Step file to invoke existing scenarios using naming convention.

ScenarioInvoker_Steps.cs

[Binding]
public class ScenarioInvoker_Steps
{
    [Given(@"Successfully run scenario (.*)")]
    public void GivenSuccessfullyRunScenario(String featureAndScenarioName)
    {
        var parts = featureAndScenarioName.Split(new string[] {"S_"}, StringSplitOptions.RemoveEmptyEntries);
        if(parts.Length != 2)
            throw new ArgumentException("Invalid scenario reference string \"{0}\". Expecting string to be in the format F_N Feature Name S_N Scenario Name");
            
        String featureName = parts[0]; 
        String scenarioName = "S_" + parts[1]; 

        var feature = FeatureLocator.FindFeatureById(featureName);

        if(feature == null)
            throw new ArgumentException("Unable to find feature by id \"{0}\"".FormatWith(featureName));

        feature.SetUp();

        var scenario = feature.FindScenarioForId(scenarioName);

        if(scenario == null)
            throw new ArgumentException("Unable to find scenario by id \"{0}\"".FormatWith(scenarioName));

        scenario.Run();
    }
}