CodeSampleX

Ejemplo

vitest 4.1.10: Differentiate mockReset, mockRestore, and mockClear lifecycle on vi.spyOn and vi.fn instances in Vitest

Muestra verificada para npm vitest 4.1.10: Differentiate mockReset, mockRestore, and mockClear lifecycle on vi.spyOn and vi.fn instances in Vitest. El…

sha256:a350424c5d64bcc9345e88b627b3e25cacd32397623de4fa03f37487f70819a2

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
3
Claves de firma que lo compilaron
3
Entorno declarado node linux x64 node node npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-16
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-18
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-09-08

Caso

HOW
Objetivo
Differentiate mockReset, mockRestore, and mockClear lifecycle on vi.spyOn and vi.fn instances in Vitest
Paquetes
Símbolos
  • vi.spyOn
  • vi.fn
  • mockReset
  • mockRestore
  • mockClear
Entorno
node
Creado
2026-08-16T12:43:29Z

Contrato

  1. assert mockReset on vi.spyOn reverts to initial method implementation instead of undefined while continuing to intercept and record calls
  2. assert mockRestore on vi.spyOn detaches the spy interceptor from target object and stops recording future calls
  3. assert mockClear resets call history but preserves custom mockReturnValue overrides
  4. assert mockReset on vi.fn with initial implementation restores the original function rather than undefined
  5. assert vi.spyOn on getter properties throws without explicit get accessor type argument
  6. assert vi.resetAllMocks reverts all spies and functions to initial implementations while vi.restoreAllMocks unhooks spies

Archivos

  • NOTES.md
  • csx.json
  • package-lock.json
  • package.json
  • test/contract.mjs

Descargar el artefacto de código fuente (tar.gz)

Código fuente

NOTES.md
# Notes on Vitest Spy and Mock Lifecycle

## `search_known_solution` Result
- `search_known_solution` returned a sample (`sha256:e949d296b4b86f64c795f4aaf4915e41f0e6d78206d3732bfffc80877456b1a3`) covering Vitest 4 environment resolution, docblock precedence over project configs, setupFiles DOM lifecycle, and `globals: true` symbol exposure.
- Searching for `vi.spyOn` and `vi.fn` mock reset and restore lifecycle returned `NO_SAFE_MATCH`.

## What a Naive Model Would Write
- A developer or model migrating from Jest assumes `mockReset()` clears calls and wipes out any underlying implementation to return `undefined`, confusing `mockReset()` with replacing the function.
- They also expect `vi.spyOn(target, 'getterProp')` to spy on getters without specifying `'get'`, and expect `mockRestore()` to behave identically to `mockReset()`.

## How the Wrong Version Fails
- A test suite relying on `mockReset()` to suppress side effects or return `undefined` silently continues executing the original method logic and tracking calls on the target object, causing tests relying on stubbed isolation to pass or fail silently with incorrect mock state.
csx.json
{"case":{"believed":"mockReset clears call records and replaces the mock implementation with an empty function returning undefined like Jest, rather than reverting to the initial implementation while keeping the spy active","caseId":"case:sha256:f6f47441129b19bcceea36b596df79c9fe3890c7ba315c4511f178bc569b21ef","contract":["assert mockReset on vi.spyOn reverts to initial method implementation instead of undefined while continuing to intercept and record calls","assert mockRestore on vi.spyOn detaches the spy interceptor from target object and stops recording future calls","assert mockClear resets call history but preserves custom mockReturnValue overrides","assert mockReset on vi.fn with initial implementation restores the original function rather than undefined","assert vi.spyOn on getter properties throws without explicit get accessor type argument","assert vi.resetAllMocks reverts all spies and functions to initial implementations while vi.restoreAllMocks unhooks spies"],"goal":"Differentiate mockReset, mockRestore, and mockClear lifecycle on vi.spyOn and vi.fn instances in Vitest","kind":"HOW","packages":["pkg:npm/vitest@4.1.10"],"schemaVersion":1,"symbols":["vi.spyOn","vi.fn","mockReset","mockRestore","mockClear"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","ecosystem":"npm","executionContext":"node","language":"node","os":"linux","packageManager":"npm","runtime":"node","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/vitest@4.1.10"],"schemaVersion":1,"symbols":["vi.spyOn","vi.fn","mockReset","mockRestore","mockClear"],"verifierAdapter":"node-typescript@1"}
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package.json
{
  "name": "csx-npm-vitest-api",
  "version": "1.0.0",
  "type": "module",
  "devDependencies": {
    "vitest": "4.1.10"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import { vi } from 'vitest';

// 1. assert mockReset on vi.spyOn reverts to initial method implementation instead of undefined while continuing to intercept and record calls
const calculator = {
  factor: 3,
  multiply(x) {
    return x * this.factor;
  },
};

const originalMultiply = calculator.multiply;
const multiplySpy = vi.spyOn(calculator, 'multiply');

multiplySpy.mockReturnValue(999);
assert.equal(calculator.multiply(4), 999, 'Mocked return value takes effect');
assert.equal(multiplySpy.mock.calls.length, 1, 'Invocation is recorded');

multiplySpy.mockReset();
assert.equal(multiplySpy.mock.calls.length, 0, 'mockReset clears call records');
assert.equal(calculator.multiply === multiplySpy, true, 'calculator.multiply remains wrapped by spy after mockReset');

const resetResult = calculator.multiply(4);
assert.equal(resetResult, 12, 'mockReset reverts to initial implementation (4 * 3 = 12), NOT undefined');
assert.equal(multiplySpy.mock.calls.length, 1, 'Spy continues intercepting and recording calls after mockReset');

