// when
CmmnActivity activity = handler.handleElement(planItem, context);
// then
CaseTaskActivityBehavior behavior = (CaseTaskActivityBehavior) activity.getActivityBehavior();
CallableElement callableElement = behavior.getCallableElement();
ParameterValueProvider businessKeyValueProvider = callableElement.getBusinessKeyValueProvider();
assertNotNull(businessKeyValueProvider);
assertTrue(businessKeyValueProvider instanceof ElValueProvider);
ElValueProvider valueProvider = (ElValueProvider) businessKeyValueProvider;
assertEquals(businessKey, valueProvider.getExpression().getExpressionText());