From 2a9530f3f4bddd2139531daebf84d41abf8ab3eb Mon Sep 17 00:00:00 2001
From: fzyzcjy <5236035+fzyzcjy@users.noreply.github.com>
Date: Tue, 9 May 2023 04:25:12 +0800
Subject: [PATCH] Fix that `flutter test` does not understand `concurrency`
 (#125942)

Close https://github.com/flutter/flutter/issues/125940

I will add tests if this PR looks roughly OK :)

The fix mainly mimics https://github.com/flutter/flutter/pull/115160 - just remove the default argument.

p.s. I ran into this bug when wanting to set concurrency in my dart_test.yaml for one set of my tests which I need to be executed without parallalization.