Coming soon! See https://github.com/flutter/devtools/issues/3951.

What is this?

This is helper for testing leak_tracker.

They are separated from leak_tracker to make sure testing code is not used in production.

How to use the helpers?

To test for leaks with descriptive messages, use isLeakFree against a Leaks instance:

final leaks = await LeakTracking.collectLeaks();
expect(leaks, isLeakFree);

See more examples in end_to_end_test.dart.