Move download filename determintion into a separate class.

chrome/browser/download/download_target_determiner_unittest.cc

+// Copyright (c) 2012 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 "base/file_util.h"
+#include "base/files/file_path.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/message_loop.h"
+#include "base/observer_list.h"
+#include "base/prefs/pref_service.h"
+#include "base/stl_util.h"
+#include "base/string_util.h"
+#include "base/value_conversions.h"
+#include "chrome/browser/download/chrome_download_manager_delegate.h"
+#include "chrome/browser/download/download_extensions.h"
+#include "chrome/browser/download/download_prefs.h"
+#include "chrome/browser/download/download_target_determiner.h"
+#include "chrome/browser/download/download_util.h"
+#include "chrome/browser/history/history_service.h"
+#include "chrome/browser/history/history_service_factory.h"
+#include "chrome/browser/history/history_types.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/test/base/chrome_render_view_host_test_harness.h"
+#include "chrome/test/base/testing_pref_service_syncable.h"
+#include "chrome/test/base/testing_profile.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+#include "content/public/test/mock_download_item.h"
+#include "content/public/test/test_browser_thread.h"
+#include "content/public/test/test_renderer_host.h"
+#include "content/public/test/web_contents_tester.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::AnyNumber;
+using ::testing::Invoke;
+using ::testing::Ref;
+using ::testing::Return;
+using ::testing::ReturnRef;
+using ::testing::ReturnRefOfCopy;
+using ::testing::Truly;
+using ::testing::WithArg;
+using ::testing::_;
+using content::DownloadItem;
+
+namespace {
+
+// No-op delegate.
+class NullWebContentsDelegate : public content::WebContentsDelegate {
+ public:
+  NullWebContentsDelegate() {}
+  ~NullWebContentsDelegate() {}
+};
+
+// Google Mock action that posts a task to the current message loop that invokes
+// the first argument of the mocked method as a callback. Said argument must be
+// a base::Callback<void(ParamType)>. |result| must be of |ParamType| and is
+// bound as that parameter.
+// Example:
+//   class FooClass {
+//    public:
+//     virtual void Foo(base::Callback<void(bool)> callback);
+//   };
+//   ...
+//   EXPECT_CALL(mock_fooclass_instance, Foo(callback))
+//     .WillOnce(ScheduleCallback(false));
+ACTION_P(ScheduleCallback, result0) {
+  MessageLoop::current()->PostTask(FROM_HERE, base::Bind(arg0, result0));
+}
+
+// Similar to ScheduleCallback, but binds 2 arguments.
+ACTION_P2(ScheduleCallback2, result0, result1) {
+  MessageLoop::current()->PostTask(
+      FROM_HERE, base::Bind(arg0, result0, result1));
+}
+
+// Used with DownloadTestCase. Indicates the type of test case. The expectations
+// for the test is set based on the type.
+enum TestCaseType {
+  SAVE_AS,
+  AUTOMATIC,
+  FORCED  // Requires that forced_file_path be non-empty.
+};
+
+// Used with DownloadTestCase. Type of intermediate filename to expect.
+enum TestCaseExpectIntermediate {
+  EXPECT_CRDOWNLOAD,  // Expect path/to/target.crdownload.
+  EXPECT_UNCONFIRMED, // Expect path/to/Unconfirmed xxx.crdownload.
+  EXPECT_LOCAL_PATH,  // Expect target path.
+};
+
+// Typical download test case. Used with
+// DownloadTargetDeterminerTest::RunTestCase().
+struct DownloadTestCase {
+  // Type of test.
+  TestCaseType test_type;
+
+  // Expected danger type. Verified at the end of target determination.
+  content::DownloadDangerType expected_danger_type;
+
+  // Value of DownloadItem::GetURL()
+  const char* url;
+
+  // Value of DownloadItem::GetMimeType()
+  const char* mime_type;
+
+  // Should be non-empty if |test_type| == FORCED. Value of GetForcedFilePath().
+  const base::FilePath::CharType* forced_file_path;
+
+  // Expected virtual path. Specified relative to the virtual download path. If
+  // empty, assumed to be the same as |expected_local_path|.
