// Copyright (c) 2014 The Chromium OS 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 <memory>

#include <gtest/gtest.h>

#include <base/compiler_specific.h>
#include <base/files/file_enumerator.h>
#include <base/files/file_util.h>

#include "metrics/persistent_integer.h"

const char kBackingFileName[] = "1.pibakf";
const char kBackingFilePattern[] = "*.pibakf";

using chromeos_metrics::PersistentInteger;

class PersistentIntegerTest : public testing::Test {
  void SetUp() override {
    // Set testing mode.
    chromeos_metrics::PersistentInteger::SetTestingMode(true);
  }

  void TearDown() override {
    // Remove backing files.  The convention is that they all end in ".pibakf".
    base::FileEnumerator f_enum(base::FilePath("."),
                                false,
                                base::FileEnumerator::FILES,
                                FILE_PATH_LITERAL(kBackingFilePattern));
    for (base::FilePath name = f_enum.Next(); !name.empty();
         name = f_enum.Next()) {
      base::DeleteFile(name, false);
    }
  }
};

TEST_F(PersistentIntegerTest, BasicChecks) {
  std::unique_ptr<PersistentInteger> pi(
      new PersistentInteger(kBackingFileName));

  // Test initialization.
  EXPECT_EQ(0, pi->Get());
  EXPECT_EQ(kBackingFileName, pi->Name());  // boring

  // Test set and add.
  pi->Set(2);
  pi->Add(3);
  EXPECT_EQ(5, pi->Get());

  // Test persistence.
  pi.reset(new PersistentInteger(kBackingFileName));
  EXPECT_EQ(5, pi->Get());

  // Test GetAndClear.
  EXPECT_EQ(5, pi->GetAndClear());
  EXPECT_EQ(pi->Get(), 0);

  // Another persistence test.
  pi.reset(new PersistentInteger(kBackingFileName));
  EXPECT_EQ(0, pi->Get());
}

int main(int argc, char** argv) {
  testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}