new MutationFixture() {
@Override
protected void setupExpectations() throws Exception {
storageUtil.expectWriteOperation();
storageUtil.lockStore.removeLock(lockKey);
streamMatcher.expectTransaction(Op.removeLock(new RemoveLock(lockKey.newBuilder())))
.andReturn(position);
}
@Override
protected void performMutations(MutableStoreProvider storeProvider) {