base/files/important_file_writer_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/files/important_file_writer.h"
   6
   7 #include "base/compiler_specific.h"
   8 #include "base/file_path.h"
   9 #include "base/file_util.h"
  10 #include "base/logging.h"
  11 #include "base/message_loop.h"
  12 #include "base/scoped_temp_dir.h"
  13 #include "base/threading/thread.h"
  14 #include "base/time.h"
  15 #include "testing/gtest/include/gtest/gtest.h"
  16
  17 namespace base {
  18
  19 namespace {
  20
  21 std::string GetFileContent(const FilePath& path) {
  22   std::string content;
  23   if (!file_util::ReadFileToString(path, &content)) {
  24     NOTREACHED();
  25   }
  26   return content;
  27 }
  28
  29 class DataSerializer : public ImportantFileWriter::DataSerializer {
  30  public:
  31   explicit DataSerializer(const std::string& data) : data_(data) {
  32   }
  33
  34   virtual bool SerializeData(std::string* output) {
  35     output->assign(data_);
  36     return true;
  37   }
  38
  39  private:
  40   const std::string data_;
  41 };
  42
  43 }  // namespace
  44
  45 class ImportantFileWriterTest : public testing::Test {
  46  public:
  47   ImportantFileWriterTest() { }
  48   virtual void SetUp() {
  49     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
  50     file_ = temp_dir_.path().AppendASCII("test-file");
  51   }
  52
  53  protected:
  54   FilePath file_;
  55   MessageLoop loop_;
  56
  57  private:
  58   ScopedTempDir temp_dir_;
  59 };
  60
  61 TEST_F(ImportantFileWriterTest, Basic) {
  62   ImportantFileWriter writer(file_,
  63                              MessageLoopProxy::current());
  64   EXPECT_FALSE(file_util::PathExists(writer.path()));
  65   writer.WriteNow("foo");
  66   loop_.RunUntilIdle();
  67
  68   ASSERT_TRUE(file_util::PathExists(writer.path()));
  69   EXPECT_EQ("foo", GetFileContent(writer.path()));
  70 }
  71
  72 TEST_F(ImportantFileWriterTest, ScheduleWrite) {
  73   ImportantFileWriter writer(file_,
  74                              MessageLoopProxy::current());
  75   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
  76   EXPECT_FALSE(writer.HasPendingWrite());
  77   DataSerializer serializer("foo");
  78   writer.ScheduleWrite(&serializer);
  79   EXPECT_TRUE(writer.HasPendingWrite());
  80   MessageLoop::current()->PostDelayedTask(
  81       FROM_HERE,
  82       MessageLoop::QuitClosure(),
  83       TimeDelta::FromMilliseconds(100));
  84   MessageLoop::current()->Run();
  85   EXPECT_FALSE(writer.HasPendingWrite());
  86   ASSERT_TRUE(file_util::PathExists(writer.path()));
  87   EXPECT_EQ("foo", GetFileContent(writer.path()));
  88 }
  89
  90 TEST_F(ImportantFileWriterTest, DoScheduledWrite) {
  91   ImportantFileWriter writer(file_,
  92                              MessageLoopProxy::current());
  93   EXPECT_FALSE(writer.HasPendingWrite());
  94   DataSerializer serializer("foo");
  95   writer.ScheduleWrite(&serializer);
  96   EXPECT_TRUE(writer.HasPendingWrite());
  97   writer.DoScheduledWrite();
  98   MessageLoop::current()->PostDelayedTask(
  99       FROM_HERE,
 100       MessageLoop::QuitClosure(),
 101       TimeDelta::FromMilliseconds(100));
 102   MessageLoop::current()->Run();
 103   EXPECT_FALSE(writer.HasPendingWrite());
 104   ASSERT_TRUE(file_util::PathExists(writer.path()));
 105   EXPECT_EQ("foo", GetFileContent(writer.path()));
 106 }
 107
 108 TEST_F(ImportantFileWriterTest, BatchingWrites) {
 109   ImportantFileWriter writer(file_,
 110                              MessageLoopProxy::current());
 111   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
 112   DataSerializer foo("foo"), bar("bar"), baz("baz");
 113   writer.ScheduleWrite(&foo);
 114   writer.ScheduleWrite(&bar);
 115   writer.ScheduleWrite(&baz);
 116   MessageLoop::current()->PostDelayedTask(
 117       FROM_HERE,
 118       MessageLoop::QuitClosure(),
 119       TimeDelta::FromMilliseconds(100));
 120   MessageLoop::current()->Run();
 121   ASSERT_TRUE(file_util::PathExists(writer.path()));
 122   EXPECT_EQ("baz", GetFileContent(writer.path()));
 123 }
 124
 125 }  // namespace base