+  const base::FilePath::CharType* expected_virtual_path;
+
+  // Expected local path. Specified relative to the test download path.
+  const base::FilePath::CharType* expected_local_path;
+
+  // Expected target disposition. If this is TARGET_DISPOSITION_PROMPT, then the
+  // test run will expect ChromeDownloadManagerDelegate to prompt the user for a
+  // download location.
+  DownloadItem::TargetDisposition expected_disposition;
+
+  // Type of intermediate path to expect.
+  TestCaseExpectIntermediate expected_intermediate;
+};
+
+class MockDownloadTargetDeterminerDelegate :
+      public DownloadTargetDeterminerDelegate {
+ public:
+  MOCK_METHOD3(CheckDownloadUrl,
+               void(content::DownloadItem*, const base::FilePath&,
+                    const CheckDownloadUrlCallback&));
+  MOCK_METHOD3(NotifyExtensions,
+               void(content::DownloadItem*, const base::FilePath&,
+                    const NotifyExtensionsCallback&));
+  MOCK_METHOD3(PromptUserForDownloadPath,
+               void(content::DownloadItem*, const base::FilePath&,
+                    const FileSelectedCallback&));
+  MOCK_METHOD3(DetermineLocalPath,
+               void(DownloadItem*, const base::FilePath&,
+                    const LocalPathCallback&));
+  MOCK_METHOD4(ReserveVirtualPath,
+               void(DownloadItem*, const base::FilePath&,
+                    DownloadPathReservationTracker::FilenameConflictAction,
+                    const ReservedPathCallback&));
+
+  void SetupDefaults() {
+    ON_CALL(*this, CheckDownloadUrl(_, _, _))
+        .WillByDefault(WithArg<2>(
+            ScheduleCallback(content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS)));
+    ON_CALL(*this, NotifyExtensions(_, _, _))
+        .WillByDefault(WithArg<2>(
+            ScheduleCallback2(base::FilePath(),
+                              DownloadPathReservationTracker::UNIQUIFY)));
+    ON_CALL(*this, ReserveVirtualPath(_, _, _, _))
+        .WillByDefault(Invoke(
+            &MockDownloadTargetDeterminerDelegate::NullReserveVirtualPath));
+    ON_CALL(*this, PromptUserForDownloadPath(_, _, _))
+        .WillByDefault(Invoke(
+            &MockDownloadTargetDeterminerDelegate::NullPromptUser));
+    ON_CALL(*this, DetermineLocalPath(_, _, _))
+        .WillByDefault(Invoke(
+            &MockDownloadTargetDeterminerDelegate::NullDetermineLocalPath));
+  }
+ private:
+  static void NullReserveVirtualPath(
+      DownloadItem* download,
+      const base::FilePath& virtual_path,
+      DownloadPathReservationTracker::FilenameConflictAction conflict_action,
+      const DownloadTargetDeterminerDelegate::ReservedPathCallback& callback);
+  static void NullPromptUser(
+      DownloadItem* download, const base::FilePath& suggested_path,
+      const FileSelectedCallback& callback);
+  static void NullDetermineLocalPath(
+      DownloadItem* download, const base::FilePath& virtual_path,
+      const LocalPathCallback& callback);
+};
+
+class DownloadTargetDeterminerTest : public ChromeRenderViewHostTestHarness {
+ public:
+  DownloadTargetDeterminerTest();
+
+  // ::testing::Test
+  virtual void SetUp() OVERRIDE;
+  virtual void TearDown() OVERRIDE;
+
+  // Creates MockDownloadItem and sets up default expectations.
+  content::MockDownloadItem* CreateActiveDownloadItem(
+      int32 id,
+      const DownloadTestCase& test_case);
+
+  // Sets the AutoOpenBasedOnExtension user preference for |path|.
+  void EnableAutoOpenBasedOnExtension(const base::FilePath& path);
+
+  // Set the kDownloadDefaultDirectory user preference to |path|.
+  void SetDefaultDownloadPath(const base::FilePath& path);
+
+  // Set the kDownloadDefaultDirectory managed preference to |path|.
