xBehave.net re-write for bwatts

gistfile1.cs

public class RuntimeFeature
{
        [Scenario]
        public void ApplyDependentCalculation()
	{
		int _left1;
		int _right1;
		int _left2;
		Variable _outputVariable1;
		Variable _outputVariable2;
		GraspRuntime _runtime;

                "Given (fill in something sensible here)"
                    .Given(() =>
		    {
			_left1 = 1;
			_right1 = 2;

			_left2 = 10;

			_outputVariable1 = new Variable("Grasp", "Output1", typeof(int));
			_outputVariable2 = new Variable("Grasp", "Output2", typeof(int));

			var calculation1 = new Calculation(_outputVariable1, Expression.Add(Expression.Constant(_left1), Expression.Constant(_right1)));
			var calculation2 = new Calculation(_outputVariable2, Expression.Add(Expression.Constant(_left2), Variable.Expression(_outputVariable1)));

			var schema = new GraspSchema(Enumerable.Empty<Variable>(), new[] { calculation1, calculation2 });

			var executable = schema.Compile();

			_runtime = executable.GetRuntime(A.Fake<IRuntimeSnapshot>());
		    };

                "When applying calculations"
                    .When(() => _runtime.ApplyCalculations());

		"Then the output variable is set to the correct value"
                    .Then(() => Assert.That(_runtime.GetVariableValue(_outputVariable1), Is.EqualTo(_left1 + _right1)));
		}

		"And the output variable 2 is set to the correct value"
                    .And(() => 
                    {
			var outputVariable1Value = (int) _runtime.GetVariableValue(_outputVariable1);
			Assert.That(_runtime.GetVariableValue(_outputVariable2), Is.EqualTo(_left2 + outputVariable1Value));
                    };
	}
}