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vitest 4.1.10: Run a real vitest suite with no network, and know which of its matchers disagree with each other

検証済みサンプル — npm vitest 4.1.10: Run a real vitest suite with no network, and know which of its matchers disagree with each other. node 22 · linux alpine/x64 …

sha256:6c28ffd780aef897dcac706acedb270bbeded523f0b0570d4755789de89cb4ab

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
2
ビルドした署名鍵
2
宣言された環境 node 22 linux alpine x64 node 22 javascript npm

検証実行環境

環境 コントラクト ステージ 実行日
node 22 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · npm@1		 2026-08-14
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · npm@1		 2026-08-18

ケース

HOW
ゴール
Run a real vitest suite with no network, and know which of its matchers disagree with each other
パッケージ
シンボル
  • expect.toEqual
  • expect.toStrictEqual
  • expect.rejects
  • expect.toThrow
  • vi.useFakeTimers
  • vi.advanceTimersByTime
  • vi.advanceTimersByTimeAsync
  • startVitest
環境
node 22
作成日
2026-08-14T09:41:37Z

コントラクト

  1. run the suite with the network off on node:22-alpine, through vitest's node API
  2. assert five tests were collected and every one of them passed rather than skipped
  3. assert toEqual ignores an own property whose value is undefined, and toStrictEqual reports it
  4. assert toStrictEqual also rejects a class instance whose fields toEqual accepts
  5. assert advanceTimersByTime fires a setTimeout without waiting, and moves the faked Date by the same amount
  6. assert a cancelled timer never fires however far the clock is advanced
  7. assert advanceTimersByTime does not flush the microtask a timer's resolve queues, and advanceTimersByTimeAsync does
  8. assert await expect(...).rejects reports the rejection, while the bare call compares nothing and returns a thenable that is not a Promise
  9. assert toThrow sees no error from an async function, because the failure is a rejected promise and not a throw
  10. assert toBe is Object.is: NaN matches NaN, while -0 matches neither toBe(0) nor toEqual(0)
  11. run a second suite that forgets the await on two false .rejects assertions, and assert that run reports two tests and leaves process.exitCode at 1
  12. assert the forgotten await in a sync test function fails that test, carrying the real rejection message in the error
  13. assert the forgotten await in an async test function leaves the test reported as passed while the failure becomes the run's one unhandled error

ファイル

  • csx.json
  • package-lock.json
  • package.json
  • src/config.mjs
  • src/scheduler.mjs
  • test/contract.mjs
  • test/not-awaited-rejects.mjs
  • test/vitest-traps.test.mjs
  • vitest.config.mjs

ソースアーティファクトをダウンロード (tar.gz)

ソース

csx.json
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package.json
{
  "name": "csx-vitest-run-offline",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "devDependencies": {
    "vitest": "4.1.10"
  }
}
src/config.mjs
/**
 * The code under test. Two shapes chosen because they are the ones that make
 * vitest's matchers disagree with each other in real suites.
 *
 * normalize() sets `timeout` unconditionally, so the returned object OWNS a
 * property whose value is undefined. Every normalizer written with defaults
 * and optional fields does this. It is the difference between toEqual and
 * toStrictEqual, and it is invisible when you read the code.
 *
 * loadConfig() is async, so its failure is a rejected promise and never a
 * thrown exception, no matter how the failure is written inside the function.
 */

export class ConfigError extends Error {
  constructor(message, field) {
    super(message);
    this.name = "ConfigError";
    this.field = field;
  }
}

export function normalize(input) {
  return {
    name: input.name,
    retries: input.retries ?? 3,
    timeout: input.timeout,
  };
}

export async function loadConfig(input) {
  if (!input?.name) throw new ConfigError("name is required", "name");
  return normalize(input);
}
src/scheduler.mjs
/**
 * A one-shot timer and a delayed retry. Nothing here knows about vitest —
 * that is the point: fake timers replace the global setTimeout, so the code
 * being tested keeps calling the real API and never takes a clock argument.
 */

export function scheduleOnce(ms, fn) {
  const id = setTimeout(fn, ms);
  return () => clearTimeout(id);
}

/** Resolves after ms, reporting the clock it saw when it fired. */
export function retryAfter(ms) {
  return new Promise((resolve) => {
    setTimeout(() => resolve(Date.now()), ms);
  });
}
test/contract.mjs
import assert from "node:assert/strict";

import { startVitest, version as vitestVersion } from "vitest/node";

