| iframe.html |
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| image.png |
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| resizeTestHelper.js |
ResizeTestHelper is a framework to test ResizeObserver
notifications. Use it to make assertions about ResizeObserverEntries.
This framework is needed because ResizeObservations are
delivered asynchronously inside the event loop.
Features:
- can queue multiple notification steps in a test
- handles timeouts
- returns Promise that is fulfilled when test completes.
Use to chain tests (since parallel async ResizeObserver tests
would conflict if reusing same DOM elements).
Usage:
create ResizeTestHelper for every test.
Make assertions inside notify, timeout callbacks.
Start tests with helper.start()
Chain tests with Promises.
Counts animation frames, see startCountingRaf
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