+  void SetManagedDownloadPath(const base::FilePath& path);
+
+  // Set the kPromptForDownload user preference to |prompt|.
+  void SetPromptForDownload(bool prompt);
+
+  // Given the relative path |path|, returns the full path under the temporary
+  // downloads directory.
+  base::FilePath GetPathInDownloadDir(const base::FilePath::StringType& path);
+
+  // Run |test_case| using |item|.
+  void RunTestCase(const DownloadTestCase& test_case,
+                   content::MockDownloadItem* item);
+
+  // Run through |test_case_count| tests in |test_cases|. A new MockDownloadItem
+  // will be created for each test case and destroyed when the test case is
+  // complete.
+  void RunTestCasesWithActiveItem(const DownloadTestCase test_cases[],
+                                  size_t test_case_count);
+
+  const base::FilePath& test_download_dir() const {
+    return test_download_dir_.path();
+  }
+
+  const base::FilePath& test_virtual_dir() const {
+    return test_virtual_dir_;
+  }
+
+  MockDownloadTargetDeterminerDelegate* delegate() {
+    return &delegate_;
+  }
+
+  DownloadPrefs* download_prefs() {
+    return download_prefs_.get();
+  }
+
+  void set_last_selected_directory(const base::FilePath& path) {
+    last_selected_directory_ = path;
+  }
+
+ private:
+  // Verifies that |target_path|, |disposition|, |expected_danger_type| and
+  // |intermediate_path| matches the expectations of |test_case|.
+  void DownloadTargetVerifier(const DownloadTestCase& test_case,
+                              const base::FilePath& local_path,
+                              DownloadItem::TargetDisposition disposition,
+                              content::DownloadDangerType danger_type,
+                              const base::FilePath& intermediate_path);
+
+  scoped_ptr<DownloadPrefs> download_prefs_;
+  ::testing::NiceMock<MockDownloadTargetDeterminerDelegate> delegate_;
+  NullWebContentsDelegate web_contents_delegate_;
+  base::ScopedTempDir test_download_dir_;
+  base::FilePath test_virtual_dir_;
+  base::FilePath last_selected_directory_;
+  content::TestBrowserThread ui_thread_;
+  content::TestBrowserThread file_thread_;
+};
+
+DownloadTargetDeterminerTest::DownloadTargetDeterminerTest()
+    : ChromeRenderViewHostTestHarness(),
+      ui_thread_(content::BrowserThread::UI, &message_loop_),
+      file_thread_(content::BrowserThread::FILE, &message_loop_) {
+}
+
+void DownloadTargetDeterminerTest::SetUp() {
+  ChromeRenderViewHostTestHarness::SetUp();
+  CHECK(profile());
+  download_prefs_.reset(new DownloadPrefs(profile()));
+  web_contents()->SetDelegate(&web_contents_delegate_);
+  ASSERT_TRUE(test_download_dir_.CreateUniqueTempDir());
+  test_virtual_dir_ = test_download_dir().Append(FILE_PATH_LITERAL("virtual"));
+  SetDefaultDownloadPath(test_download_dir());
+  delegate_.SetupDefaults();
+}
+
+void DownloadTargetDeterminerTest::TearDown() {
+  download_prefs_.reset();
+  message_loop_.RunUntilIdle();
+  ChromeRenderViewHostTestHarness::TearDown();
+}
+
+content::MockDownloadItem*
+DownloadTargetDeterminerTest::CreateActiveDownloadItem(
+    int32 id,
+    const DownloadTestCase& test_case) {
+  content::MockDownloadItem* item =
+      new ::testing::NiceMock<content::MockDownloadItem>();
+  GURL download_url(test_case.url);
+  std::vector<GURL> url_chain;
+  url_chain.push_back(download_url);
+  base::FilePath forced_file_path =
+      GetPathInDownloadDir(test_case.forced_file_path);
+  DownloadItem::TargetDisposition initial_disposition =
+      (test_case.test_type == SAVE_AS) ?
