Adds async interface method to PersistentPrefStore.

chrome/common/json_pref_store_unittest.cc

 // Copyright (c) 2011 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/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_temp_dir.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/threading/thread.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
-#include "base/memory/scoped_temp_dir.h"
+#include "chrome/common/chrome_paths.h"
 #include "chrome/common/json_pref_store.h"
-#include "chrome/common/chrome_paths.h"
 #include "chrome/common/pref_names.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace {
+
+class MockPrefStoreObserver: public PrefStore::Observer {
+ public:
+  MOCK_METHOD1(OnPrefValueChanged, void (const std::string&));
+  MOCK_METHOD0(OnInitializationCompleted, void ());
+};
+
+}  // namespace
+
 class JsonPrefStoreTest : public testing::Test {
  protected:
   virtual void SetUp() {
     message_loop_proxy_ = base::MessageLoopProxy::CreateForCurrentThread();
 
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
 
     ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &data_dir_));
     data_dir_ = data_dir_.AppendASCII("pref_service");
     ASSERT_TRUE(file_util::PathExists(data_dir_));
@@ skipping 121 matching lines @@
 
   // Serialize and compare to expected output.
   FilePath output_file = input_file;
   FilePath golden_output_file = data_dir_.AppendASCII("write.golden.json");
   ASSERT_TRUE(file_util::PathExists(golden_output_file));
   ASSERT_TRUE(pref_store->WritePrefs());
   MessageLoop::current()->RunAllPending();
   EXPECT_TRUE(file_util::TextContentsEqual(golden_output_file, output_file));
   ASSERT_TRUE(file_util::Delete(output_file, false));
 }
+
+// Tests asynchronous reading of the file when there is no file.
+TEST_F(JsonPrefStoreTest, AsyncNonExistingFile) {
+  FilePath bogus_input_file = data_dir_.AppendASCII("read.txt");
+  ASSERT_FALSE(file_util::PathExists(bogus_input_file));
+  scoped_refptr<JsonPrefStore> pref_store =
+      new JsonPrefStore(bogus_input_file, message_loop_proxy_.get());
+  MockPrefStoreObserver mock_observer;
+  pref_store->AddObserver(&mock_observer);
+
+  PersistentPrefStore::PrefReadError error;
+  bool is_fatal;
+  pref_store->GetErrors(&error, &is_fatal);
+  EXPECT_EQ(PersistentPrefStore::PREF_READ_ERROR_NONE, error);
+  EXPECT_FALSE(is_fatal);
+
+  pref_store->ReadPrefsAsync();
+
+  EXPECT_CALL(mock_observer, OnInitializationCompleted()).Times(1);
+  message_loop_.RunAllPending();
+  pref_store->RemoveObserver(&mock_observer);
+
+  pref_store->GetErrors(&error, &is_fatal);
+
+  EXPECT_EQ(PersistentPrefStore::PREF_READ_ERROR_NO_FILE, error);
+  EXPECT_FALSE(is_fatal);
+  EXPECT_FALSE(pref_store->ReadOnly());
+}