Move ranker_model_loader to a new component.

components/translate/core/browser/ranker_model_unittest.cc

-// Copyright 2017 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/translate/core/browser/ranker_model.h"
-
-#include <memory>
-
-#include "base/memory/ptr_util.h"
-#include "base/time/time.h"
-#include "components/translate/core/browser/proto/ranker_model.pb.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace {
-
-using chrome_intelligence::RankerModel;
-
-const char kModelURL[] = "https://some.url.net/model";
-
-int64_t InSeconds(const base::Time t) {
-  return (t - base::Time()).InSeconds();
-}
-
-std::unique_ptr<RankerModel> NewModel(const std::string& model_url,
-                                      base::Time last_modified,
-                                      base::TimeDelta cache_duration) {
-  std::unique_ptr<RankerModel> model = base::MakeUnique<RankerModel>();
-  auto* metadata = model->mutable_proto()->mutable_metadata();
-  if (!model_url.empty())
-    metadata->set_source(model_url);
-  if (!last_modified.is_null())
-    metadata->set_last_modified_sec(InSeconds(last_modified));
-  if (!cache_duration.is_zero())
-    metadata->set_cache_duration_sec(cache_duration.InSeconds());
-
-  auto* translate = model->mutable_proto()->mutable_translate();
-  translate->set_version(1);
-
-  auto* logit = translate->mutable_logistic_regression_model();
-  logit->set_bias(0.1f);
-  logit->set_accept_ratio_weight(0.2f);
-  logit->set_decline_ratio_weight(0.3f);
-  logit->set_ignore_ratio_weight(0.4f);
-  return model;
-}
-
-}  // namespace
-
-TEST(RankerModelTest, Serialization) {
-  base::Time last_modified = base::Time::Now();
-  base::TimeDelta cache_duration = base::TimeDelta::FromDays(3);
-  std::unique_ptr<RankerModel> original_model =
-      NewModel(kModelURL, last_modified, cache_duration);
-  std::string original_model_str = original_model->SerializeAsString();
-  std::unique_ptr<RankerModel> serialized_model =
-      RankerModel::FromString(original_model_str);
-  std::string serialized_model_str = serialized_model->SerializeAsString();
-
-  EXPECT_EQ(serialized_model_str, original_model_str);
-  EXPECT_EQ(serialized_model->GetSourceURL(), kModelURL);
-  EXPECT_EQ(serialized_model->proto().metadata().last_modified_sec(),
-            InSeconds(last_modified));
-  EXPECT_EQ(serialized_model->proto().metadata().cache_duration_sec(),
-            cache_duration.InSeconds());
-}
-
-TEST(RankerModelTest, IsExpired) {
-  base::Time today = base::Time::Now();
-  base::TimeDelta days_15 = base::TimeDelta::FromDays(15);
-  base::TimeDelta days_30 = base::TimeDelta::FromDays(30);
-  base::TimeDelta days_60 = base::TimeDelta::FromDays(60);
-
-  EXPECT_FALSE(NewModel(kModelURL, today, days_30)->IsExpired());
-  EXPECT_FALSE(NewModel(kModelURL, today - days_15, days_30)->IsExpired());
-  EXPECT_TRUE(NewModel(kModelURL, today - days_60, days_30)->IsExpired());
-}