new MutationFixture() {
@Override
protected void setupExpectations() throws Exception {
storageUtil.expectWriteOperation();
storageUtil.taskStore.deleteTasks(taskIds);
streamMatcher.expectTransaction(Op.removeTasks(new RemoveTasks(taskIds)))
.andReturn(position);
}
@Override
protected void performMutations(MutableStoreProvider storeProvider) {