ashgti wrote:

> I believe you, but I don't understand. Since this restricts the set of 
> possible message orderings (does it?), I would naively expect that a test 
> which worked previously (with the wider set of orderings) would continue to 
> work afterwards.
> 
> The only way I can imagine this not being true is if the tests weren't 100% 
> correct (i.e., they were flaky), but whereas previously the "bad" case would 
> happen 0.1% of the time, this patch now makes it the 100% case. And it's 
> easier to make the test always expect the (previously) bad case than it is to 
> accept all of the technically legal orderings. Is that's what happening? 
> Maybe an example would help...

I think our tests are not fully specifying their expected state. For example, 
lldb/test/API/tools/lldb-dap/console/TestDAP_console.py 
`TestDAP_console.test_diagnositcs` was performing an evaluate and then using 
`get_important` to fetch output events with category 'important'. 

With the change, the `important` output was always coming after the request was 
handled. I updated the test to use a `self.collect_important` instead of 
`get_important`. Previously, this could have been emitted while the request was 
being handled, but now the output would only ever be emitted after the request 
handler is finished.

https://github.com/llvm/llvm-project/pull/139669
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