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test_runner: support test order randomization · nodejs/node@a21ae17 · GitHub

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test_runner: support test order randomization
PR-URL: #61747 Reviewed-By: Jacob Smith <jacob@frende.me> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com> Reviewed-By: Ethan Arrowood <ethan@arrowood.dev> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Aviv Keller <me@aviv.sh> Reviewed-By: Chemi Atlow <chemi@atlow.co.il> Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
1 parent e2ba824 commit a21ae17

28 files changed

Lines changed: 1557 additions & 21 deletions

‎doc/api/cli.md‎

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@@ -2780,6 +2780,38 @@ changes:
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Configures the test runner to only execute top level tests that have the `only`
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option set. This flag is not necessary when test isolation is disabled.
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### `--test-random-seed`
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<!-- YAML
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added: REPLACEME
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-->
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Set the seed used to randomize test execution order. This applies to both test
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file execution order and queued tests within each file. Providing this flag
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enables randomization implicitly, even without `--test-randomize`.
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The value must be an integer between `0` and `4294967295`.
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This flag cannot be used with `--watch` or `--test-rerun-failures`.
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### `--test-randomize`
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<!-- YAML
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added: REPLACEME
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-->
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Randomize test execution order. This applies to both test file execution order
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and queued tests within each file. This can help detect tests that rely on
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shared state or execution order.
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The seed used for randomization is printed in the test summary and can be
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reused with `--test-random-seed`.
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For detailed behavior and examples, see
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[randomizing tests execution order][].
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This flag cannot be used with `--watch` or `--test-rerun-failures`.
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### `--test-reporter`
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<!-- YAML
@@ -3698,6 +3730,8 @@ one is included in the list below.
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* `--test-isolation`
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* `--test-name-pattern`
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* `--test-only`
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* `--test-random-seed`
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* `--test-randomize`
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* `--test-reporter-destination`
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* `--test-reporter`
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* `--test-rerun-failures`
@@ -4282,6 +4316,7 @@ node --stack-trace-limit=12 -p -e "Error.stackTraceLimit" # prints 12
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[libuv threadpool documentation]: https://docs.libuv.org/en/latest/threadpool.html
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[module compile cache]: module.md#module-compile-cache
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[preloading asynchronous module customization hooks]: module.md#registration-of-asynchronous-customization-hooks
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[randomizing tests execution order]: test.md#randomizing-tests-execution-order
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[remote code execution]: https://www.owasp.org/index.php/Code_Injection
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[running tests from the command line]: test.md#running-tests-from-the-command-line
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[scavenge garbage collector]: https://v8.dev/blog/orinoco-parallel-scavenger

‎doc/api/test.md‎

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@@ -627,6 +627,94 @@ prevent shell expansion, which can reduce portability across systems.
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node --test "**/*.test.js" "**/*.spec.js"
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```
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### Randomizing tests execution order
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<!-- YAML
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added: REPLACEME
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-->
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> Stability: 1.0 - Early development
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The test runner can randomize execution order to help detect
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order-dependent tests. When enabled, the runner randomizes both discovered
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test files and queued tests within each file. Use `--test-randomize` to
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enable this mode.
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```bash
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node --test --test-randomize
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```
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When randomization is enabled, the test runner prints the seed used for the run
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as a diagnostic message:
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```text
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Randomized test order seed: 12345
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```
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Use `--test-random-seed=<number>` to replay the same randomized order
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deterministically. Supplying `--test-random-seed` also enables randomization,
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so `--test-randomize` is optional when a seed is provided:
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```bash
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node --test --test-random-seed=12345
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```
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In most test files, randomization works automatically. One important exception
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is when subtests are awaited one by one. In that pattern, each subtest starts
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only after the previous one finishes, so the runner keeps declaration order
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instead of randomizing it.
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Example: this runs sequentially and is **not** randomized.
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```mjs
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import test from 'node:test';
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test('math', async (t) => {
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for (const name of ['adds', 'subtracts', 'multiplies']) {
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// Sequentially awaiting each subtest preserves declaration order.
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await t.test(name, async () => {});
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}
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});
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```
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```cjs
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const test = require('node:test');
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test('math', async (t) => {
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for (const name of ['adds', 'subtracts', 'multiplies']) {
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// Sequentially awaiting each subtest preserves declaration order.
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await t.test(name, async () => {});
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}
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});
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```
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Using suite-style APIs such as `describe()`/`it()` or `suite()`/`test()`
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still allows randomization, because sibling tests are enqueued together.
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Example: this remains eligible for randomization.
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```mjs
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import { describe, it } from 'node:test';
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describe('math', () => {
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it('adds', () => {});
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it('subtracts', () => {});
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it('multiplies', () => {});
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});
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```
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```cjs
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const { describe, it } = require('node:test');
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describe('math', () => {
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it('adds', () => {});
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it('subtracts', () => {});
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it('multiplies', () => {});
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});
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```
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`--test-randomize` and `--test-random-seed` are not supported with `--watch` mode.
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Matching files are executed as test files.
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More information on the test file execution can be found
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in the [test runner execution model][] section.
@@ -667,6 +755,10 @@ test runner functionality:
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* `--test-reporter` - Reporting is managed by the parent process
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* `--test-reporter-destination` - Output destinations are controlled by the parent
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* `--experimental-config-file` - Config file paths are managed by the parent
758+
* `--test-randomize` - Randomization is managed by the parent process and
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propagated to child processes
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* `--test-random-seed` - Randomization seed is managed by the parent process and
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propagated to child processes
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All other Node.js options from command line arguments, environment variables,
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and configuration files are inherited by the child processes.
@@ -1575,6 +1667,14 @@ changes:
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that specifies the index of the shard to run. This option is _required_.
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* `total` {number} is a positive integer that specifies the total number
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of shards to split the test files to. This option is _required_.
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* `randomize` {boolean} Randomize execution order for test files and queued tests.
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This option is not supported with `watch: true`.
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**Default:** `false`.
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* `randomSeed` {number} Seed used when randomizing execution order. If this
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option is set, runs can replay the same randomized order deterministically,
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and setting this option also enables randomization. The value must be an
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integer between `0` and `4294967295`.
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**Default:** `undefined`.
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* `rerunFailuresFilePath` {string} A file path where the test runner will
15791679
store the state of the tests to allow rerunning only the failed tests on a next run.
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see \[Rerunning failed tests]\[] for more information.

