public <T> T addStage( Class<T> stageClass ) {
        return getScenario().addStage( stageClass );
    }
Add a new stage class to the scenario.
@param stageClass the class with the step definitions
@return a new instance of the given class enhanced by JGiven
jgiven-core/src/main/java/com/tngtech/jgiven/base/ScenarioTestBase.java