// 2. assert mockRestore on vi.spyOn detaches the spy interceptor from target object and stops recording future calls
multiplySpy.mockRestore();
assert.equal(calculator.multiply === originalMultiply, true, 'mockRestore restores original unspied function reference');
assert.equal(calculator.multiply === multiplySpy, false, 'calculator.multiply is no longer the spy object');

const postRestoreResult = calculator.multiply(4);
assert.equal(postRestoreResult, 12, 'Original function executes normally');
assert.equal(multiplySpy.mock.calls.length, 0, 'mockRestore clears spy state and detached spy does not record future calls');

// 3. assert mockClear resets call history but preserves custom mockReturnValue overrides
const greeter = {
  greet(name) {
    return `Hello, ${name}`;
  },
};
const greetSpy = vi.spyOn(greeter, 'greet').mockReturnValue('Custom Greeting');
assert.equal(greeter.greet('Alice'), 'Custom Greeting');
assert.equal(greetSpy.mock.calls.length, 1);

greetSpy.mockClear();
assert.equal(greetSpy.mock.calls.length, 0, 'mockClear clears recorded calls');
assert.equal(greeter.greet('Bob'), 'Custom Greeting', 'mockClear preserves custom mockReturnValue implementation');
assert.equal(greetSpy.mock.calls.length, 1, 'New calls are recorded');
greetSpy.mockRestore();

// 4. assert mockReset on vi.fn with initial implementation restores the original function rather than undefined
const customAdder = vi.fn((a, b) => a + b);
customAdder.mockImplementation((a, b) => a * b);
assert.equal(customAdder(3, 4), 12, 'Overridden implementation active');

customAdder.mockReset();
assert.equal(customAdder.mock.calls.length, 0, 'Calls cleared by mockReset');
assert.equal(customAdder(3, 4), 7, 'mockReset reverts vi.fn back to (a, b) => a + b, NOT undefined');

const emptyMock = vi.fn();
emptyMock.mockReturnValue('temporary');
assert.equal(emptyMock(), 'temporary');
emptyMock.mockReset();
assert.equal(emptyMock(), undefined, 'vi.fn() without initial implementation resets to returning undefined');

// 5. assert vi.spyOn on getter properties throws without explicit get accessor type argument
const account = {
  _balance: 100,
  get balance() {
    return this?._balance ?? 100;
  },
  set balance(val) {
    this._balance = val;
  },
};

assert.throws(
  () => {
    vi.spyOn(account, 'balance');
  },
  {
    name: 'Error',
    message: /vi\.spyOn\(\) can only spy on a function\. Received number\./,
  },
  'vi.spyOn without accessor type fails on getter properties'
);

const balanceGetterSpy = vi.spyOn(account, 'balance', 'get');
balanceGetterSpy.mockReturnValue(9999);
assert.equal(account.balance, 9999, 'Getter spy overrides return value');
assert.equal(balanceGetterSpy.mock.calls.length, 1, 'Getter invocation is tracked');
balanceGetterSpy.mockRestore();
assert.equal(account.balance, 100, 'Restored getter returns underlying state');

const balanceSetterSpy = vi.spyOn(account, 'balance', 'set');
account.balance = 250;
assert.equal(balanceSetterSpy.mock.calls.length, 1, 'Setter invocation is tracked');
assert.deepEqual(balanceSetterSpy.mock.calls[0], [250], 'Setter received argument');
balanceSetterSpy.mockRestore();

// 6. assert vi.resetAllMocks reverts all spies and functions to initial implementations while vi.restoreAllMocks unhooks spies
const serviceA = {
  run(v) {
    return v * 10;
  },
};
const originalRun = serviceA.run;
const spyA = vi.spyOn(serviceA, 'run').mockReturnValue(0);
const standaloneFn = vi.fn((v) => v + 5).mockReturnValue(0);

assert.equal(serviceA.run(2), 0);
assert.equal(standaloneFn(2), 0);

vi.resetAllMocks();
assert.equal(serviceA.run(2), 20, 'vi.resetAllMocks reverts spy to initial method');
assert.equal(standaloneFn(2), 7, 'vi.resetAllMocks reverts vi.fn to initial implementation');
assert.equal(serviceA.run === spyA, true, 'vi.resetAllMocks leaves spy attached to serviceA');

vi.restoreAllMocks();
assert.equal(serviceA.run === originalRun, true, 'vi.restoreAllMocks restores original unspied method reference');
assert.equal(serviceA.run === spyA, false, 'serviceA.run is no longer the spy');

console.log('Contract passed: Vitest spy and mock lifecycle verified.');

Seeder de origen

csx-seed