/**
 * Runs the suite in-process through vitest's node API instead of shelling out
 * to `npx vitest run`.
 *
 * Both work with no network, and that was measured rather than assumed:
 * `npm ci --ignore-scripts` still writes node_modules/.bin, so npx finds the
 * local binary and never reaches the registry, and a node-environment vitest
 * run makes no network call of its own. `npx vitest run` is the honest answer
 * to "does my suite run offline".
 *
 * This file exists for the two things an exit code cannot express.
 *
 * The first is a skipped test. With one of the five tests changed to it.skip,
 * `npx vitest run` prints "4 passed | 1 skipped" and exits 0 — a green run,
 * and a receipt claiming five behaviours were verified when four were. The
 * same file through this runner exits 1 on `actual: 'skipped', expected:
 * 'passed'`.
 *
 * The second is the negative run at the bottom. What vitest does with an
 * assertion whose await was forgotten cannot be asserted from inside a passing
 * test, so a suite that forgets one is run on purpose and its failure is what
 * gets asserted.
 *
 * The empty case needs no help: startVitest prints "No test files found,
 * exiting with code 1" and sets process.exitCode to 1 before it returns —
 * measured both with a filter that matches nothing and with an include that
 * matches nothing — so a renamed suite file already fails either way.
 */

const vitest = await startVitest("test", [], { watch: false });

// getTestModules/allTests is the reported-task API; it is populated after the
// run finishes, and startVitest has already closed the server by this point
// because watch is off.
const modules = vitest.state.getTestModules();
const tests = modules.flatMap((module) => [...module.children.allTests()]);
const states = tests.map((test) => [test.fullName, test.result().state]);

assert.equal(modules.length, 1, `expected one test module, got ${modules.length}`);
assert.equal(tests.length, 5, `expected five tests, got ${tests.length}`);

for (const [name, state] of states) {
  assert.equal(state, "passed", `${name}: ${state}`);
}

// vitest's own accounting and the module-level state, read independently of
// the per-test results above. A test that fails inside a hook, or a suite that
// errors while collecting, shows up here rather than in a test's result state.
assert.equal(vitest.state.getCountOfFailedTests(), 0);
assert.equal(modules[0].state(), "passed");

// A failing test sets process.exitCode from inside vitest, so leaving it dirty
// here would make node exit non-zero and this stage fail. Asserting it keeps
// the two signals from disagreeing silently.
assert.equal(process.exitCode ?? 0, 0);

// The negative run. A forgotten await is usually described as passing while
// asserting nothing; on vitest 4.1.10 it does not, and the two halves of
// test/not-awaited-rejects.mjs are red in two different ways.
console.log("\n### negative run: test/not-awaited-rejects.mjs is supposed to fail");

const negative = await startVitest("test", [], {
  watch: false,
  include: ["test/not-awaited-rejects.mjs"],
});
const negativeTests = negative.state
  .getTestModules()
  .flatMap((module) => [...module.children.allTests()]);
assert.equal(negativeTests.length, 2, `expected two tests, got ${negativeTests.length}`);

const syncTest = negativeTests.find((test) => test.fullName.startsWith("sync"));
const asyncTest = negativeTests.find((test) => test.fullName.startsWith("async"));
assert.ok(syncTest && asyncTest, "expected one sync and one async test");

// .rejects registers its promise on the running task. A sync test function
// returns before that promise settles, so it is still registered when the
// runner awaits the task's promises, and its rejection is reported as this
// test's failure. The real rejection message is inside the error, which is the
// proof that the comparison ran rather than being skipped.
assert.equal(syncTest.result().state, "failed", "sync test should have failed");
const [syncError] = syncTest.result().errors ?? [];
assert.match(syncError.message, /not the real message/);
assert.match(syncError.message, /name is required/);

// The async test function takes enough microtask turns that the assertion
// settles and unregisters itself first, so the runner finds nothing to await:
// the test is reported PASSED and the failure arrives as the run's unhandled
// error instead. Green test, red run — and any tooling that reads only test
// states calls this a pass.
assert.equal(asyncTest.result().state, "passed", "async test should have been reported passed");
const unhandled = negative.state.getUnhandledErrors();
assert.equal(unhandled.length, 1, `expected one unhandled error, got ${unhandled.length}`);
assert.match(String(unhandled[0].message), /not the real message either/);

