Implement lossy pref behavior for JsonPrefStore.

base/files/important_file_writer_unittest.cc

 // Copyright (c) 2012 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/important_file_writer.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 81 matching lines @@
  protected:
   SuccessfulWriteObserver successful_write_observer_;
   FilePath file_;
   MessageLoop loop_;
 
  private:
   ScopedTempDir temp_dir_;
 };
 
 TEST_F(ImportantFileWriterTest, Basic) {
-  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
+  ImportantFileWriterImpl writer(file_, ThreadTaskRunnerHandle::Get());
   EXPECT_FALSE(PathExists(writer.path()));
   EXPECT_FALSE(successful_write_observer_.GetAndResetObservationState());
   writer.WriteNow(make_scoped_ptr(new std::string("foo")));
   RunLoop().RunUntilIdle();
 
   EXPECT_FALSE(successful_write_observer_.GetAndResetObservationState());
   ASSERT_TRUE(PathExists(writer.path()));
   EXPECT_EQ("foo", GetFileContent(writer.path()));
 }
 
 TEST_F(ImportantFileWriterTest, BasicWithSuccessfulWriteObserver) {
-  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
+  ImportantFileWriterImpl writer(file_, ThreadTaskRunnerHandle::Get());
   EXPECT_FALSE(PathExists(writer.path()));
   EXPECT_FALSE(successful_write_observer_.GetAndResetObservationState());
   successful_write_observer_.ObserveNextSuccessfulWrite(&writer);
   writer.WriteNow(make_scoped_ptr(new std::string("foo")));
   RunLoop().RunUntilIdle();
 
   // Confirm that the observer is invoked.
   EXPECT_TRUE(successful_write_observer_.GetAndResetObservationState());
   ASSERT_TRUE(PathExists(writer.path()));
   EXPECT_EQ("foo", GetFileContent(writer.path()));
@@ skipping 13 matching lines @@
   EXPECT_FALSE(successful_write_observer_.GetAndResetObservationState());
   writer.WriteNow(make_scoped_ptr(new std::string("baz")));
   RunLoop().RunUntilIdle();
 
   EXPECT_FALSE(successful_write_observer_.GetAndResetObservationState());
   ASSERT_TRUE(PathExists(writer.path()));
   EXPECT_EQ("baz", GetFileContent(writer.path()));
 }
 
 TEST_F(ImportantFileWriterTest, ScheduleWrite) {
-  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
+  ImportantFileWriterImpl writer(file_, ThreadTaskRunnerHandle::Get());
   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
   EXPECT_FALSE(writer.HasPendingWrite());
   DataSerializer serializer("foo");
   writer.ScheduleWrite(&serializer);
   EXPECT_TRUE(writer.HasPendingWrite());
   ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, MessageLoop::QuitWhenIdleClosure(),
       TimeDelta::FromMilliseconds(100));
   MessageLoop::current()->Run();
   EXPECT_FALSE(writer.HasPendingWrite());
   ASSERT_TRUE(PathExists(writer.path()));
   EXPECT_EQ("foo", GetFileContent(writer.path()));
 }
 
 TEST_F(ImportantFileWriterTest, DoScheduledWrite) {
-  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
+  ImportantFileWriterImpl writer(file_, ThreadTaskRunnerHandle::Get());
   EXPECT_FALSE(writer.HasPendingWrite());
   DataSerializer serializer("foo");
   writer.ScheduleWrite(&serializer);
   EXPECT_TRUE(writer.HasPendingWrite());
   writer.DoScheduledWrite();
   ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, MessageLoop::QuitWhenIdleClosure(),
       TimeDelta::FromMilliseconds(100));
   MessageLoop::current()->Run();
   EXPECT_FALSE(writer.HasPendingWrite());
   ASSERT_TRUE(PathExists(writer.path()));
   EXPECT_EQ("foo", GetFileContent(writer.path()));
 }
 
 TEST_F(ImportantFileWriterTest, BatchingWrites) {
-  ImportantFileWriter writer(file_, ThreadTaskRunnerHandle::Get());
+  ImportantFileWriterImpl writer(file_, ThreadTaskRunnerHandle::Get());
   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
   DataSerializer foo("foo"), bar("bar"), baz("baz");
   writer.ScheduleWrite(&foo);
   writer.ScheduleWrite(&bar);
   writer.ScheduleWrite(&baz);
   ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, MessageLoop::QuitWhenIdleClosure(),
       TimeDelta::FromMilliseconds(100));
   MessageLoop::current()->Run();
   ASSERT_TRUE(PathExists(writer.path()));
   EXPECT_EQ("baz", GetFileContent(writer.path()));
 }
 
 }  // namespace base