public void addNestedStep( StepModel stepModel ) {
        if( nestedSteps == null ) {
            nestedSteps = Lists.newArrayList();
        }
        nestedSteps.add( stepModel );
    }
Indicates if the parent step has failed.
jgiven-core/src/main/java/com/tngtech/jgiven/report/model/StepModel.java