill-38439207b4ca
description: >
  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".
languages:
  - JavaScript
  - TypeScript
category: unit-testing
license: MIT
metadata:
  author: TestMu AI
  version: "1.0"
---

# Jasmine Testing Skill

## Core Patterns

### Basic Test

```javascript
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

```javascript
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

```javascript
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

```javascript
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 |


---
Source attribution: LambdaTest
Original project: https://github.com/LambdaTest/agent-skills
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2026 Gabriel Moreira

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: LambdaTest
Original project: https://github.com/LambdaTest/agent-skills
Attribution basis: Upstream repository explicitly recorded in package mirror path

Fields of work: Development & Engineering
Roles: Backend Developer, DevOps / SRE, Frontend Developer, Full-Stack Developer, QA / Test Engineer
Specialties: Cross Platform, Testing
Tools: Jasmine, Npm
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: eac4c3b1a9dfa72e4ecab4f51299610fa8470e1edfececca690597871948af36