Improve WebChannel mocking #3647
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@@ Coverage Diff @@
## main #3647 +/- ##
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- Coverage 88.90% 88.87% -0.03%
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Files 258 258
Lines 21498 21542 +44
Branches 5494 5504 +10
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+ Hits 19112 19146 +34
- Misses 2212 2222 +10
Partials 174 174
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julienw
approved these changes
Nov 16, 2021
| @@ -124,5 +127,7 @@ describe('app/DragAndDrop', () => { | |||
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| fireEvent.dragLeave(dragAndDrop); | |||
| expect(overlay.classList).not.toContain('dragging'); | |||
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| restoreOriginals(); | |||
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We don't need to add all these restoreOriginals calls, because jest.spyOn spys are automatically removed after each test. See
Lines 25 to 28 in bead77f
(historical note: in the past we used to do this with some jest configuration, but this wasn't working properly, see jestjs/jest#9896 especially. That's why we're doing it manually in the setup file. I don't know if that improved.)
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Oh, perfect! That should make the patch a lot simpler.
This means that these functions will be usable from UrlManager.test.js. I'll make use of that in a future PR.
The WebChannel mocking now calls the original functions for addEventListener, removeEventListener, and dispatchEvent. This means that it won't interfere with other uses of these APIs. One example of such a use is the popstate event: UrlManager.test.js has a test which makes sure that the URL state is restored when going backwards in history. Using a mocked WebChannel in that test broke it because the popstate event was no longer being dispatched.
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This PR has two commits which improve the mock WebChannel which we use in tests: The code is moved to a different file, it no longer breaks other uses of window.dispatchEvent, and it adds a way to clean up after the test.