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Commit a21ae17

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pmarchiniaduh95
pmarchini
authored and
aduh95
committed
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>
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+1,557-21Lines changed: 1557 additions & 21 deletions
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‎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
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‎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) => {
684+
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 () => {});
687+
}
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});
689+
```
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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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});
704+
```
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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:
667755
* `--test-reporter` - Reporting is managed by the parent process
668756
* `--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
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* `--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.
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‎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"
920+
},
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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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{
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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.
13631363
Configures the test runner to only execute top level tests that have the \fBonly\fR
13641364
option set. This flag is not necessary when test isolation is disabled.
13651365
.
1366+
.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.
1369+
Providing this flag enables randomization implicitly, even without
1370+
\fB--test-randomize\fR.
1371+
The value must be an integer between 0 and 4294967295.
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This flag cannot be used with \fB--watch\fR or \fB--test-rerun-failures\fR.
1373+
.
1374+
.It Fl -test-randomize
1375+
Randomize test execution order.
1376+
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
1379+
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
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\fB--test-reporter-destination\fR
20422058
.It
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\fB--test-randomize\fR
2060+
.It
2061+
\fB--test-random-seed\fR
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.It
20432063
\fB--test-reporter\fR
20442064
.It
20452065
\fB--test-rerun-failures\fR
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‎lib/internal/test_runner/runner.js‎

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+73-4Lines changed: 73 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -59,6 +59,7 @@ const {
5959
validateObject,
6060
validateOneOf,
6161
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 {
88+
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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