fix(emit): force event handling even with fake timers #1856
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I actually think this is a clever solution that should prevent others from ever having to worry about the fake timers issue, and everything will "just work" as expected. This was very similar to my first fix in my project's codebase when I discovered the issue, but I had to add it to every event using the second arg to trigger.
Although it's tied to behavior in vue internals that could change, I think that's fine since this is the official testing library for vue. The comment does a good job of explaining what the workaround is for, and if vue changes implementation it should be easy to find the code that needs to be understood to fix it if it breaks.
Nice work!
tests/trigger.spec.ts
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This line with wrapper.setProps isn't needed, I forgot to remove it from an earlier version when I was tinkering with the repro.
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Fixes #1854
I'm not 100% convinced this is the proper way to fix it, but I don't have a better idea at the moment.
Setting
_vtsto Date.now() + 1 tricks Vue into thinking it has to handle the event even ifDate.now()is faked and always returns the same value https://github.com/vuejs/core/blob/5ee40532a63e0b792e0c1eccf3cf68546a4e23e9/packages/runtime-dom/src/modules/events.ts#L100-L104I hope this doesn't introduce other subtle issues. It would be great to only do this if the test is running with a fake Date, but I don't know how we can find out reliably for jest or vitest or even a manually mocked Date object.