Adding a new component, Previews.

components/previews/previews_experiments_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_experiments.h"
+
+#include <map>
+#include <string>
+
+#include "base/metrics/field_trial.h"
+#include "components/variations/variations_associated_data.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+using PreviewsExperimentsTest = testing::Test;
+
+}  // namespace
+
+namespace previews {
+
+TEST_F(PreviewsExperimentsTest, TestFieldTrialOfflinePage) {
+  EXPECT_FALSE(IsIncludedInClientSidePreviewsExperimentsFieldTrial());
+  EXPECT_FALSE(IsOfflinePreviewsEnabled());
+
+  std::map<std::string, std::string> params;
+  params["show_offline_pages"] = "true";
+  ASSERT_TRUE(variations::AssociateVariationParams("ClientSidePreviews",
+                                                   "Enabled", params));
+  base::FieldTrialList field_trial_list(nullptr);
+  ASSERT_TRUE(
+      base::FieldTrialList::CreateFieldTrial("ClientSidePreviews", "Enabled"));
+
+  EXPECT_TRUE(IsIncludedInClientSidePreviewsExperimentsFieldTrial());
+  EXPECT_TRUE(IsOfflinePreviewsEnabled());
+}
+
+}  // namespace previews