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

components/safe_browsing_db/v4_local_database_manager_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/files/scoped_temp_dir.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "base/test/test_simple_task_runner.h"
 #include "components/safe_browsing_db/v4_database.h"
@@ skipping 64 matching lines @@
 
   void ForceDisableLocalDatabaseManager() {
     v4_local_database_manager_->enabled_ = false;
   }
 
   const V4LocalDatabaseManager::QueuedChecks& GetQueuedChecks() {
     return v4_local_database_manager_->queued_checks_;
   }
 
   void ReplaceV4Database(const StoreAndHashPrefixes& store_and_hash_prefixes) {
+    // Make sure that VerifyChecksum runs before we reset.
+    task_runner_->RunPendingTasks();
+    base::RunLoop().RunUntilIdle();
+
     v4_local_database_manager_->v4_database_.reset(new FakeV4Database(
         task_runner_, base::MakeUnique<StoreMap>(), store_and_hash_prefixes));
   }
 
-  void ResetV4Database() { v4_local_database_manager_->v4_database_.reset(); }
+  void ResetV4Database() {
+    // Make sure that VerifyChecksum runs before we reset.
+    task_runner_->RunPendingTasks();
+    base::RunLoop().RunUntilIdle();
+
+    v4_local_database_manager_->v4_database_.reset();
+  }
 
   void StartLocalDatabaseManager() {
     v4_local_database_manager_->StartOnIOThread(NULL, V4ProtocolConfig());
 
     task_runner_->RunPendingTasks();
     base::RunLoop().RunUntilIdle();
   }
 
   void StopLocalDatabaseManager() {
     v4_local_database_manager_->StopOnIOThread(true);
@@ skipping 109 matching lines @@
   ResetV4Database();
   v4_local_database_manager_->CheckBrowseUrl(url, &client);
   // The database is unavailable so the check should get queued.
   EXPECT_EQ(1ul, GetQueuedChecks().size());
 
   StopLocalDatabaseManager();
   EXPECT_TRUE(GetQueuedChecks().empty());
 }
 
 }  // namespace safe_browsing