‎doc/node-config-schema.json‎

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@@ -524,6 +524,14 @@
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"type": "boolean",
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"description": "run tests with 'only' option set"
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},
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"test-random-seed": {
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"type": "number",
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"description": "seed used to randomize test execution order"
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},
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"test-randomize": {
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"type": "boolean",
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"description": "run tests in a random order"
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},
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"test-reporter": {
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"oneOf": [
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{
@@ -906,6 +914,14 @@
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"type": "boolean",
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"description": "run tests with 'only' option set"
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},
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"test-random-seed": {
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"type": "number",
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"description": "seed used to randomize test execution order"
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},
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"test-randomize": {
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"type": "boolean",
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"description": "run tests in a random order"
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},
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"test-reporter": {
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"oneOf": [
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{

‎doc/node.1‎

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@@ -1363,6 +1363,22 @@ tests must satisfy \fBboth\fR requirements in order to be executed.
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Configures the test runner to only execute top level tests that have the \fBonly\fR
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option set. This flag is not necessary when test isolation is disabled.
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.
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.It Fl -test-random-seed
1367+
Set the seed used to randomize test execution order.
1368+
This applies to both test file execution order and queued tests within each file.
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Providing this flag enables randomization implicitly, even without
1370+
\fB--test-randomize\fR.
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The value must be an integer between 0 and 4294967295.
1372+
This flag cannot be used with \fB--watch\fR or \fB--test-rerun-failures\fR.
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.
1374+
.It Fl -test-randomize
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Randomize test execution order.
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This applies to both test file execution order and queued tests within each file.
1377+
This can help detect tests that rely on shared state or execution order.
1378+
The seed used for randomization is printed in the test summary and can be
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reused with \fB--test-random-seed\fR.
1380+
This flag cannot be used with \fB--watch\fR or \fB--test-rerun-failures\fR.
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.
13661382
.It Fl -test-reporter
13671383
A test reporter to use when running tests. See the documentation on
13681384
test reporters for more details.
@@ -2040,6 +2056,10 @@ one is included in the list below.
20402056
.It
20412057
\fB--test-reporter-destination\fR
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.It
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\fB--test-randomize\fR
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.It
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\fB--test-random-seed\fR
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.It
20432063
\fB--test-reporter\fR
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.It
20452065
\fB--test-rerun-failures\fR

‎lib/internal/test_runner/runner.js‎

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Original file line numberDiff line numberDiff line change
@@ -59,6 +59,7 @@ const {
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validateObject,
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validateOneOf,
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validateInteger,
62+
validateUint32,
6263
validateString,
6364
validateStringArray,
6465
} = require('internal/validators');
@@ -84,6 +85,7 @@ const {
8485
const { FastBuffer } = require('internal/buffer');
8586

