Add a function for usage tracking. It's based on the bug 6426001.

BUG=
TEST=

Review URL: http://codereview.chromium.org/6453001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@76578 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 145 insertions, 0 deletions

diff --git a/webkit/fileapi/file_system_usage_cache_unittest.cc b/webkit/fileapi/file_system_usage_cache_unittest.cc
new file mode 100644
index 0000000..f74bdbb
--- /dev/null
+++ b/webkit/fileapi/file_system_usage_cache_unittest.cc
@@ -0,0 +1,145 @@
+// 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 "webkit/fileapi/file_system_usage_cache.h"
+
+#include "base/basictypes.h"
+#include "base/file_util.h"
+#include "base/scoped_temp_dir.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using namespace fileapi;
+
+class FileSystemUsageCacheTest : public testing::Test {
+ public:
+  FileSystemUsageCacheTest() {}
+
+  void SetUp() {
+    ASSERT_TRUE(data_dir_.CreateUniqueTempDir());
+  }
+
+protected:
+  FilePath GetUsageFilePath() {
+    return data_dir_.path().AppendASCII(FileSystemUsageCache::kUsageFileName);
+  }
+
+ private:
+  ScopedTempDir data_dir_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileSystemUsageCacheTest);
+};
+
+TEST_F(FileSystemUsageCacheTest, CreateTest) {
+  FilePath usage_file_path = GetUsageFilePath();
+  EXPECT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, 0));
+}
+
+TEST_F(FileSystemUsageCacheTest, SetSizeTest) {
+  static const int64 size = 240122;
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, size));
+  EXPECT_EQ(size, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, SetLargeSizeTest) {
+  static const int64 size = kint64max;
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, size));
+  EXPECT_EQ(size, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, IncAndGetSizeTest) {
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, 98214));
+  ASSERT_EQ(true,
+            FileSystemUsageCache::IncrementDirty(usage_file_path));
+  EXPECT_EQ(-1, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, DecAndGetSizeTest) {
+  static const int64 size = 71839;
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, size));
+  // DecrementDirty for dirty = 0 is invalid. It returns false.
+  ASSERT_EQ(false,
+            FileSystemUsageCache::DecrementDirty(usage_file_path));
+  EXPECT_EQ(size, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, IncDecAndGetSizeTest) {
+  static const int64 size = 198491;
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, size));
+  ASSERT_EQ(true,
+            FileSystemUsageCache::IncrementDirty(usage_file_path));
+  ASSERT_EQ(true,
+            FileSystemUsageCache::DecrementDirty(usage_file_path));
+  EXPECT_EQ(size, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, DecIncAndGetSizeTest) {
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, 854238));
+  // DecrementDirty for dirty = 0 is invalid. It returns false.
+  ASSERT_EQ(false,
+            FileSystemUsageCache::DecrementDirty(usage_file_path));
+  ASSERT_EQ(true,
+            FileSystemUsageCache::IncrementDirty(usage_file_path));
+  // It tests DecrementDirty (which returns false) has no effect, i.e
+  // does not make dirty = -1 after DecrementDirty.
+  EXPECT_EQ(-1, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, ManyIncsSameDecsAndGetSizeTest) {
+  static const int64 size = 82412;
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, size));
+  for (int i = 0; i < 20; i++) {
+    ASSERT_EQ(true,
+              FileSystemUsageCache::IncrementDirty(usage_file_path));
+  }
+  for (int i = 0; i < 20; i++) {
+    ASSERT_EQ(true,
+              FileSystemUsageCache::DecrementDirty(usage_file_path));
+  }
+  EXPECT_EQ(size, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, ManyIncsLessDecsAndGetSizeTest) {
+  FilePath usage_file_path = GetUsageFilePath();
+  ASSERT_EQ(FileSystemUsageCache::kUsageFileSize,
+            FileSystemUsageCache::UpdateUsage(usage_file_path, 19319));
+  for (int i = 0; i < 20; i++) {
+    ASSERT_EQ(true,
+              FileSystemUsageCache::IncrementDirty(usage_file_path));
+  }
+  for (int i = 0; i < 19; i++) {
+    ASSERT_EQ(true,
+              FileSystemUsageCache::DecrementDirty(usage_file_path));
+  }
+  EXPECT_EQ(-1, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, GetSizeWithoutCacheFileTest) {
+  FilePath usage_file_path = GetUsageFilePath();
+  EXPECT_EQ(-1, FileSystemUsageCache::GetUsage(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, IncrementDirtyWithoutCacheFileTest) {
+  FilePath usage_file_path = GetUsageFilePath();
+  EXPECT_EQ(false, FileSystemUsageCache::IncrementDirty(usage_file_path));
+}
+
+TEST_F(FileSystemUsageCacheTest, DecrementDirtyWithoutCacheFileTest) {
+  FilePath usage_file_path = GetUsageFilePath();
+  EXPECT_EQ(false, FileSystemUsageCache::IncrementDirty(usage_file_path));
+}