+      DownloadItem::TARGET_DISPOSITION_PROMPT :
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE;
+  EXPECT_EQ(test_case.test_type == FORCED,
+            !forced_file_path.empty());
+
+  ON_CALL(*item, GetBrowserContext())
+      .WillByDefault(Return(profile()));
+  ON_CALL(*item, GetDangerType())
+      .WillByDefault(Return(content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS));
+  ON_CALL(*item, GetForcedFilePath())
+      .WillByDefault(ReturnRefOfCopy(forced_file_path));
+  ON_CALL(*item, GetFullPath())
+      .WillByDefault(ReturnRefOfCopy(base::FilePath()));
+  ON_CALL(*item, GetHash())
+      .WillByDefault(ReturnRefOfCopy(std::string()));
+  ON_CALL(*item, GetId())
+      .WillByDefault(Return(id));
+  ON_CALL(*item, GetMimeType())
+      .WillByDefault(Return(test_case.mime_type));
+  ON_CALL(*item, GetReferrerUrl())
+      .WillByDefault(ReturnRefOfCopy(download_url));
+  ON_CALL(*item, GetState())
+      .WillByDefault(Return(DownloadItem::IN_PROGRESS));
+  ON_CALL(*item, GetTargetDisposition())
+      .WillByDefault(Return(initial_disposition));
+  ON_CALL(*item, GetTargetFilePath())
+      .WillByDefault(ReturnRefOfCopy(base::FilePath()));
+  ON_CALL(*item, GetTransitionType())
+      .WillByDefault(Return(content::PAGE_TRANSITION_LINK));
+  ON_CALL(*item, GetURL())
+      .WillByDefault(ReturnRefOfCopy(download_url));
+  ON_CALL(*item, GetUrlChain())
+      .WillByDefault(ReturnRefOfCopy(url_chain));
+  ON_CALL(*item, GetWebContents())
+      .WillByDefault(Return(web_contents()));
+  ON_CALL(*item, HasUserGesture())
+      .WillByDefault(Return(true));
+  ON_CALL(*item, IsDangerous())
+      .WillByDefault(Return(false));
+  ON_CALL(*item, IsInProgress())
+      .WillByDefault(Return(true));
+  ON_CALL(*item, IsTemporary())
+      .WillByDefault(Return(false));
+  return item;
+}
+
+void DownloadTargetDeterminerTest::EnableAutoOpenBasedOnExtension(
+    const base::FilePath& path) {
+  EXPECT_TRUE(download_prefs_->EnableAutoOpenBasedOnExtension(path));
+}
+
+void DownloadTargetDeterminerTest::SetDefaultDownloadPath(
+    const base::FilePath& path) {
+  profile()->GetTestingPrefService()->
+      SetFilePath(prefs::kDownloadDefaultDirectory, path);
+}
+
+void DownloadTargetDeterminerTest::SetManagedDownloadPath(
+    const base::FilePath& path) {
+  profile()->GetTestingPrefService()->
+      SetManagedPref(prefs::kDownloadDefaultDirectory,
+                     base::CreateFilePathValue(path));
+}
+
+void DownloadTargetDeterminerTest::SetPromptForDownload(bool prompt) {
+  profile()->GetTestingPrefService()->
+      SetBoolean(prefs::kPromptForDownload, prompt);
+}
+
+base::FilePath DownloadTargetDeterminerTest::GetPathInDownloadDir(
+    const base::FilePath::StringType& relative_path) {
+  if (relative_path.empty())
+    return base::FilePath();
+  base::FilePath full_path(test_download_dir().Append(relative_path));
+  return full_path.NormalizePathSeparators();
+}
+
+void DownloadTargetDeterminerTest::RunTestCase(
+    const DownloadTestCase& test_case,
+    content::MockDownloadItem* item) {
+  // Kick off the test.
