PVer4: Test checksum on startup outside the hotpath of DB load

components/safe_browsing_db/v4_store_unittest.cc

 // Copyright 2016 The Chromium 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 "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/test/test_simple_task_runner.h"
@@ skipping 780 matching lines @@
   // \xb2m\x0e\xe0\xe7\xe9P9\x9b\x1cB"\xf5\xde\x05\xe0d%\xb4\xc9\x95\xe9"
 
   HashPrefixMap prefix_map_old;
   EXPECT_EQ(APPLY_UPDATE_SUCCESS,
             V4Store::AddUnlumpedHashes(4, "2222", &prefix_map_old));
   EXPECT_EQ(CHECKSUM_MISMATCH_FAILURE,
             V4Store(task_runner_, store_path_)
                 .MergeUpdate(prefix_map_old, HashPrefixMap(), nullptr, "aawc"));
 }
 
+TEST_F(V4StoreTest, TestChecksumErrorOnStartup) {
+  HashPrefixMap prefix_map_additions;
+  EXPECT_EQ(APPLY_UPDATE_SUCCESS,
+            V4Store::AddUnlumpedHashes(4, "2222", &prefix_map_additions));
+  V4Store store(task_runner_, store_path_);
+  EXPECT_EQ(APPLY_UPDATE_SUCCESS,
+            store.MergeUpdate(HashPrefixMap(), prefix_map_additions, nullptr,
+                              "aawc"));
+  EXPECT_FALSE(store.hash_prefix_map_.empty());
+
+  task_runner_->RunPendingTasks();
+  base::RunLoop().RunUntilIdle();
+
+  EXPECT_TRUE(store.hash_prefix_map_.empty());
+}
+
 }  // namespace safe_browsing