fix: run GC before collecting open handles (#11278)

Author: SimenB

CHANGELOG.md

@@ -70,6 +70,7 @@
 - `[jest-core]` Don't report PerformanceObserver as open handle ([#11123](https://github.com/facebook/jest/pull/11123))
 - `[jest-core]` Use `WeakRef` to hold timers when detecting open handles ([#11277](https://github.com/facebook/jest/pull/11277))
 - `[jest-core]` Correctly detect open handles that were created in test functions using `done` callbacks ([#11382](https://github.com/facebook/jest/pull/11382))
+- `[jest-core]` Do not collect `RANDOMBYTESREQUEST` as open handles ([#11278](https://github.com/facebook/jest/pull/11278))
 - `[jest-diff]` [**BREAKING**] Use only named exports ([#11371](https://github.com/facebook/jest/pull/11371))
 - `[jest-each]` [**BREAKING**] Ignore excess words in headings ([#8766](https://github.com/facebook/jest/pull/8766))
 - `[jest-each]` Support array index with template strings ([#10763](https://github.com/facebook/jest/pull/10763))

e2e/__tests__/detectOpenHandles.ts

@@ -71,6 +71,17 @@ it('does not report promises', () => {
   expect(textAfterTest).toBe('');
 });
 
+it('does not report crypto random data', () => {
+  // The test here is basically that it exits cleanly without reporting anything (does not need `until`)
+  const {stderr} = runJest('detect-open-handles', [
+    'crypto',
+    '--detectOpenHandles',
+  ]);
+  const textAfterTest = getTextAfterTest(stderr);
+
+  expect(textAfterTest).toBe('');
+});
+
 onNodeVersions('>=11.10.0', () => {
   it('does not report ELD histograms', () => {
     const {stderr} = runJest('detect-open-handles', [

e2e/detect-open-handles/__tests__/crypto.js

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const {randomFillSync} = require('crypto');
+
+test('randomFillSync()', () => {
+  const buf = Buffer.alloc(10);
+  randomFillSync(buf);
+});

packages/jest-core/src/collectHandles.ts

@@ -63,7 +63,8 @@ export default function collectHandles(): HandleCollectionResult {
         type === 'PROMISE' ||
         type === 'TIMERWRAP' ||
         type === 'ELDHISTOGRAM' ||
-        type === 'PerformanceObserver'
+        type === 'PerformanceObserver' ||
+        type === 'RANDOMBYTESREQUEST'
       ) {
         return;
       }