+  base::WeakPtrFactory<DownloadTargetDeterminerTest> factory(this);
+  DownloadTargetDeterminer::Start(
+      item, download_prefs_.get(), last_selected_directory_, delegate(),
+      base::Bind(&DownloadTargetDeterminerTest::DownloadTargetVerifier,
+                 factory.GetWeakPtr(), test_case));
+  message_loop_.RunUntilIdle();
+  ::testing::Mock::VerifyAndClearExpectations(delegate());
+}
+
+void DownloadTargetDeterminerTest::RunTestCasesWithActiveItem(
+    const DownloadTestCase test_cases[],
+    size_t test_case_count) {
+  for (size_t i = 0; i < test_case_count; ++i) {
+    scoped_ptr<content::MockDownloadItem> item(
+        CreateActiveDownloadItem(i, test_cases[i]));
+    SCOPED_TRACE(testing::Message() << "Running test case " << i);
+    RunTestCase(test_cases[i], item.get());
+  }
+}
+
+void DownloadTargetDeterminerTest::DownloadTargetVerifier(
+    const DownloadTestCase& test_case,
+    const base::FilePath& local_path,
+    DownloadItem::TargetDisposition disposition,
+    content::DownloadDangerType danger_type,
+    const base::FilePath& intermediate_path) {
+  base::FilePath expected_local_path(
+      GetPathInDownloadDir(test_case.expected_local_path));
+  EXPECT_EQ(expected_local_path.value(), local_path.value());
+  EXPECT_EQ(test_case.expected_disposition, disposition);
+  EXPECT_EQ(test_case.expected_danger_type, danger_type);
+
+  switch (test_case.expected_intermediate) {
+    case EXPECT_CRDOWNLOAD:
+      EXPECT_EQ(download_util::GetCrDownloadPath(local_path).value(),
+                intermediate_path.value());
+      break;
+
+    case EXPECT_UNCONFIRMED:
+      // The paths (in English) look like: /path/Unconfirmed xxx.crdownload.
+      // Of this, we only check that the path is:
+      // 1. Not "/path/target.crdownload",
+      // 2. Points to the same directory as the target.
+      // 3. Has extension ".crdownload".
+      // 4. Basename starts with "Unconfirmed ".
+      EXPECT_NE(download_util::GetCrDownloadPath(expected_local_path).value(),
+                intermediate_path.value());
+      EXPECT_EQ(expected_local_path.DirName().value(),
+                intermediate_path.DirName().value());
+      EXPECT_TRUE(intermediate_path.MatchesExtension(
+          FILE_PATH_LITERAL(".crdownload")));
+      EXPECT_EQ(0u, intermediate_path.BaseName().value().find(
+          FILE_PATH_LITERAL("Unconfirmed ")));
+      break;
+
+    case EXPECT_LOCAL_PATH:
+      EXPECT_EQ(expected_local_path.value(), intermediate_path.value());
+      break;
+  }
+}
+
+// static
+void MockDownloadTargetDeterminerDelegate::NullReserveVirtualPath(
+    DownloadItem* download,
+    const base::FilePath& virtual_path,
+    DownloadPathReservationTracker::FilenameConflictAction conflict_action,
+    const DownloadTargetDeterminerDelegate::ReservedPathCallback& callback) {
+  callback.Run(virtual_path, true);
+}
+
+// static
+void MockDownloadTargetDeterminerDelegate::NullPromptUser(
+    DownloadItem* download, const base::FilePath& suggested_path,
+    const FileSelectedCallback& callback) {
+  callback.Run(suggested_path);
+}
+
+// static
+void MockDownloadTargetDeterminerDelegate::NullDetermineLocalPath(
+    DownloadItem* download, const base::FilePath& virtual_path,
+    const LocalPathCallback& callback) {
+  callback.Run(virtual_path);
+}
+
+// NotifyExtensions implementation that overrides the path so that the target
+// file is in a subdirectory called 'overridden'. If the extension is '.remove',
+// the extension is removed.
