Bug: Memory Leak in yarn test

[kulla]

We have a memory leak in yarn test which results in failing test (see for example https://github.com/serlo/api.serlo.org/runs/5821681118?check_suite_focus=true):

yarn test --logHeapUsage
 PASS  __tests__/schema/notification.ts (32.181 s, 740 MB heap size)
 PASS  __tests__/schema/uuid/abstract-repository.ts (23.637 s, 1187 MB heap size)
 PASS  __tests__/schema/uuid/user.ts (13.955 s, 564 MB heap size)
 PASS  __tests__/schema/entity/add-revision.ts (8.045 s, 562 MB heap size)
 PASS  __tests__/schema/entity/create.ts (7.189 s, 742 MB heap size)
 PASS  __tests__/schema/uuid/abstract-uuid.ts (7.82 s, 614 MB heap size)
 PASS  __tests__/schema/user/delete-bots.ts (6.179 s, 728 MB heap size)
 PASS  __tests__/schema/thread/set-thread-archived.ts (6.141 s, 692 MB heap size)
 PASS  __tests__/schema/thread/create-comment.ts (5.26 s, 844 MB heap size)
 PASS  __tests__/schema/thread/create-thread.ts (5.149 s, 975 MB heap size)
 PASS  __tests__/schema/thread/thread.ts (1116 MB heap size)
 PASS  __tests__/schema/user/delete-regular-users.ts (1209 MB heap size)
 PASS  __tests__/schema/entity/checkout-revision.ts (1325 MB heap size)
 PASS  __tests__/schema/cache.ts (1426 MB heap size)
 PASS  __tests__/schema/entity/reject-revision.ts (1535 MB heap size)
 PASS  __tests__/schema/events.ts (1657 MB heap size)
 PASS  __tests__/internals/sentry.ts (1729 MB heap size)
 PASS  __tests__/schema/uuid/course.ts (1842 MB heap size)
 PASS  __tests__/schema/subject.ts (1936 MB heap size)
 PASS  __tests__/schema/user/set-email.ts (2010 MB heap size)
 PASS  __tests__/schema/page/checkout-revision.ts (2117 MB heap size)
 PASS  __tests__/schema/uuid/abstract-taxonomy-term-child.ts (2218 MB heap size)
 PASS  __tests__/schema/subscription.ts (2301 MB heap size)
 PASS  __tests__/schema/page/reject-revision.ts (1165 MB heap size)
 PASS  __tests__/schema/uuid/abstract-navigation-child.ts (1264 MB heap size)
 PASS  __tests__/schema/taxonomy-term/set-name-and-description.ts (1353 MB heap size)
 PASS  __tests__/schema/authorization.ts (1441 MB heap size)
 PASS  __tests__/schema/uuid/grouped-exercise.ts (1518 MB heap size)
 PASS  __tests__/schema/page/add-revision.ts (1601 MB heap size)
 PASS  __tests__/schema/user/set-description.ts (1689 MB heap size)
 PASS  __tests__/schema/page/create.ts (1770 MB heap size)
 PASS  __tests__/schema/thread/set-comment-state.ts (1852 MB heap size)
 PASS  __tests__/schema/thread/set-thread-state.ts (1943 MB heap size)
 PASS  __tests__/schema/uuid/course-page.ts (2012 MB heap size)
 PASS  __tests__/schema/uuid/exercise-group.ts (2101 MB heap size)
 PASS  __tests__/schema/uuid/page.ts (2179 MB heap size)
 PASS  __tests__/schema/uuid/solution.ts (2255 MB heap size)
 PASS  __tests__/schema/uuid/set-state.ts (2337 MB heap size)
 PASS  __tests__/schema/uuid/article.ts (2417 MB heap size)
 PASS  __tests__/schema/metadata.ts (2496 MB heap size)
 PASS  __tests__/schema/uuid/video.ts (2570 MB heap size)
 PASS  __tests__/schema/uuid/abstract-exercise.ts (1690 MB heap size)
 PASS  __tests__/schema/uuid/event.ts (1770 MB heap size)
 PASS  __tests__/schema/uuid/exercise.ts (1848 MB heap size)
 PASS  __tests__/schema/uuid/applet.ts (1925 MB heap size)
 PASS  __tests__/schema/uuid/taxonomy-term.ts (1998 MB heap size)
 PASS  __tests__/schema/user/potential-spam-users.ts (2072 MB heap size)
 PASS  __tests__/schema/license.ts (2150 MB heap size)
 PASS  __tests__/schema/uuid/unsupported-uuid.ts (2209 MB heap size)
 PASS  __tests__/examples/data-sources/how-to-create-a-mutation.ts (2274 MB heap size)
 PASS  __tests__/examples/data-sources/how-to-create-a-query.ts (2341 MB heap size)
 PASS  __tests__/internals/authentication.ts (2404 MB heap size)
 PASS  __tests__/schema/connection.ts (2467 MB heap size)
 PASS  __tests__/internals/data-sources.ts (2534 MB heap size)

See https://making.close.com/posts/finding-the-cause-of-a-memory-leak-in-jest

[kulla]

Related:

• [Bug]: Memory consumption issues on Node JS 16.11.0+ jestjs/jest#11956
• Jest leaks memory from required modules with closures over imports jestjs/jest#6814

[CodingDive]

Upstream issues
https://chromium-review.googlesource.com/c/v8/v8/+/3172764
nodejs/node#42080
nodejs/node#44211

[kulla]

moved to backlog since we need to wait until jestjs/jest#11956 is fixed