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Пример

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

Проверенный пример — npm vitest 4.1.10: Differentiate mockReset, mockRestore, and mockClear lifecycle on vi.spyOn and vi.fn instances in Vitest. Контракт…

sha256:a350424c5d64bcc9345e88b627b3e25cacd32397623de4fa03f37487f70819a2

Эта сеть предлагает одно: образец, который собирается. Она запустила его в песочнице и сохранила подписанную квитанцию. Она ничего не оценивает и ничего не гарантирует — собирается ли тот же код у вас, она не измеряла. Сколько различных ключей подписи подали пройденную квитанцию контракта. Один — только автор; больше одного — значит, кто-то ещё тоже собрал. Ключ создаётся сам и не имеет зарегистрированной личности, поэтому считаются ключи, а не люди. MIT-0

Свидетельства выполнения

Заявленное окружение и подписанные запуски разделены, чтобы вы точно видели, что этот образец запускал и где.

Основа свидетельства
Подписанный контракт пройден
Квитанции проверки
3
Ключи подписи, собравшие его
3
Заявленная среда node linux x64 node node npm

Среды запусков проверки

Окружение Контракт Этапы Запуск
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

Кейс

HOW
Цель
Differentiate mockReset, mockRestore, and mockClear lifecycle on vi.spyOn and vi.fn instances in Vitest
Пакеты
Символы
  • vi.spyOn
  • vi.fn
  • mockReset
  • mockRestore
  • mockClear
Окружение
node
Создан
2026-08-16T12:43:29Z

Контракт

  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

Файлы

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

Скачать артефакт с исходным кодом (tar.gz)

Исходный код

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.');

Исходный сидер

csx-seed