Add integration test for XOR ops

Test: th
Bug: 201099341
Change-Id: I36f4c2da25f23b3dcdfa0852a9dc01f896a292f1
diff --git a/payload_consumer/vabc_partition_writer.cc b/payload_consumer/vabc_partition_writer.cc
index a11bdf4..9db88a9 100644
--- a/payload_consumer/vabc_partition_writer.cc
+++ b/payload_consumer/vabc_partition_writer.cc
@@ -314,7 +314,8 @@
   TEST_AND_RETURN_FALSE(cow_writer_ != nullptr);
   TEST_AND_RETURN_FALSE(cow_writer_->AddLabel(kEndOfInstallLabel));
   TEST_AND_RETURN_FALSE(cow_writer_->Finalize());
-  return cow_writer_->VerifyMergeOps();
+  TEST_AND_RETURN_FALSE(cow_writer_->VerifyMergeOps());
+  return true;
 }
 
 VABCPartitionWriter::~VABCPartitionWriter() {