+void NotifyExtensionsOverridePath(
+    content::DownloadItem* download,
+    const base::FilePath& path,
+    const DownloadTargetDeterminerDelegate::NotifyExtensionsCallback&
+        callback) {
+  base::FilePath new_path =
+      base::FilePath()
+      .AppendASCII("overridden")
+      .Append(path.BaseName());
+  if (new_path.MatchesExtension(FILE_PATH_LITERAL(".remove")))
+    new_path = new_path.RemoveExtension();
+  callback.Run(new_path, DownloadPathReservationTracker::UNIQUIFY);
+}
+
+void CheckDownloadUrlCheckExes(
+    content::DownloadItem* download,
+    const base::FilePath& path,
+    const DownloadTargetDeterminerDelegate::CheckDownloadUrlCallback&
+        callback) {
+  if (path.MatchesExtension(FILE_PATH_LITERAL(".exe")))
+    callback.Run(content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT);
+  else
+    callback.Run(content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS);
+}
+
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_Basic) {
+  const DownloadTestCase kBasicTestCases[] = {
+    {
+      // 0: Automatic Safe
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 1: Save_As Safe
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 2: Automatic Dangerous
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE,
+      "http://example.com/foo.html", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 3: Forced Safe
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "",
+      FILE_PATH_LITERAL("forced-foo.txt"),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("forced-foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    },
+  };
+
+  // The test assumes that .html files have a danger level of
+  // AllowOnUserGesture.
+  ASSERT_EQ(download_util::AllowOnUserGesture,
+            download_util::GetFileDangerLevel(
+                base::FilePath(FILE_PATH_LITERAL("foo.html"))));
+  RunTestCasesWithActiveItem(kBasicTestCases, arraysize(kBasicTestCases));
+}
+
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_CancelSaveAs) {
+  const DownloadTestCase kCancelSaveAsTestCases[] = {
+    {
+      // 0: Save_As Safe, Cancelled.
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL(""),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_LOCAL_PATH
+    }
+  };
+  ON_CALL(*delegate(), PromptUserForDownloadPath(_, _, _))
+      .WillByDefault(WithArg<2>(ScheduleCallback(base::FilePath())));
+  RunTestCasesWithActiveItem(kCancelSaveAsTestCases,
+                             arraysize(kCancelSaveAsTestCases));
+}
+
+// The SafeBrowsing check is performed early. Make sure that a download item
+// that has been marked as DANGEROUS_URL behaves correctly.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_DangerousUrl) {
+  const DownloadTestCase kSafeBrowsingTestCases[] = {
+    {
+      // 0: Automatic Dangerous URL
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL,
+      "http://phishing.example.com/foo.txt", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 1: Save As Dangerous URL
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL,
+      "http://phishing.example.com/foo.txt", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 2: Forced Dangerous URL
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL,
+      "http://phishing.example.com/foo.txt", "",
+      FILE_PATH_LITERAL("forced-foo.txt"),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("forced-foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 3: Automatic Dangerous URL + Dangerous file. Dangerous URL takes
+      // precendence.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL,
+      "http://phishing.example.com/foo.html", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 4: Save As Dangerous URL + Dangerous file
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL,
+      "http://phishing.example.com/foo.html", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.html"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 5: Forced Dangerous URL + Dangerous file
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL,
+      "http://phishing.example.com/foo.html", "",
+      FILE_PATH_LITERAL("forced-foo.html"),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("forced-foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+  };
+
+  ON_CALL(*delegate(), CheckDownloadUrl(_, _, _))
+      .WillByDefault(WithArg<2>(ScheduleCallback(
+          content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL)));
+  RunTestCasesWithActiveItem(kSafeBrowsingTestCases,
+                             arraysize(kSafeBrowsingTestCases));
+}
+
+// The SafeBrowsing check is performed early. Make sure that a download item
+// that has been marked as MAYBE_DANGEROUS_CONTENT behaves correctly.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_MaybeDangerousContent) {
+  const DownloadTestCase kSafeBrowsingTestCases[] = {
+    {
+      // 0: Automatic Maybe dangerous content
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT,
+      "http://phishing.example.com/foo.exe", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.exe"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 1: Save As Maybe dangerous content
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT,
+      "http://phishing.example.com/foo.exe", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.exe"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 2: Forced Maybe dangerous content
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT,
+      "http://phishing.example.com/foo.exe", "",
+      FILE_PATH_LITERAL("forced-foo.exe"),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("forced-foo.exe"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+  };
+
+  ON_CALL(*delegate(), CheckDownloadUrl(_, _, _))
+      .WillByDefault(WithArg<2>(ScheduleCallback(
+          content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT)));
+  RunTestCasesWithActiveItem(kSafeBrowsingTestCases,
+                             arraysize(kSafeBrowsingTestCases));
+}
+
+// Test whether the last saved directory is used for 'Save As' downloads.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_LastSavePath) {
+  const DownloadTestCase kLastSavePathTestCasesPre[] = {
+    {
+      // 0: If the last save path is empty, then the default download directory
+      //    should be used.