8687
const {
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createRandomSeed,
8789
convertStringToRegExp,
8890
countCompletedTest,
8991
kDefaultPattern,
@@ -105,12 +107,14 @@ const kIsolatedProcessName = Symbol('kIsolatedProcessName');
105107
const kFilterArgs = [
106108
'--test',
107109
'--experimental-test-coverage',
110+
'--test-randomize',
108111
'--watch',
109112
'--experimental-default-config-file',
110113
];
111114
const kFilterArgValues = [
112115
'--test-reporter',
113116
'--test-reporter-destination',
117+
'--test-random-seed',
114118
'--experimental-config-file',
115119
];
116120
const kDiagnosticsFilterArgs = ['tests', 'suites', 'pass', 'fail', 'cancelled', 'skipped', 'todo', 'duration_ms'];
@@ -168,6 +172,8 @@ function getRunArgs(path, { forceExit,
168172
argv: suppliedArgs,
169173
execArgv,
170174
rerunFailuresFilePath,
175+
randomize,
176+
randomSeed,
171177
root: { timeout },
172178
cwd }) {
173179
const processNodeOptions = getOptionsAsFlagsFromBinding();
@@ -209,6 +215,12 @@ function getRunArgs(path, { forceExit,
209215
if (rerunFailuresFilePath) {
210216
ArrayPrototypePush(runArgs, `--test-rerun-failures=${rerunFailuresFilePath}`);
211217
}
218+
if (randomize) {
219+
ArrayPrototypePush(runArgs, '--test-randomize');
220+
}
221+
if (randomSeed != null) {
222+
ArrayPrototypePush(runArgs, `--test-random-seed=${randomSeed}`);
223+
}
212224

213225
ArrayPrototypePushApply(runArgs, execArgv);
214226

@@ -646,6 +658,8 @@ function run(options = kEmptyObject) {
646658
lineCoverage = 0,
647659
branchCoverage = 0,
648660
functionCoverage = 0,
661+
randomize: suppliedRandomize,
662+
randomSeed: suppliedRandomSeed,
649663
execArgv = [],
650664
argv = [],
651665
cwd = process.cwd(),
@@ -674,6 +688,56 @@ function run(options = kEmptyObject) {
674688
if (globPatterns != null) {
675689
validateArray(globPatterns, 'options.globPatterns');
676690
}
691+
if (suppliedRandomize != null) {
692+
validateBoolean(suppliedRandomize, 'options.randomize');
693+
}
694+
if (suppliedRandomSeed != null) {
695+
validateUint32(suppliedRandomSeed, 'options.randomSeed');
696+
}
697+
let randomize = suppliedRandomize;
698+
let randomSeed = suppliedRandomSeed;
699+
700+
if (randomSeed != null) {
701+
randomize = true;
702+
}
703+
if (watch) {
704+
if (randomSeed != null) {
705+
throw new ERR_INVALID_ARG_VALUE(
706+
'options.randomSeed',
707+
randomSeed,
708+
'is not supported with watch mode',
709+
);
710+
}
711+
if (randomize) {
712+
throw new ERR_INVALID_ARG_VALUE(
713+
'options.randomize',
714+
randomize,
715+
'is not supported with watch mode',
716+
);
717+
}
718+
}
719+
if (rerunFailuresFilePath) {
720+
validatePath(rerunFailuresFilePath, 'options.rerunFailuresFilePath');
721+
// TODO(pmarchini): Support rerun-failures with randomization by
722+
// persisting the randomization seed in the rerun state file.
723+
if (randomSeed != null) {
724+
throw new ERR_INVALID_ARG_VALUE(
725+
'options.randomSeed',
726+
randomSeed,
727+
'is not supported with rerun failures mode',
728+
);
729+
}
730+
if (randomize) {
731+
throw new ERR_INVALID_ARG_VALUE(
732+
'options.randomize',
733+
randomize,
734+
'is not supported with rerun failures mode',
735+
);
736+
}
737+
}
738+
if (randomize) {
739+
randomSeed ??= createRandomSeed();
740+
}
677741

678742
validateString(cwd, 'options.cwd');
679743

@@ -683,10 +747,6 @@ function run(options = kEmptyObject) {
683747
);
684748
}
685749

686-
if (rerunFailuresFilePath) {
687-
validatePath(rerunFailuresFilePath, 'options.rerunFailuresFilePath');
688-
}
689-
690750
if (shard != null) {
691751
validateObject(shard, 'options.shard');
692752
// Avoid re-evaluating the shard object in case it's a getter
@@ -783,11 +843,18 @@ function run(options = kEmptyObject) {
783843
functionCoverage: functionCoverage,
784844
cwd,
785845
globalSetupPath,
846+
randomize,
847+
randomSeed,
786848
};
849+
787850
const root = createTestTree(rootTestOptions, globalOptions);
788851
let testFiles = files ?? createTestFileList(globPatterns, cwd);
789852
const { isTestRunner } = globalOptions;
790853

854+
if (randomize) {
855+
root.diagnostic(`Randomized test order seed: ${randomSeed}`);
856+
}
857+
791858
if (shard) {
792859
testFiles = ArrayPrototypeFilter(testFiles, (_, index) => index % shard.total === shard.index - 1);
793860
}
@@ -833,6 +900,8 @@ function run(options = kEmptyObject) {
833900
rerunFailuresFilePath,
834901
env,
835902
workerIdPool: isolation === 'process' ? workerIdPool : null,
903+
randomize,
904+
randomSeed,
836905
};
837906

838907
if (isolation === 'process') {

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