gui-cs.Terminal.Gui/Tests/UnitTestsParallelizable/runsettings.xml

<?xml version="1.0" encoding="utf-8"?>
<RunSettings>

	<!-- New: xUnit Config for Stop-on-Fail -->
	<xUnit>
		<ParallelizeAssembly>true</ParallelizeAssembly>
		<ParallelizeTestCollections>true</ParallelizeTestCollections>
		<!-- Enable collection parallelism -->
		<MaxParallelThreads>2x</MaxParallelThreads>
		<!-- Or 'unlimited' / '2x' for CPU multiplier -->
		<StopOnFail>true</StopOnFail>
		<!-- Still stop on first failure -->
	</xUnit>

</RunSettings>