Example of abstract class I use for unit testing with XUnit

UnitTestBase.cs

public abstract class UnitTestBase : IUseFixture<UnitTestFixture>{
  
  public void SetFixture(UnitTestFixture data){
    Fixture = data;
    AdditionalFixtureConfiguration();
  }
  
  protected UnitTestFixture Fixture {get;set;}
  
  public virtual void AdditionalFixtureConfiguration(){
    
  }
}

public class UnitTestFixture : IDisposable{
  public override void Dispose(){
    base.Dispose();
    Dispose(true);
    GC.SuppressFinalize(this);
  }
  
  protected virtual void Dispose(bool disposing){
    if (!disposing)return;
    
    //Free other managed objects here
  }
}