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test-exempt: fixes flaky test.

though the precommits don't agree. :-)

though the precommits don't agree. :-)

heh. I think they may be different (they look unrelated to this test) and wondered if they were related to the tree being red. I'll rebase once the tree is fixed and run them a few times to check it all looks good. Thanks!

There are still some flakes here, but they seem unrelated to this change (or the flake it tries to fix), and look like the issue being tracked in #92042 (comment).

So I'll re-run this until it's green (and verify the only flakes I see in the meantime are not the one this aims to fix) and then land when the tree is open.

NoSuchMethodError: The getter 'uri' was called on null.
Receiver: null
Tried calling: uri
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:68:5)
#1      ResidentRunner.printDebuggerList (package:flutter_tools/src/resident_runner.dart:1393:47)
#2      FlutterResidentDevtoolsHandler.serveAndAnnounceDevTools (package:flutter_tools/src/resident_devtools_handler.dart:96:23)
<asynchronous suspension>