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Apply when writing unit tests with Jest: assertions, mocking, async tests, and test organization.
默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。
决定是否安装前，请先阅读 SKILL.md，以及 SkillsMP 当前展示的配套文件。
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
直接命令不会经过审查 Prompt；运行前请先检查来源。
npx skills add https://github.com/ForceInjection/domain-driven-design-skills --skill testing-jest命令会保持在同一行。复制前请横向滚动并检查完整内容。
想先保存到本地？可下载 SkillsMP 当前能够提供的文件。
Conduct deep academic research for philosophy, neuroscience, cognitive science, and theoretical computer science (computability, complexity, AI theory, logic). Use when user asks to: research academic topics, find scholarly papers, conduct literature reviews, analyze citations, synthesize research findings, explore philosophical arguments, investigate consciousness/cognition, study computability/decidability/Turing machines, or analyze academic debates. Triggers on: 'research papers', 'literature review', 'academic sources', 'scholarly articles', 'philosophy of mind', 'computability theory', 'neuroscience studies', 'find papers on', 'what does the research say'.
Create clear action plans with steps, success criteria, and risk awareness. Use before implementing features, making changes, starting projects, or anytime you need a roadmap to success. Triggers on "plan this", "how should we approach", "what's the strategy", "steps to complete", or when facing complex multi-step work.
Add keyboard navigation to a feature using CommandRegistryService. Use when implementing keyboard shortcuts, vim-style navigation, or hotkeys for a page or component.
基于 SOC 职业分类
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| name | testing-jest |
| description | Apply when writing unit tests with Jest: assertions, mocking, async tests, and test organization. |
Apply when writing unit tests with Jest: assertions, mocking, async tests, and test organization.
// Source: https://jestjs.io/docs/getting-started
describe('Calculator', () => {
describe('add', () => {
it('should add two positive numbers', () => {
expect(add(2, 3)).toBe(5);
});
it('should handle negative numbers', () => {
expect(add(-1, 5)).toBe(4);
});
});
});
// Source: https://jestjs.io/docs/expect
// Equality
expect(value).toBe(5); // Strict ===
expect(obj).toEqual({ a: 1 }); // Deep equality
expect(value).toBeNull();
expect(value).toBeDefined();
// Truthiness
expect(value).toBeTruthy();
expect(value).toBeFalsy();
// Numbers
expect(value).toBeGreaterThan(3);
expect(value).toBeCloseTo(0.3, 5); // Floating point
// Strings
expect(str).toMatch(/pattern/);
// Arrays/Objects
expect(array).toContain('item');
expect(obj).toHaveProperty('key', 'value');
// Errors
expect(() => fn()).toThrow('error message');
expect(() => fn()).toThrow(CustomError);
// Source: https://jestjs.io/docs/mock-functions
// Mock function
const mockFn = jest.fn();
mockFn.mockReturnValue(42);
mockFn.mockResolvedValue({ data: [] }); // Async
// Verify calls
expect(mockFn).toHaveBeenCalled();
expect(mockFn).toHaveBeenCalledWith('arg1', 'arg2');
expect(mockFn).toHaveBeenCalledTimes(2);
// Mock module
jest.mock('./api', () => ({
fetchUser: jest.fn().mockResolvedValue({ id: '1', name: 'Test' }),
}));
// Source: https://jestjs.io/docs/asynchronous
// Async/await (preferred)
it('should fetch data', async () => {
const data = await fetchData();
expect(data).toEqual({ id: 1 });
});
// Resolves/Rejects
it('should resolve with data', async () => {
await expect(fetchData()).resolves.toEqual({ id: 1 });
});
it('should reject with error', async () => {
await expect(failingFn()).rejects.toThrow('Network error');
});
// Source: https://jestjs.io/docs/setup-teardown
describe('Database tests', () => {
let db: Database;
beforeAll(async () => {
db = await createTestDatabase();
});
afterAll(async () => {
await db.close();
});
beforeEach(async () => {
await db.clear();
});
it('should insert record', async () => {
await db.insert({ id: 1 });
expect(await db.count()).toBe(1);
});
});
// Source: https://jestjs.io/docs/snapshot-testing
it('should match snapshot', () => {
const component = render(<Button>Click</Button>);
expect(component).toMatchSnapshot();
});
// Inline snapshot
expect(format(date)).toMatchInlineSnapshot(`"2025-01-10"`);