How to use child_class_is_level_2 method of NSpec.Tests.WhenRunningSpecs.parent_context class

1using FluentAssertions;
2using NUnit.Framework;
3
4namespace NSpec.Tests.WhenRunningSpecs
5{
6    public class describe_levels_inheritance : when_running_specs
7    {
8        class parent_context : nspec { }
9
10        class child_context : parent_context
11        {
12            void it_is()
13            {
14                Assert.That("is", Is.EqualTo("is"));
15            }
16        }
17
18        [SetUp]
19        public void Setup()
20        {
21            Run(new[] { typeof(parent_context), typeof(child_context) });
22        }
23
24        [Test]
25        public void parent_class_is_level_1()
26        {
27            TheContext("parent context").Level.Should().Be(1);
28        }
29
30        [Test]
31        public void child_class_is_level_2()
32        {
33            TheContext("child context").Level.Should().Be(2);
34        }
35    }
36}

Source: describe_levels_inheritance.cs

using FluentAssertions;
using NUnit.Framework;

namespace NSpec.Tests.WhenRunningSpecs
{
    public class describe_levels_inheritance : when_running_specs
    {
        class parent_context : nspec { }

        class child_context : parent_context
        {
            void it_is()
            {
                Assert.That("is", Is.EqualTo("is"));
            }
        }

        [SetUp]
        public void Setup()
        {
            Run(new[] { typeof(parent_context), typeof(child_context) });
        }

        [Test]
        public void parent_class_is_level_1()
        {
            TheContext("parent context").Level.Should().Be(1);
        }

        [Test]
        public void child_class_is_level_2()
        {
            TheContext("child context").Level.Should().Be(2);
        }
    }
}