WebUI: Update Downloads to fix bug introduced by JS lifecycle controls.

chrome/browser/ui/webui/md_downloads/md_downloads_dom_handler_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/webui/md_downloads/md_downloads_dom_handler.h"
 
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/mock_download_manager.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "content/public/test/test_web_ui.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-TEST(MdDownloadsDOMHandlerTest, ChecksForRemovedFiles) {
-  content::TestBrowserThreadBundle thread_bundle;
-  TestingProfile profile;
+namespace {
 
-  testing::NiceMock<content::MockDownloadManager> manager;
-  ON_CALL(manager, GetBrowserContext()).WillByDefault(
-      testing::Return(&profile));
+class TestMdDownloadsDOMHandler : public MdDownloadsDOMHandler {
+ public:
+  explicit TestMdDownloadsDOMHandler(content::DownloadManager* download_manager,
+                                     content::WebUI* web_ui)
+      : MdDownloadsDOMHandler(download_manager, web_ui) {}
 
-  content::TestWebUI web_ui;
+  using MdDownloadsDOMHandler::set_web_ui;
+};
 
-  EXPECT_CALL(manager, CheckForHistoryFilesRemoval());
-  MdDownloadsDOMHandler handler(&manager, &web_ui);
+}  // namespace
 
-  testing::Mock::VerifyAndClear(&manager);
+// A fixture to test MdDownloadsDOMHandler.
+class MdDownloadsDOMHandlerTest : public testing::Test {
+ public:
+  // testing::Test:
+  void SetUp() override {
+    ON_CALL(manager_, GetBrowserContext())
+        .WillByDefault(testing::Return(&profile_));
+  }
 
-  EXPECT_CALL(manager, CheckForHistoryFilesRemoval());
+  TestingProfile* profile() { return &profile_; }
+  content::MockDownloadManager* manager() { return &manager_; }
+  content::TestWebUI* web_ui() { return &web_ui_; }
+
+ private:
+  // NOTE: The initialization order of these members matters.
+  content::TestBrowserThreadBundle thread_bundle_;
+  TestingProfile profile_;
+
+  testing::NiceMock<content::MockDownloadManager> manager_;
+  content::TestWebUI web_ui_;
+};
+
+TEST_F(MdDownloadsDOMHandlerTest, ChecksForRemovedFiles) {
+  EXPECT_CALL(*manager(), CheckForHistoryFilesRemoval());
+  TestMdDownloadsDOMHandler handler(manager(), web_ui());
+
+  testing::Mock::VerifyAndClear(manager());
+
+  EXPECT_CALL(*manager(), CheckForHistoryFilesRemoval());
   handler.OnJavascriptDisallowed();
 }
+
+TEST_F(MdDownloadsDOMHandlerTest, HandleGetDownloads) {
+  TestMdDownloadsDOMHandler handler(manager(), web_ui());
+  handler.set_web_ui(web_ui());

[Dan Beam, 2016/05/03 04:11:38]

why do you need to call set_web_ui here?

[tommycli, 2016/05/03 16:26:05]

We must call it here because the web_ui passed in during construction is only
forwarded to the ListTracker. The web_ui() member is nullptr until we call
set_web_ui.

+
+  base::ListValue empty_search_terms;
+  handler.HandleGetDownloads(&empty_search_terms);
+
+  EXPECT_EQ(1U, web_ui()->call_data().size());
+  EXPECT_EQ("downloads.Manager.insertItems",
+            web_ui()->call_data()[0]->function_name());
+}