Changed previews component to be a layered component.

components/previews/previews_data_savings_unittest.cc

-// Copyright 2016 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 "components/previews/previews_data_savings.h"
-
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-
-#include "base/test/histogram_tester.h"
-#include "components/data_reduction_proxy/core/common/data_savings_recorder.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace previews {
-
-namespace {
-
-class TestDataSavingsRecorder
-    : public data_reduction_proxy::DataSavingsRecorder {
- public:
-  TestDataSavingsRecorder()
-      : data_saver_enabled_(false), data_used_(0), original_size_(0) {}
-  ~TestDataSavingsRecorder() {}
-
-  // data_reduction_proxy::DataSavingsRecorder implementation:
-  bool UpdateDataSavings(const std::string& host,
-                         int64_t data_used,
-                         int64_t original_size) override {
-    if (!data_saver_enabled_) {
-      return false;
-    }
-    last_host_ = host;
-    data_used_ += data_used;
-    original_size_ += original_size;
-    return true;
-  }
-
-  void set_data_saver_enabled(bool data_saver_enabled) {
-    data_saver_enabled_ = data_saver_enabled;
-  }
-
-  std::string last_host() const { return last_host_; }
-
-  int64_t data_used() const { return data_used_; }
-
-  int64_t original_size() const { return original_size_; }
-
- private:
-  bool data_saver_enabled_;
-  std::string last_host_;
-  int64_t data_used_;
-  int64_t original_size_;
-};
-
-}  // namespace
-
-class PreviewsDataSavingsTest : public testing::Test {
- public:
-  PreviewsDataSavingsTest()
-      : test_data_savings_recorder_(new TestDataSavingsRecorder()),
-        data_savings_(
-            new PreviewsDataSavings(test_data_savings_recorder_.get())) {}
-  ~PreviewsDataSavingsTest() override {}
-
-  PreviewsDataSavings* data_savings() const { return data_savings_.get(); }
-
-  TestDataSavingsRecorder* test_data_savings_recorder() const {
-    return test_data_savings_recorder_.get();
-  }
-
-  base::HistogramTester* histogram_tester() { return &histogram_tester_; }
-
- private:
-  base::HistogramTester histogram_tester_;
-
-  std::unique_ptr<TestDataSavingsRecorder> test_data_savings_recorder_;
-  std::unique_ptr<PreviewsDataSavings> data_savings_;
-};
-
-TEST_F(PreviewsDataSavingsTest, RecordDataSavings) {
-  int64_t original_size = 200;
-  int64_t data_used = 100;
-  std::string host = "host";
-
-  EXPECT_EQ(0, test_data_savings_recorder()->data_used());
-  EXPECT_EQ(0, test_data_savings_recorder()->original_size());
-  test_data_savings_recorder()->set_data_saver_enabled(false);
-  data_savings()->RecordDataSavings(host, data_used, original_size);
-
-  EXPECT_EQ(0, test_data_savings_recorder()->data_used());
-  EXPECT_EQ(0, test_data_savings_recorder()->original_size());
-  EXPECT_EQ(std::string(), test_data_savings_recorder()->last_host());
-
-  test_data_savings_recorder()->set_data_saver_enabled(true);
-  data_savings()->RecordDataSavings(host, data_used, original_size);
-
-  EXPECT_EQ(data_used, test_data_savings_recorder()->data_used());
-  EXPECT_EQ(original_size, test_data_savings_recorder()->original_size());
-  EXPECT_EQ(host, test_data_savings_recorder()->last_host());
-}
-
-TEST_F(PreviewsDataSavingsTest, RecordDataSavingsHistograms) {
-  int64_t twenty_kb = 20480;
-  int64_t twenty = twenty_kb >> 10;
-  int64_t ten_kb = 10240;
-  int64_t ten = ten_kb >> 10;
-  std::string host = "host";
-
-  test_data_savings_recorder()->set_data_saver_enabled(false);
-  data_savings()->RecordDataSavings(host, ten_kb, twenty_kb);
-
-  // The histograms record bytes in KB.
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.OriginalContentLength.DataSaverDisabled", twenty, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.ContentLength.DataSaverDisabled", ten, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataSavings.DataSaverDisabled", twenty - ten, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataSavingsPercent.DataSaverDisabled",
-      (twenty_kb - ten_kb) * 100 / twenty_kb, 1);
-
-  data_savings()->RecordDataSavings(host, twenty_kb, ten_kb);
-
-  // The histograms record bytes in KB.
-  histogram_tester()->ExpectBucketCount(
-      "Previews.OriginalContentLength.DataSaverDisabled", ten, 1);
-  histogram_tester()->ExpectBucketCount(
-      "Previews.ContentLength.DataSaverDisabled", twenty, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataInflation.DataSaverDisabled", twenty - ten, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataInflationPercent.DataSaverDisabled",
-      (twenty_kb - ten_kb) * 100 / twenty_kb, 1);
-
-  test_data_savings_recorder()->set_data_saver_enabled(true);
-  data_savings()->RecordDataSavings(host, ten_kb, twenty_kb);
-
-  // The histograms record bytes in KB.
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.OriginalContentLength.DataSaverEnabled", twenty, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.ContentLength.DataSaverEnabled", ten, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataSavings.DataSaverEnabled", twenty - ten, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataSavingsPercent.DataSaverEnabled",
-      (twenty_kb - ten_kb) * 100 / twenty_kb, 1);
-
-  data_savings()->RecordDataSavings(host, twenty_kb, ten_kb);
-
-  // The histograms record bytes in KB.
-  histogram_tester()->ExpectBucketCount(
-      "Previews.OriginalContentLength.DataSaverEnabled", ten, 1);
-  histogram_tester()->ExpectBucketCount(
-      "Previews.ContentLength.DataSaverEnabled", twenty, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataInflation.DataSaverEnabled", twenty - ten, 1);
-  histogram_tester()->ExpectUniqueSample(
-      "Previews.DataInflationPercent.DataSaverEnabled",
-      (twenty_kb - ten_kb) * 100 / twenty_kb, 1);
-}
-
-}  // namespace previews