Unable to disable parallel execution in vstest.console.exe

[kfrajtak]

Hi,
I am trying to completely disable parallel execution of tests. The reason is that the legacy code base has lots of static code that is globally configured.
What I have tried is

• [assembly: CollectionBehavior(DisableTestParallelization = true)]
• [assembly: Parallelize(Workers = 1, Scope = ExecutionScope.MethodLevel)] (from Microsoft.VisualStudio.TestTools.UnitTesting namespace)
• xunit.runner.json as shown at the bottom

But still my tests are executed in parallel (or on multiple threads) - see the numbers in brackets where I am dumping value of System.Threading.Thread.CurrentThread.ManagedThreadId:

[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.4.1 (32-bit Desktop .NET 4.0.30319.42000)
[xUnit.net 00:00:11.35]   Discovering: TestAssembly (app domain = on [shadow copy], method display = Method, method display options = None)
[xUnit.net 00:00:19.72]   Discovered:  TestAssembly (found 253 test cases)
[xUnit.net 00:00:19.73]   Starting:    TestAssembly (parallel test collections = off, max threads = 1)
[xUnit.net 00:00:37.76]         [9] Info: ShowOnCustomerDisplay 9
[xUnit.net 00:00:37.76]
  ? Test3 [337ms]
  ? Test4 [335ms]
[xUnit.net 00:00:38.05]     Test5 [PASS]
[xUnit.net 00:00:38.05]       Output:
[xUnit.net 00:00:38.05]         [19] Info: ShowOnCustomerDisplay 19
[xUnit.net 00:00:38.05]
[xUnit.net 00:00:38.33]     Test6 [PASS]
[xUnit.net 00:00:38.33]       Output:
[xUnit.net 00:00:38.33]         [20] Info: ShowOnCustomerDisplay 20

Content of xunit.runner.json

{
  "$schema": "https://xunit.net/schema/current/xunit.runner.schema.json",
  "diagnosticMessages": true,
  "methodDisplay": "method",
  "maxParallelThreads": 1,
  "parallelizeAssembly": false,
  "parallelizeTestCollections": false
}

[bradwilson]

Can you provide a repro project?

[kfrajtak]

I am sorry, that is not possible. It is not a big issue right now. I think my assumption was wrong and Xunit runs each test in a thread from the ThreadPool.