You can use use a test event and process that with your flow:
DefaultMuleMessage message = new DefaultMuleMessage(activity, muleContext);
MuleEvent event = getTestEvent(message);
event.setSessionVariable("edusKey", "1234567890");
Flow flow = (Flow) getFlowConstruct("my-flow");
MuleEvent responseEvent = flow.process(event);
responseEvent.getMessageAsString();