// The failing suite set process.exitCode itself, which is the only reason the
// async half is visible from outside at all. Clearing it is what lets this
// stage report on the assertions above rather than on the suite that was
// supposed to fail.
assert.equal(process.exitCode, 1);
process.exitCode = 0;

console.log(`\ncontract ok: vitest ${vitestVersion}, ${tests.length} tests passed`);
for (const [name] of states) console.log(`  - ${name}`);
console.log("  - a forgotten await fails the test when the test function is sync");
console.log("  - a forgotten await in an async test function leaves the test green and the run red");
test/not-awaited-rejects.mjs
import { expect, it } from "vitest";

import { loadConfig } from "../src/config.mjs";

/**
 * This file is supposed to fail. Both assertions are false and neither is
 * awaited, which is the mistake everyone makes once.
 *
 * The runner starts it as its own vitest run and asserts how it fails, because
 * that is the only way to record the behaviour without shipping a red suite:
 * the passing run's include (test/*.test.mjs) does not match this name, so it
 * is never collected there.
 *
 * The two test functions differ only in the `async` keyword, and vitest 4
 * reports them differently. See test/contract.mjs for what was measured.
 */

it("sync test function, forgotten await", () => {
  expect(loadConfig({})).rejects.toThrow("not the real message");
});

it("async test function, forgotten await", async () => {
  expect(loadConfig({})).rejects.toThrow("not the real message either");
});
test/vitest-traps.test.mjs
import { expect, it, vi } from "vitest";

import { ConfigError, loadConfig, normalize } from "../src/config.mjs";
import { retryAfter, scheduleOnce } from "../src/scheduler.mjs";

/**
 * Five traps, one per test. Where two matchers disagree, both are asserted, so
 * the disagreement itself is what is on record rather than one side of it.
 */

it("toEqual ignores an own property whose value is undefined; toStrictEqual does not", () => {
  const config = normalize({ name: "worker" });

  // The property is really there. Nothing about it is optional or missing.
  expect(Object.hasOwn(config, "timeout")).toBe(true);
  expect(Object.keys(config)).toEqual(["name", "retries", "timeout"]);

  // toEqual treats undefined as absent, so this passes and reads like the
  // object has two keys.
  expect(config).toEqual({ name: "worker", retries: 3 });

  // toStrictEqual compares the key sets, so the same pair disagrees: a review
  // swaps toEqual for toStrictEqual, nothing about the code changes, and the
  // test fails.
  expect(config).not.toStrictEqual({ name: "worker", retries: 3 });
  expect(config).toStrictEqual({ name: "worker", retries: 3, timeout: undefined });

  // The other half of toStrictEqual: the prototype has to match too. A class
  // instance and a plain object with identical fields are toEqual and are not
  // toStrictEqual.
  class Config {
    constructor() {
      this.name = "worker";
    }
  }
  expect(new Config()).toEqual({ name: "worker" });
  expect(new Config()).not.toStrictEqual({ name: "worker" });
});

it("advanceTimersByTime runs a setTimeout without waiting for it, and moves Date", () => {
  vi.useFakeTimers();
  try {
    vi.setSystemTime(new Date("2026-01-01T00:00:00.000Z"));
    const start = Date.now();
    const fired = [];
    scheduleOnce(1000, () => fired.push(Date.now()));

    // One millisecond short is not close enough — the callback has not run.
    vi.advanceTimersByTime(999);
    expect(fired).toEqual([]);

    vi.advanceTimersByTime(1);
    expect(fired).toHaveLength(1);

    // useFakeTimers replaces Date as well as the timer functions, and the
    // clock moved by exactly what was advanced. Code that stamps Date.now()
    // inside a timer sees the timer's time, not the wall clock.
    expect(fired[0] - start).toBe(1000);
    expect(Date.now() - start).toBe(1000);

    // The cancel path, so that "it fired" is not passing for the wrong reason.
    const cancel = scheduleOnce(500, () => fired.push("cancelled"));
    cancel();
    vi.advanceTimersByTime(5000);
    expect(fired).toHaveLength(1);
  } finally {
    // Without this the fake clock leaks into every later test file in the
    // same worker.
    vi.useRealTimers();
  }
});

it("advanceTimersByTime is synchronous, so a promise resolved by a timer is not settled yet", async () => {
  vi.useFakeTimers();
  try {
    let settled = null;
    const pending = retryAfter(50).then((clock) => {
      settled = clock;
    });

    vi.advanceTimersByTime(50);

