test_runner: mark snapshot testing as stable

This commit marks the test runner's snapshot testing API as
stable.

doc/api/cli.md

@@ -1129,16 +1129,6 @@ added:
 
 Enable module mocking in the test runner.
 
-### `--experimental-test-snapshots`
-
-<!-- YAML
-added: v22.3.0
--->
-
-> Stability: 1.0 - Early development
-
-Enable [snapshot testing][] in the test runner.
-
 ### `--experimental-vm-modules`
 
 <!-- YAML
@@ -2468,13 +2458,13 @@ subtests inherit this value from their parent. The default value is `Infinity`.
 
 <!-- YAML
 added: v22.3.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/55896
+    description: Snapsnot testing is no longer experimental.
 -->
 
-> Stability: 1.0 - Early development
-
 Regenerates the snapshot files used by the test runner for [snapshot testing][].
-Node.js must be started with the `--experimental-test-snapshots` flag in order
-to use this functionality.
 
 ### `--throw-deprecation`
 

doc/api/test.md

@@ -937,8 +937,7 @@ compared against a set of known good values. The known good values are known as
 snapshots, and are stored in a snapshot file. Snapshot files are managed by the
 test runner, but are designed to be human readable to aid in debugging. Best
 practice is for snapshot files to be checked into source control along with your
-test files. In order to enable snapshot testing, Node.js must be started with
-the [`--experimental-test-snapshots`][] command-line flag.
+test files.
 
 Snapshot files are generated by starting Node.js with the
 [`--test-update-snapshots`][] command-line flag. A separate snapshot file is
@@ -3591,7 +3590,6 @@ Can be used to abort test subtasks when the test has been aborted.
 [`--experimental-strip-types`]: cli.md#--experimental-strip-types
 [`--experimental-test-coverage`]: cli.md#--experimental-test-coverage
 [`--experimental-test-module-mocks`]: cli.md#--experimental-test-module-mocks
-[`--experimental-test-snapshots`]: cli.md#--experimental-test-snapshots
 [`--import`]: cli.md#--importmodule
 [`--test-concurrency`]: cli.md#--test-concurrency
 [`--test-coverage-include`]: cli.md#--test-coverage-include

doc/node.1

@@ -194,9 +194,6 @@ Configures the type of test isolation used in the test runner.
 .It Fl -experimental-test-module-mocks
 Enable module mocking in the test runner.
 .
-.It Fl -experimental-test-snapshots
-Enable snapshot testing in the test runner.
-.
 .It Fl -experimental-strip-types
 Enable experimental type-stripping for TypeScript files.
 .

lib/internal/test_runner/test.js

@@ -104,6 +104,7 @@ function lazyAssertObject(harness) {
   if (assertObj === undefined) {
     assertObj = new SafeMap();
     const assert = require('assert');
+    const { SnapshotManager } = require('internal/test_runner/snapshot');
     const methodsToCopy = [
       'deepEqual',
       'deepStrictEqual',
@@ -126,12 +127,8 @@ function lazyAssertObject(harness) {
       assertObj.set(methodsToCopy[i], assert[methodsToCopy[i]]);
     }
 
-    const { getOptionValue } = require('internal/options');
-    if (getOptionValue('--experimental-test-snapshots')) {
-      const { SnapshotManager } = require('internal/test_runner/snapshot');
-      harness.snapshotManager = new SnapshotManager(harness.config.updateSnapshots);
-      assertObj.set('snapshot', harness.snapshotManager.createAssert());
-    }
+    harness.snapshotManager = new SnapshotManager(harness.config.updateSnapshots);
+    assertObj.set('snapshot', harness.snapshotManager.createAssert());
   }
   return assertObj;
 }

lib/test.js

@@ -7,7 +7,6 @@ const {
 
 const { test, suite, before, after, beforeEach, afterEach } = require('internal/test_runner/harness');
 const { run } = require('internal/test_runner/runner');
-const { getOptionValue } = require('internal/options');
 
 module.exports = test;
 ObjectAssign(module.exports, {
@@ -39,28 +38,26 @@ ObjectDefineProperty(module.exports, 'mock', {
   },
 });
 
-if (getOptionValue('--experimental-test-snapshots')) {
-  let lazySnapshot;
+let lazySnapshot;
 
