It's inconvenient to have different base classes for tests with results and test without results

[IharBury]

Often there are many tests for the same subject sharing most of the givens and having different whens. It's convenient to reuse them as a common base class like:

public abstract class Given_a_computer : GivenSubject<IComputer>
{
  public Given_a_computer()
  {
     Given(() =>
     {
       WithSubject(new Computer());
     }
  }
}

public class When_Windows_is_installed : Given_a_computer
{
  public When_Windows_is_installed()
  {
    When(() => Subject.InstallWindows());
  }

  [Fact]
  public void Then_it_must_die()
  {
    Subject.Should().BeDead();
  }
}

public class When_Linux_is_installed : Given_a_computer
{
  public When_Windows_is_installed()
  {
    When(() => Subject.InstallLinux());
  }

  [Fact]
  public void Then_it_should_work()
  {
    Subject.Should().Work();
  }
}

However, it's not possible to have a common base class for test with results and without results because they must have different Chill base class (GivenSubject<TSubject> vs GivenSubject<TSubject, TResult>, or GivenWhenThen vs GivenWhenThen<TResult>).