test_runner: fixed `test` shorthands return type

`test.todo`, `test.only` and `test.skip` are expected to return the
same as `test`. This commit corrects the inconsistent behavior of
these shorthands.

Fixes: https://github.com/nodejs/node/issues/48557
PR-URL: https://github.com/nodejs/node/pull/48555
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

lib/internal/test_runner/harness.js

@@ -216,9 +216,7 @@ function runInParentContext(Factory) {
 
   const test = (name, options, fn) => run(name, options, fn);
   ArrayPrototypeForEach(['skip', 'todo', 'only'], (keyword) => {
-    test[keyword] = (name, options, fn) => {
-      run(name, options, fn, { [keyword]: true });
-    };
+    test[keyword] = (name, options, fn) => run(name, options, fn, { [keyword]: true });
   });
   return test;
 }

test/parallel/test-runner-typechecking.js

@@ -0,0 +1,36 @@
+'use strict';
+require('../common');
+
+// Return type of shorthands should be consistent
+// with the return type of test
+
+const assert = require('assert');
+const { test, describe, it } = require('node:test');
+const { isPromise } = require('util/types');
+
+const testOnly = test('only test', { only: true });
+const testTodo = test('todo test', { todo: true });
+const testSkip = test('skip test', { skip: true });
+const testOnlyShorthand = test.only('only test shorthand');
+const testTodoShorthand = test.todo('todo test shorthand');
+const testSkipShorthand = test.skip('skip test shorthand');
+
+describe('\'node:test\' and its shorthands should return the same', () => {
+  it('should return a Promise', () => {
+    assert(isPromise(testOnly));
+    assert(isPromise(testTodo));
+    assert(isPromise(testSkip));
+    assert(isPromise(testOnlyShorthand));
+    assert(isPromise(testTodoShorthand));
+    assert(isPromise(testSkipShorthand));
+  });
+
+  it('should resolve undefined', async () => {
+    assert.strictEqual(await testOnly, undefined);
+    assert.strictEqual(await testTodo, undefined);
+    assert.strictEqual(await testSkip, undefined);
+    assert.strictEqual(await testOnlyShorthand, undefined);
+    assert.strictEqual(await testTodoShorthand, undefined);
+    assert.strictEqual(await testSkipShorthand, undefined);
+  });
+});