I’m working on NUnit tests where each test case requires starting a service that uses a fixed port. The challenge I’m facing is ensuring that the service setup ([SetUp] method) runs only once per test fixture class and that ports used by the service are available and not already in use by another test case. Here are the details:

I’m working on a .NET project using NUnit for testing. I have a base test class BaseA that initializes a shared object in its constructor. My derived class A contains several test methods. I’m using the [Parallelizable(ParallelScope.Self)] attribute to allow parallel execution of tests within this class. Here is a simplified version of my setup: