testConfig
A TestConfig for aroundAll / aroundEach / context / timeout wrappers.
Set concurrency via execution, never TestConfig.invocation(...): matrix derives invocation from execution, and a conflicting one here can't be removed (TestBalloon configs are opaque) — it is overridden and can break test discovery. A virtual-time testScope(...) applies only to sequential execution (matrix auto-disables it under concurrent execution); prefer enabling TestScope on the TestSession, and for a timeout under concurrency use aroundEach/aroundAll + withTimeout rather than testScope's timeout.