-  ObjectDefineProperty(module.exports, 'snapshot', {
-    __proto__: null,
-    configurable: true,
-    enumerable: true,
-    get() {
-      if (lazySnapshot === undefined) {
-        const {
-          setDefaultSnapshotSerializers,
-          setResolveSnapshotPath,
-        } = require('internal/test_runner/snapshot');
-
-        lazySnapshot = {
-          __proto__: null,
-          setDefaultSnapshotSerializers,
-          setResolveSnapshotPath,
-        };
-      }
+ObjectDefineProperty(module.exports, 'snapshot', {
+  __proto__: null,
+  configurable: true,
+  enumerable: true,
+  get() {
+    if (lazySnapshot === undefined) {
+      const {
+        setDefaultSnapshotSerializers,
+        setResolveSnapshotPath,
+      } = require('internal/test_runner/snapshot');
+
+      lazySnapshot = {
+        __proto__: null,
+        setDefaultSnapshotSerializers,
+        setResolveSnapshotPath,
+      };
+    }
 
-      return lazySnapshot;
-    },
-  });
-}
+    return lazySnapshot;
+  },
+});

src/node_options.cc

@@ -691,9 +691,7 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
   AddOption("--experimental-test-module-mocks",
             "enable module mocking in the test runner",
             &EnvironmentOptions::test_runner_module_mocks);
-  AddOption("--experimental-test-snapshots",
-            "enable snapshot testing in the test runner",
-            &EnvironmentOptions::test_runner_snapshots);
+  AddOption("--experimental-test-snapshots", "", NoOp{});
   AddOption("--test-name-pattern",
             "run tests whose name matches this regular expression",
             &EnvironmentOptions::test_name_pattern,

src/node_options.h

@@ -189,7 +189,6 @@ class EnvironmentOptions : public Options {
   uint64_t test_coverage_functions = 0;
   uint64_t test_coverage_lines = 0;
   bool test_runner_module_mocks = false;
-  bool test_runner_snapshots = false;
   bool test_runner_update_snapshots = false;
   std::vector<std::string> test_name_pattern;
   std::vector<std::string> test_reporter;

test/parallel/test-runner-assert.js

@@ -3,13 +3,14 @@ require('../common');
 const assert = require('node:assert');
 const test = require('node:test');
 
-const uncopiedKeys = [
-  'AssertionError',
-  'CallTracker',
-  'strict',
-];
-test('only methods from node:assert are on t.assert', (t) => {
-  const expectedKeys = Object.keys(assert).filter((key) => !uncopiedKeys.includes(key)).sort();
+test('expected methods are on t.assert', (t) => {
+  const uncopiedKeys = [
+    'AssertionError',
+    'CallTracker',
+    'strict',
+  ];
+  const assertKeys = Object.keys(assert).filter((key) => !uncopiedKeys.includes(key));
+  const expectedKeys = ['snapshot'].concat(assertKeys).sort();
   assert.deepStrictEqual(Object.keys(t.assert).sort(), expectedKeys);
 });
 

test/parallel/test-runner-snapshot-tests.js

@@ -1,4 +1,4 @@
-// Flags: --expose-internals --experimental-test-snapshots
+// Flags: --expose-internals
 /* eslint-disable no-template-curly-in-string */
 'use strict';
 const common = require('../common');
@@ -299,7 +299,7 @@ test('t.assert.snapshot()', async (t) => {
   await t.test('fails prior to snapshot generation', async (t) => {
     const child = await common.spawnPromisified(
       process.execPath,
-      ['--experimental-test-snapshots', fixture],
+      [fixture],
       { cwd: tmpdir.path },
     );
 
@@ -314,7 +314,7 @@ test('t.assert.snapshot()', async (t) => {
   await t.test('passes when regenerating snapshots', async (t) => {
     const child = await common.spawnPromisified(
       process.execPath,
-      ['--test-update-snapshots', '--experimental-test-snapshots', fixture],
+      ['--test-update-snapshots', fixture],
       { cwd: tmpdir.path },
     );
 
@@ -328,7 +328,7 @@ test('t.assert.snapshot()', async (t) => {
   await t.test('passes when snapshots exist', async (t) => {
     const child = await common.spawnPromisified(
       process.execPath,
-      ['--experimental-test-snapshots', fixture],
+      [fixture],
       { cwd: tmpdir.path },
     );
 
@@ -350,7 +350,6 @@ test('snapshots from multiple files (isolation=none)', async (t) => {
     const args = [
       '--test',
       '--experimental-test-isolation=none',
-      '--experimental-test-snapshots',
       fixture,
       fixture2,
     ];
@@ -372,7 +371,6 @@ test('snapshots from multiple files (isolation=none)', async (t) => {
     const args = [
       '--test',
       '--experimental-test-isolation=none',
-      '--experimental-test-snapshots',
       '--test-update-snapshots',
       fixture,
       fixture2,
@@ -394,7 +392,6 @@ test('snapshots from multiple files (isolation=none)', async (t) => {
     const args = [
       '--test',
       '--experimental-test-isolation=none',
-      '--experimental-test-snapshots',
       fixture,
       fixture2,
     ];