Add an experiment for the default browser infobar on Windows 10

chrome/browser/ui/startup/default_browser_infobar_delegate_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 "chrome/browser/ui/startup/default_browser_infobar_delegate.h"
+
+#include <memory>
+#include <string>
+
+#include "base/feature_list.h"
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/run_loop.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/test/base/testing_profile.h"
+#include "components/infobars/core/infobar.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "content/public/test/test_web_contents_factory.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chrome {
+
+// An implementation of DefaultBrowserWorker that will simply invoke the
+// 'on_finished_callback' immediately.
+class FakeDefaultBrowserWorker
+    : public shell_integration::DefaultBrowserWorker {
+ public:
+  FakeDefaultBrowserWorker(
+      const shell_integration::DefaultWebClientWorkerCallback& callback)
+      : shell_integration::DefaultBrowserWorker(callback) {}
+
+ private:
+  ~FakeDefaultBrowserWorker() override = default;
+
+  shell_integration::DefaultWebClientState CheckIsDefaultImpl() override {
+    return shell_integration::NOT_DEFAULT;
+  }
+
+  void SetAsDefaultImpl(const base::Closure& on_finished_callback) override {
+    on_finished_callback.Run();
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(FakeDefaultBrowserWorker);
+};
+
+class FakeDefaultBrowserInfoBarDelegate : public DefaultBrowserInfoBarDelegate {
+ public:
+  FakeDefaultBrowserInfoBarDelegate()
+      : DefaultBrowserInfoBarDelegate(nullptr) {}
+
+ private:
+  scoped_refptr<shell_integration::DefaultBrowserWorker>
+  CreateDefaultBrowserWorker(
+      const shell_integration::DefaultWebClientWorkerCallback& callback)
+      override {
+    return new FakeDefaultBrowserWorker(callback);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(FakeDefaultBrowserInfoBarDelegate);
+};
+
+class DefaultBrowserInfoBarDelegateTest : public ::testing::Test {
+ public:
+  DefaultBrowserInfoBarDelegateTest()
+      : profile_(new TestingProfile()),
+        web_contents_(factory_.CreateWebContents(profile_.get())) {
+    InfoBarService::CreateForWebContents(web_contents_);
+    infobar_service_ = InfoBarService::FromWebContents(web_contents_);
+  }
+
+ protected:
+  void EnableStickyDefaultBrowserPrompt() {
+    base::FeatureList::ClearInstanceForTesting();
+    std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
+    feature_list->InitializeFromCommandLine(kStickyDefaultBrowserPrompt.name,
+                                            std::string());
+    base::FeatureList::SetInstance(std::move(feature_list));
+  }
+
+  void AddDefaultBrowserInfoBar() {
+    infobar_service_->AddInfoBar(infobar_service_->CreateConfirmInfoBar(
+        base::WrapUnique(new FakeDefaultBrowserInfoBarDelegate())));
+  }
+
+  InfoBarService* infobar_service() { return infobar_service_; }
+
+ private:
+  // The DefaultBrowserWorker requires a FILE thread. Also provides a
+  // SingleThreadTaskRunner for the test profile and the default browser prompt.
+  content::TestBrowserThreadBundle thread_bundle;
+
+  // Required to get an InfoBarService.
+  std::unique_ptr<TestingProfile> profile_;
+  content::TestWebContentsFactory factory_;
+  content::WebContents* web_contents_;
+
+  // Manages the default browser prompt.
+  InfoBarService* infobar_service_;
+
+  DISALLOW_COPY_AND_ASSIGN(DefaultBrowserInfoBarDelegateTest);
+};
+
+TEST_F(DefaultBrowserInfoBarDelegateTest, DefaultBehavior) {
+  AddDefaultBrowserInfoBar();
+  ASSERT_EQ(1U, infobar_service()->infobar_count());
+
+  infobars::InfoBar* default_browser_infobar = infobar_service()->infobar_at(0);
+  ConfirmInfoBarDelegate* default_browser_infobar_delegate =
+      default_browser_infobar->delegate()->AsConfirmInfoBarDelegate();
+
+  // When the sticky default browser prompt experiment is not enabled, the
+  // infobar delegate should allow itself to be destroyed immediately if the
+  // user activates the default action. Accept() should return true to indicate
+  // this.
+  EXPECT_TRUE(default_browser_infobar_delegate->Accept());
+}
+
+#if defined(OS_WIN)
+TEST_F(DefaultBrowserInfoBarDelegateTest, StickyDefaultBrowserPrompt) {
+  EnableStickyDefaultBrowserPrompt();
+
+  // For most Windows versions, this experiment is disabled.
+  if (!IsStickyDefaultBrowserPromptEnabled())
+    return;
+
+  AddDefaultBrowserInfoBar();
+  ASSERT_EQ(1U, infobar_service()->infobar_count());
+
+  infobars::InfoBar* default_browser_infobar = infobar_service()->infobar_at(0);
+  ConfirmInfoBarDelegate* default_browser_infobar_delegate =
+      default_browser_infobar->delegate()->AsConfirmInfoBarDelegate();
+
+  // The sticky default browser prompt experiment should mean activating the
+  // infobar's default action does not result in the infobar's destruction.
+  // Instead, the infobar will ultimately be destroyed when the
+  // DefaultBrowserWorker is done. To indicate this Accept() should return
+  // false.
+  EXPECT_FALSE(default_browser_infobar_delegate->Accept());
+  EXPECT_EQ(1U, infobar_service()->infobar_count());
+
+  // Spin the message loop to allow the FakeDefaultBrowserWorker to complete,
+  // which should destroy the infobar.
+  base::RunLoop().RunUntilIdle();
+  EXPECT_EQ(0U, infobar_service()->infobar_count());
+}
+#endif  // defined(OS_WIN)
+
+}  // namespace chrome