    // The timer callback ran and called resolve, but resolve only queues a
    // microtask and advanceTimersByTime never yields, so the .then body has
    // not executed. This is why "the awaited value is undefined" happens
    // under fake timers.
    expect(settled).toBeNull();

    await pending;
    expect(settled).toBe(Date.now());

    // The async variant advances and drains, which is what you want whenever
    // the code under test awaits anything inside a timer.
    let second = null;
    const chained = retryAfter(50).then((clock) => {
      second = clock;
    });
    await vi.advanceTimersByTimeAsync(50);
    expect(second).not.toBeNull();
    await chained;
  } finally {
    vi.useRealTimers();
  }
});

it("a rejection is compared inside the promise .rejects returns, not by the call", async () => {
  await expect(loadConfig({})).rejects.toBeInstanceOf(ConfigError);
  await expect(loadConfig({})).rejects.toThrow("name is required");
  await expect(loadConfig({})).rejects.toMatchObject({ field: "name" });

  // The trap, demonstrated instead of described. This assertion is false —
  // the rejection message is "name is required" — and making it throws
  // nothing: .rejects hands back a thenable, an object carrying then/catch/
  // finally that is not a Promise, and the comparison happens inside the
  // promise it wraps.
  const unawaited = expect(loadConfig({})).rejects.toThrow("not the real message");
  expect(typeof unawaited.then).toBe("function");
  expect(unawaited).not.toBeInstanceOf(Promise);

  // Awaiting that exact expression is the whole difference. Forgetting the
  // await is not the silent pass it is usually described as — vitest 4
  // registers the promise on the running test and auto-awaits it — but what
  // happens instead depends on whether the test function is async, so it is
  // measured in test/not-awaited-rejects.mjs rather than described here.
  let failure = null;
  try {
    await unawaited;
  } catch (error) {
    failure = error;
  }
  expect(failure).toBeInstanceOf(Error);
  expect(failure.message).toContain("not the real message");

  // And the synchronous matcher is not a weaker check, it is the wrong one:
  // an async function returns a rejected promise rather than throwing, so
  // toThrow watches a normal return and reports no error.
  const escaped = [];
  expect(() => escaped.push(loadConfig({}))).not.toThrow();
  await Promise.allSettled(escaped);
});

it("toBe compares with Object.is, so NaN matches NaN and -0 does not match 0", () => {
  // The reason people expect toBe(NaN) to fail.
  expect(NaN === NaN).toBe(false);

  // It passes anyway: toBe is Object.is, not ===, and Object.is(NaN, NaN)
  // is true. toEqual agrees, so on NaN the two matchers do not differ.
  expect(NaN).toBe(NaN);
  expect(NaN).toEqual(NaN);
  expect({ ratio: NaN }).toEqual({ ratio: NaN });
  expect([NaN]).toStrictEqual([NaN]);

  // Where Object.is really does bite is signed zero, which === accepts.
  expect(0 === -0).toBe(true);
  expect(-0).not.toBe(0);
  expect(-0).toBe(-0);
  expect(-0).not.toEqual(0);
});
vitest.config.mjs
import { defineConfig } from "vitest/config";

/**
 * `include` pins the passing run to one file. test/ also holds the runner
 * script and test/not-awaited-rejects.mjs, which is supposed to fail; the
 * runner starts that one as a separate run with its own include, and neither
 * name matches this glob.
 *
 * The pool is pinned to one worker because the sandbox container gets 512MB
 * and a 256 process limit. Left at the default, vitest sizes the pool from
 * the reported CPU count, which is the host's and not the container's.
 *
 * These are top-level test options on purpose. Vitest 4 removed
 * `poolOptions`, and the v3 spelling — poolOptions: { forks: { singleFork } } —
 * does not error. It prints one deprecation line and then runs with the
 * defaults it was meant to replace, so a copied v3 config looks like it is
 * being honoured.
 */
export default defineConfig({
  test: {
    include: ["test/*.test.mjs"],
    pool: "forks",
    maxWorkers: 1,
    fileParallelism: false,
  },
});

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