test_runner: remove promises returned by t.test()

This commit updates the TestContext.prototype.test() API to no
longer return a Promise.

Fixes: #51292

doc/api/test.md

@@ -105,11 +105,11 @@ top level test with two subtests.
 
 ```js
 test('top level test', async (t) => {
-  await t.test('subtest 1', (t) => {
+  t.test('subtest 1', (t) => {
     assert.strictEqual(1, 1);
   });
 
-  await t.test('subtest 2', (t) => {
+  t.test('subtest 2', (t) => {
     assert.strictEqual(2, 2);
   });
 });
@@ -118,12 +118,7 @@ test('top level test', async (t) => {
 > **Note:** `beforeEach` and `afterEach` hooks are triggered
 > between each subtest execution.
 
-In this example, `await` is used to ensure that both subtests have completed.
-This is necessary because tests do not wait for their subtests to
-complete, unlike tests created within suites.
-Any subtests that are still outstanding when their parent finishes
-are cancelled and treated as failures. Any subtest failures cause the parent
-test to fail.
+Any subtest failures cause the parent test to fail.
 
 ## Skipping tests
 
@@ -241,20 +236,20 @@ that are not executed are omitted from the test runner output.
 // The suite's 'only' option is set, so these tests are run.
 test('this test is run', { only: true }, async (t) => {
   // Within this test, all subtests are run by default.
-  await t.test('running subtest');
+  t.test('running subtest');
 
   // The test context can be updated to run subtests with the 'only' option.
   t.runOnly(true);
-  await t.test('this subtest is now skipped');
-  await t.test('this subtest is run', { only: true });
+  t.test('this subtest is now skipped');
+  t.test('this subtest is run', { only: true });
 
   // Switch the context back to execute all tests.
   t.runOnly(false);
-  await t.test('this subtest is now run');
+  t.test('this subtest is now run');
 
   // Explicitly do not run these tests.
-  await t.test('skipped subtest 3', { only: false });
-  await t.test('skipped subtest 4', { skip: true });
+  t.test('skipped subtest 3', { only: false });
+  t.test('skipped subtest 4', { skip: true });
 });
 
 // The 'only' option is not set, so this test is skipped.
@@ -309,13 +304,13 @@ multiple times (e.g. `--test-name-pattern="test 1"`,
 
 ```js
 test('test 1', async (t) => {
-  await t.test('test 2');
-  await t.test('test 3');
+  t.test('test 2');
+  t.test('test 3');
 });
 
 test('Test 4', async (t) => {
-  await t.test('Test 5');
-  await t.test('test 6');
+  t.test('Test 5');
+  t.test('test 6');
 });
 ```
 
@@ -3175,12 +3170,9 @@ before each subtest of the current test.
 ```js
 test('top level test', async (t) => {
   t.beforeEach((t) => t.diagnostic(`about to run ${t.name}`));
-  await t.test(
-    'This is a subtest',
-    (t) => {
-      assert.ok('some relevant assertion here');
-    },
-  );
+  t.test('This is a subtest', (t) => {
+    assert.ok('some relevant assertion here');
+  });
 });
 ```
 
@@ -3238,12 +3230,9 @@ after each subtest of the current test.
 ```js
 test('top level test', async (t) => {
   t.afterEach((t) => t.diagnostic(`finished running ${t.name}`));
-  await t.test(
-    'This is a subtest',
-    (t) => {
-      assert.ok('some relevant assertion here');
-    },
-  );
+  t.test('This is a subtest', (t) => {
+    assert.ok('some relevant assertion here');
+  });
 });
 ```
 
@@ -3458,10 +3447,8 @@ no-op.
 test('top level test', (t) => {
   // The test context can be set to run subtests with the 'only' option.
   t.runOnly(true);
-  return Promise.all([
-    t.test('this subtest is now skipped'),
-    t.test('this subtest is run', { only: true }),
-  ]);
+  t.test('this subtest is now skipped');
+  t.test('this subtest is run', { only: true });
 });
 ```
 
@@ -3533,6 +3520,10 @@ added:
   - v18.0.0
   - v16.17.0
 changes:
+  - version:
+    - REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/56664
+    description: This function no longer returns a `Promise`.
   - version:
     - v18.8.0
     - v16.18.0
@@ -3577,14 +3568,13 @@ changes:
   to this function is a [`TestContext`][] object. If the test uses callbacks,
   the callback function is passed as the second argument. **Default:** A no-op
   function.
-* Returns: {Promise} Fulfilled with `undefined` once the test completes.
 
