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