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Generates Vitest tests in JavaScript/TypeScript with Vite-native speed. Jest-compatible API with ESM support and HMR.
Passed 21 of 22 test cases with the skill, and 20 of 22 without it.
1 fixed20 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
A test case the skill fixed. Same model, same prompt, with and without the skill.
By default, running the test command in terminal starts watch mode. What CLI argument forces a single non-watching test suite run in CI environments?
| Checked | Without skill | With skill |
|---|---|---|
| Uses npx vitest run | Missed | Passed |
The instructions your model reads when the skill loads.
Use this skill when you need generates Vitest tests in JavaScript/TypeScript with Vite-native speed. Jest-compatible API with ESM support and HMR. Use when user mentions "Vitest", "vi.mock", "vitest.config". Triggers on: "Vitest", "vi.mock", "vi.fn", "Vite test", "vitest config".
import { describe, it, expect, vi, beforeEach } from 'vitest';
import { Calculator } from './calculator';
describe('Calculator', () => {
let calc: Calculator;
beforeEach(() => { calc = new Calculator(); });
it('adds two numbers', () => {
expect(calc.add(2, 3)).toBe(5);
});
it('throws on divide by zero', () => {
expect(() => calc.divide(10, 0)).toThrow();
});
});
import { vi } from 'vitest';
// Mock module
vi.mock('./database', () => ({
getUser: vi.fn().mockResolvedValue({ name: 'Alice' }),
saveUser: vi.fn().mockResolvedValue(true),
}));
// Mock function
test cases passed, vs 20 / 22 without
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