 This function is used to create subtests under the current test. This function
 behaves in the same fashion as the top level [`test()`][] function.
 
 ```js
 test('top level test', async (t) => {
-  await t.test(
+  t.test(
     'This is a subtest',
     { only: false, skip: false, concurrency: 1, todo: false, plan: 1 },
     (t) => {

lib/internal/test_runner/test.js

@@ -304,7 +304,7 @@ class TestContext {
       Test, name, options, fn, overrides,
     );
 
-    return subtest.start();
+    subtest.start();
   }
 
   before(fn, options) {

test/fixtures/test-runner/output/dot_reporter.snapshot

@@ -154,8 +154,6 @@ Failed tests:
       *
       *
       *
-      *
-      *
 ✖ subtest sync throw fails (*ms)
   '2 subtests failed'
 ✖ timed out async test (*ms)

test/fixtures/test-runner/output/hooks.snapshot

@@ -576,7 +576,6 @@ not ok 16 - t.after throws - no subtests
         *
         *
         *
-        *
       ...
     1..2
 not ok 17 - t.beforeEach throws
@@ -607,8 +606,6 @@ not ok 17 - t.beforeEach throws
         *
         *
         *
-        *
-        *
       ...
     # Subtest: 2
     not ok 2 - 2
@@ -629,7 +626,6 @@ not ok 17 - t.beforeEach throws
         *
         *
         *
-        *
       ...
     1..2
 not ok 18 - t.afterEach throws
@@ -757,7 +753,6 @@ not ok 21 - afterEach context when test fails
         *
         *
         *
-        *
       ...
     1..2
 not ok 22 - afterEach throws and test fails

test/fixtures/test-runner/output/hooks_spec_reporter.snapshot

@@ -282,7 +282,6 @@
         *
         *
         *
-        *
 
  t.beforeEach throws (*ms)
  t.afterEach throws
@@ -296,8 +295,6 @@
         *
         *
         *
-        *
-        *
 
    2 (*ms)
     Error: afterEach
@@ -310,7 +307,6 @@
         *
         *
         *
-        *
 
  t.afterEach throws (*ms)
  afterEach when test fails
@@ -364,7 +360,6 @@
         *
         *
         *
-        *
 
  afterEach throws and test fails (*ms)
  t.after() is called if test body throws (*ms)
@@ -674,7 +669,6 @@
       *
       *
       *
-      *
 
 *
  1 (*ms)
@@ -687,8 +681,6 @@
       *
       *
       *
-      *
-      *
 
 *
  2 (*ms)
@@ -702,7 +694,6 @@
       *
       *
       *
-      *
 
 *
  1 (*ms)
@@ -750,7 +741,6 @@
       *
       *
       *
-      *
 
 *
  t.after() is called if test body throws (*ms)

test/fixtures/test-runner/output/junit_reporter.snapshot

@@ -351,8 +351,7 @@ Error [ERR_TEST_FAILURE]: thrown from subtest sync throw fails at first
 		</testcase>
 		<testcase name="sync throw fails at second" time="*" classname="test" failure="thrown from subtest sync throw fails at second">
 			<failure type="testCodeFailure" message="thrown from subtest sync throw fails at second">
-Error [ERR_TEST_FAILURE]: thrown from subtest sync throw fails at second
-    * {
+[Error [ERR_TEST_FAILURE]: thrown from subtest sync throw fails at second] {
   code: 'ERR_TEST_FAILURE',
   failureType: 'testCodeFailure',
   cause: Error: thrown from subtest sync throw fails at second
@@ -362,8 +361,6 @@ Error [ERR_TEST_FAILURE]: thrown from subtest sync throw fails at second
       *
       *
       *
-      *
-      *
 }
 			</failure>
 		</testcase>

test/fixtures/test-runner/output/output.snapshot

@@ -598,8 +598,6 @@ not ok 51 - custom inspect symbol that throws fail
         *
         *
         *
-        *
-        *
       ...
     1..2
 not ok 52 - subtest sync throw fails

test/fixtures/test-runner/output/output_cli.snapshot

@@ -606,8 +606,6 @@ not ok 51 - custom inspect symbol that throws fail
         *
         *
         *
-        *
-        *
       ...
     1..2
 not ok 52 - subtest sync throw fails

test/fixtures/test-runner/output/spec_reporter.snapshot

@@ -216,8 +216,6 @@
         *
         *
         *
-        *
-        *
 
  subtest sync throw fails (*ms)
  timed out async test (*ms)
@@ -495,8 +493,6 @@
       *
       *
       *
-      *
-      *
 
 *
  timed out async test (*ms)

test/fixtures/test-runner/output/spec_reporter_cli.snapshot

@@ -219,8 +219,6 @@
         *
         *
         *
-        *
-        *
 
  subtest sync throw fails (*ms)
  timed out async test (*ms)
@@ -498,8 +496,6 @@
       *
       *
       *
-      *
-      *
 
 *
  timed out async test (*ms)

test/parallel/test-runner-module-mocking.js

@@ -448,13 +448,15 @@ test('mocks are automatically restored', async (t) => {
     assert.strictEqual(mocked.fn(), 43);
   });
 
-  const cjsMock = require(cjsFixture);
-  const esmMock = await import(esmFixture);
+  t.test('checks original behavior', async () => {
+    const cjsMock = require(cjsFixture);
+    const esmMock = await import(esmFixture);
 
-  assert.strictEqual(cjsMock.string, 'original cjs string');
-  assert.strictEqual(cjsMock.fn, undefined);
-  assert.strictEqual(esmMock.string, 'original esm string');
-  assert.strictEqual(esmMock.fn, undefined);
+    assert.strictEqual(cjsMock.string, 'original cjs string');
+    assert.strictEqual(cjsMock.fn, undefined);
+    assert.strictEqual(esmMock.string, 'original esm string');
+    assert.strictEqual(esmMock.fn, undefined);
+  });
 });
 
 test('mocks can be restored independently', async (t) => {