// transform casePlanModel as parent
CmmnActivity parent = new CasePlanModelHandler().handleElement(casePlanModel, context);
context.setParent(parent);
// transform Sentry
CmmnSentryDeclaration firstSentryDeclaration = new SentryHandler().handleElement(sentry1, context);
CmmnSentryDeclaration secondSentryDeclaration = new SentryHandler().handleElement(sentry2, context);
// when
CmmnActivity newActivity = handler.handleElement(planItem, context);
// then