InstanceService instanceService = EasyMock.createMock(InstanceService.class);
EasyMock.expect(instanceService.getInstance("test instance")).andReturn(inst);
EasyMock.replay(instanceService);
InstancesMBean instanceServiceMBean = new Instances(instanceService);
instanceServiceMBean.changeJavaOpts("test instance", "new opts");
EasyMock.verify(instanceService);
EasyMock.verify(inst);
}