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    }
+  };
+
+  // These test cases are run with a last save path set to a non-emtpy local
+  // download directory.
+  const DownloadTestCase kLastSavePathTestCasesPost[] = {
+    {
+      // 0: This test case is run with the last download directory set to
+      //    '<test_download_dir()>/foo'.
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo/foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 1: Start an automatic download. This should be saved to the user's
+      //    default download directory and not the last used Save As directory.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+  };
+
+  // This test case is run with the last save path set to a non-empty virtual
+  // directory.
+  const DownloadTestCase kLastSavePathTestCasesVirtual[] = {
+    {
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL("virtual/foo/foo.txt"),
+      FILE_PATH_LITERAL("bar.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_LOCAL_PATH
+    },
+  };
+
+  {
+    SCOPED_TRACE(testing::Message()
+                 << "Running with empty last_selected_directory");
+    base::FilePath prompt_path =
+        GetPathInDownloadDir(FILE_PATH_LITERAL("foo.txt"));
+    EXPECT_CALL(*delegate(), PromptUserForDownloadPath(_, prompt_path, _));
+    RunTestCasesWithActiveItem(kLastSavePathTestCasesPre,
+                               arraysize(kLastSavePathTestCasesPre));
+  }
+
+  // Try with a non-empty last save path.
+  {
+    SCOPED_TRACE(testing::Message()
+                 << "Running with local last_selected_directory");
+    set_last_selected_directory(test_download_dir().AppendASCII("foo"));
+    base::FilePath prompt_path =
+        GetPathInDownloadDir(FILE_PATH_LITERAL("foo/foo.txt"));
+    EXPECT_CALL(*delegate(), PromptUserForDownloadPath(_, prompt_path, _));
+    RunTestCasesWithActiveItem(kLastSavePathTestCasesPost,
+                               arraysize(kLastSavePathTestCasesPost));
+  }
+
+  // And again, but this time use a virtual directory.
+  {
+    SCOPED_TRACE(testing::Message()
+                 << "Running with virtual last_selected_directory");
+    base::FilePath last_selected_dir = test_virtual_dir().AppendASCII("foo");
+    base::FilePath virtual_path = last_selected_dir.AppendASCII("foo.txt");
+    set_last_selected_directory(last_selected_dir);
+    EXPECT_CALL(*delegate(), PromptUserForDownloadPath(
+        _, last_selected_dir.AppendASCII("foo.txt"), _));
+    EXPECT_CALL(*delegate(), DetermineLocalPath(_, virtual_path, _))
+        .WillOnce(WithArg<2>(ScheduleCallback(
+            GetPathInDownloadDir(FILE_PATH_LITERAL("bar.txt")))));
+    RunTestCasesWithActiveItem(kLastSavePathTestCasesVirtual,
+                               arraysize(kLastSavePathTestCasesVirtual));
+  }
+}
+
+// These tests are run with the default downloads folder set to a virtual
+// directory.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_DefaultVirtual) {
+  // The default download directory is the virutal path.
+  SetDefaultDownloadPath(test_virtual_dir());
+
+  {
+    SCOPED_TRACE(testing::Message() << "Automatic Safe Download");
+    const DownloadTestCase kAutomaticDownloadToVirtualDir = {
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      // Downloaded to default virtual directory.
