AU: Verify that the applied delta update matches the server-sent hashes.

delta_performer_unittest.cc

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sys/mount.h>
 #include <inttypes.h>
 
 #include <algorithm>
 #include <string>
 #include <vector>
@@ skipping 268 matching lines @@
   const size_t kBytesPerWrite = 5;
   for (size_t i = 0; i < delta.size(); i += kBytesPerWrite) {
     size_t count = min(delta.size() - i, kBytesPerWrite);
     EXPECT_EQ(count, performer.Write(&delta[i], count));
   }
 
   // Wrapper around close. Returns 0 on success or -errno on error.
   EXPECT_EQ(0, performer.Close());
 
   CompareFilesByBlock(old_kernel, new_kernel);
+  CompareFilesByBlock(a_img, b_img);
 
   vector<char> updated_kernel_partition;
   EXPECT_TRUE(utils::ReadFile(old_kernel, &updated_kernel_partition));
   EXPECT_EQ(0, strncmp(&updated_kernel_partition[0], new_data_string,
                        strlen(new_data_string)));
 
   EXPECT_TRUE(utils::FileExists(kUnittestPublicKeyPath));
   EXPECT_TRUE(performer.VerifyPayload(
       kUnittestPublicKeyPath,
       OmahaHashCalculator::OmahaHashOfData(delta),
       delta.size()));
+  EXPECT_TRUE(performer.VerifyAppliedUpdate(a_img, old_kernel));
 }
 
 TEST(DeltaPerformerTest, NewFullUpdateTest) {
   vector<char> new_root(20 * 1024 * 1024);
   vector<char> new_kern(16 * 1024 * 1024);
   const off_t kChunkSize = 128 * 1024;
   FillWithData(&new_root);
   FillWithData(&new_kern);
 
   string new_root_path;
@@ skipping 60 matching lines @@
   op.clear_src_extents();
   *(op.add_src_extents()) = ExtentForRange(5, 3);
   EXPECT_TRUE(DeltaPerformer::IsIdempotentOperation(op));
   *(op.add_dst_extents()) = ExtentForRange(20, 6);
   EXPECT_TRUE(DeltaPerformer::IsIdempotentOperation(op));
   *(op.add_src_extents()) = ExtentForRange(19, 2);
   EXPECT_FALSE(DeltaPerformer::IsIdempotentOperation(op));
 }
 
 }  // namespace chromeos_update_engine