unit testing for java class using groovy

For this code snippet

@Component
public class StorageResource {

        @Autowired
        private Storage storage;

        public String addItem(StorageItem item) {
            WrappedStorageItem wsi = new WrappedStorageItem(item);
            storage.add(wsi);
            return wsi.getId();
        }

}

the unit test looks something like this

@Test
void testCase() {
    StorageResource storageResource = new StorageResource();
    Storage storageMock = createMock(Storage.class);
    Whitebox.setInternalState(storageResource, Storage.class, storage);

    StorageItem item = new StorageItem();
    WrappedStorageItem wos = new WrappedStorageItem(item);

    expectNew(WrappedStorageItem.class, item).andReturn(wos);
    storageMock.add(wos);
    expectLastCall();
    replayAll();
    storageResource.addItem(item);
    verifyAll();
}

But how the test will look like if I use groovy? Will it be less verbose?