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- // Copyright 2018 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/metrics/persistent_histogram_storage.h"
- #include <memory>
- #include "base/files/file_path.h"
- #include "base/files/file_util.h"
- #include "base/files/scoped_temp_dir.h"
- #include "base/metrics/histogram_macros.h"
- #include "base/metrics/persistent_histogram_allocator.h"
- #include "base/time/time.h"
- #include "build/build_config.h"
- #include "testing/gtest/include/gtest/gtest.h"
- namespace base {
- namespace {
- // Name of the allocator for storing histograms.
- constexpr char kTestHistogramAllocatorName[] = "TestMetrics";
- } // namespace
- class PersistentHistogramStorageTest : public testing::Test {
- public:
- PersistentHistogramStorageTest(const PersistentHistogramStorageTest&) =
- delete;
- PersistentHistogramStorageTest& operator=(
- const PersistentHistogramStorageTest&) = delete;
- protected:
- PersistentHistogramStorageTest() = default;
- ~PersistentHistogramStorageTest() override = default;
- // Creates a unique temporary directory, and sets the test storage directory.
- void SetUp() override {
- ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
- test_storage_dir_ =
- temp_dir_path().AppendASCII(kTestHistogramAllocatorName);
- }
- // Gets the path to the temporary directory.
- const FilePath& temp_dir_path() { return temp_dir_.GetPath(); }
- const FilePath& test_storage_dir() { return test_storage_dir_; }
- private:
- // A temporary directory where all file IO operations take place.
- ScopedTempDir temp_dir_;
- // The directory into which metrics files are written.
- FilePath test_storage_dir_;
- };
- #if !BUILDFLAG(IS_NACL)
- TEST_F(PersistentHistogramStorageTest, HistogramWriteTest) {
- auto persistent_histogram_storage =
- std::make_unique<PersistentHistogramStorage>(
- kTestHistogramAllocatorName,
- PersistentHistogramStorage::StorageDirManagement::kCreate);
- persistent_histogram_storage->set_storage_base_dir(temp_dir_path());
- // Log some random data.
- UMA_HISTOGRAM_BOOLEAN("Some.Test.Metric", true);
- // Deleting the object causes the data to be written to the disk.
- persistent_histogram_storage.reset();
- // The storage directory and the histogram file are created during the
- // destruction of the PersistentHistogramStorage instance.
- EXPECT_TRUE(DirectoryExists(test_storage_dir()));
- EXPECT_FALSE(IsDirectoryEmpty(test_storage_dir()));
- // Clean up for subsequent tests.
- GlobalHistogramAllocator::ReleaseForTesting();
- }
- #endif // !BUILDFLAG(IS_NACL)
- } // namespace base
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