Download driver for components/download.

components/download/content/download_driver_impl_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/download/content/download_driver_impl.h"
+
+#include <memory>
+#include <string>
+
+#include "base/memory/ptr_util.h"
+#include "content/public/test/fake_download_item.h"
+#include "content/public/test/mock_download_manager.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using testing::NiceMock;
+using testing::_;
+
+namespace download {
+
+namespace {
+
+const char kFakeGuid[] = "fake_guid";
+
+}  // namespace
+
+class MockDriverObserver : public DownloadDriver::Observer {
+ public:
+  MOCK_METHOD0(OnDriverReady, void());
+  MOCK_METHOD1(OnDownloadCreated, void(const std::string&));
+  MOCK_METHOD2(OnDownloadFailed, void(const std::string&, int));
+  MOCK_METHOD3(OnDownloadSucceeded,
+               void(const std::string&, const base::FilePath&, uint64_t));
+  MOCK_METHOD2(OnDownloadUpdated, void(const std::string&, uint64_t));
+};
+
+class DownloadDriverImplTest : public testing::Test {
+ public:
+  DownloadDriverImplTest() = default;
+  ~DownloadDriverImplTest() override = default;
+
+  void SetUp() override {
+    driver_ = base::MakeUnique<DownloadDriverImpl>(&mock_manager_);
+  }
+
+  // TODO(xingliu): implements test download manager for embedders to test.
+  NiceMock<content::MockDownloadManager> mock_manager_;
+  MockDriverObserver mock_observer_;
+  std::unique_ptr<DownloadDriverImpl> driver_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DownloadDriverImplTest);
+};
+
+// Ensures download updates from download items are propagated correctly.
+TEST_F(DownloadDriverImplTest, DownloadItemUpdateEvents) {

[David Trainor- moved to gerrit, 2017/05/15 20:08:15]

Can we test things like setup flow as well?

[xingliu, 2017/05/17 19:34:52]

Done.

+  using DownloadState = content::DownloadItem::DownloadState;
+  using DownloadInterruptReason = content::DownloadInterruptReason;
+
+  driver_->SetObserver(&mock_observer_);
+
+  content::FakeDownloadItem fake_item;
+  fake_item.SetState(DownloadState::IN_PROGRESS);
+  fake_item.SetGuid(kFakeGuid);
+  EXPECT_CALL(mock_observer_, OnDownloadUpdated(kFakeGuid, _))
+      .Times(1)
+      .RetiresOnSaturation();
+  static_cast<content::DownloadItem::Observer*>(driver_.get())
+      ->OnDownloadUpdated(&fake_item);
+
+  // Nothing happens for cancelled state.
+  fake_item.SetState(DownloadState::CANCELLED);
+  static_cast<content::DownloadItem::Observer*>(driver_.get())
+      ->OnDownloadUpdated(&fake_item);
+
+  fake_item.SetReceivedBytes(1024);
+  fake_item.SetState(DownloadState::COMPLETE);
+  EXPECT_CALL(mock_observer_,
+              OnDownloadSucceeded(kFakeGuid, _, fake_item.GetReceivedBytes()))
+      .Times(1)
+      .RetiresOnSaturation();
+  static_cast<content::DownloadItem::Observer*>(driver_.get())
+      ->OnDownloadUpdated(&fake_item);
+
+  fake_item.SetState(DownloadState::INTERRUPTED);
+  fake_item.SetLastReason(
+      DownloadInterruptReason::DOWNLOAD_INTERRUPT_REASON_SERVER_BAD_CONTENT);
+  EXPECT_CALL(
+      mock_observer_,
+      OnDownloadFailed(
+          kFakeGuid,
+          static_cast<int>(DownloadInterruptReason::
+                               DOWNLOAD_INTERRUPT_REASON_SERVER_BAD_CONTENT)))
+      .Times(1)
+      .RetiresOnSaturation();
+  static_cast<content::DownloadItem::Observer*>(driver_.get())
+      ->OnDownloadUpdated(&fake_item);
+
+  // Nothing happens if observer is dettached.
+  driver_->SetObserver(nullptr);
+  static_cast<content::DownloadItem::Observer*>(driver_.get())
+      ->OnDownloadUpdated(&fake_item);
+}
+
+}  // namespace download