+      FILE_PATH_LITERAL("virtual/foo.txt"),
+      FILE_PATH_LITERAL("foo-local.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    };
+    EXPECT_CALL(*delegate(), DetermineLocalPath(_, _, _))
+        .WillOnce(WithArg<2>(ScheduleCallback(
+            GetPathInDownloadDir(FILE_PATH_LITERAL("foo-local.txt")))));
+    RunTestCasesWithActiveItem(&kAutomaticDownloadToVirtualDir, 1);
+  }
+
+  {
+    SCOPED_TRACE(testing::Message() << "Save As to virtual directory");
+    const DownloadTestCase kSaveAsToVirtualDir = {
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/bar.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      // The response to the download prompt is to choose the 'prompted.txt'
+      // virtual path.
+      FILE_PATH_LITERAL("virtual/prompted.txt"),
+      FILE_PATH_LITERAL("foo-local.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_LOCAL_PATH
+    };
+    EXPECT_CALL(*delegate(), DetermineLocalPath(_, _, _))
+        .WillOnce(WithArg<2>(ScheduleCallback(
+            GetPathInDownloadDir(FILE_PATH_LITERAL("foo-local.txt")))));
+    EXPECT_CALL(*delegate(), PromptUserForDownloadPath(
+        _, test_virtual_dir().AppendASCII("bar.txt"), _))
+        .WillOnce(WithArg<2>(ScheduleCallback(
+            test_virtual_dir().AppendASCII("prompted.txt"))));
+    RunTestCasesWithActiveItem(&kSaveAsToVirtualDir, 1);
+  }
+
+  {
+    SCOPED_TRACE(testing::Message() << "Save As to local directory");
+    const DownloadTestCase kSaveAsToLocalDir = {
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/bar.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      // Response to the 'Save As' is to choose the local path for 'foo-x.txt'.
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo-x.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    };
+    EXPECT_CALL(*delegate(), PromptUserForDownloadPath(
+        _, test_virtual_dir().AppendASCII("bar.txt"), _))
+        .WillOnce(WithArg<2>(ScheduleCallback(
+            GetPathInDownloadDir(FILE_PATH_LITERAL("foo-x.txt")))));
+    RunTestCasesWithActiveItem(&kSaveAsToLocalDir, 1);
+  }
+
+  {
+    SCOPED_TRACE(testing::Message() << "Forced safe download");
+    const DownloadTestCase kForcedSafe = {
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "",
+      FILE_PATH_LITERAL("forced-foo.txt"),
+
+      // Forced paths should be left as-is.
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("forced-foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    };
+    RunTestCasesWithActiveItem(&kForcedSafe, 1);
+  }
+}
+
+// Test that an inactive download will still get a virtual or local download
+// path.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_InactiveDownload) {
+  const DownloadTestCase kInactiveTestCases[] = {
+    {
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL("foo.txt"),
+      FILE_PATH_LITERAL(""),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    },
+
+    {
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL("foo.txt"),
+      FILE_PATH_LITERAL(""),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_LOCAL_PATH
+    }
+  };
+
+  for (size_t i = 0; i < arraysize(kInactiveTestCases); ++i) {
+    SCOPED_TRACE(testing::Message() << "Running test case " << i);
+    const DownloadTestCase& test_case = kInactiveTestCases[i];
+    scoped_ptr<content::MockDownloadItem> item(
+        CreateActiveDownloadItem(i, test_case));
+    EXPECT_CALL(*item.get(), IsInProgress())
+        .WillRepeatedly(Return(false));
+    // Even though one is a SAVE_AS download, no prompt will be displayed to
+    // the user because the download is inactive.
+    EXPECT_CALL(*delegate(), PromptUserForDownloadPath(_, _, _))
+        .Times(0);
+    RunTestCase(kInactiveTestCases[i], item.get());
+  }
+}
+
+// If the reserved path could not be verified, then the user should see a
+// prompt.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_ReservationFailed) {
+  const DownloadTestCase kReservationFailedCases[] = {
+    {
+      // 0: Automatic download. Since the reservation fails, the disposition of
+      // the target is to prompt, but the returned path is used.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("bar.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    },
+  };
+
+  // Setup ReserveVirtualPath() to fail.
+  ON_CALL(*delegate(), ReserveVirtualPath(_, _, _, _))
+      .WillByDefault(WithArg<3>(ScheduleCallback2(
+          GetPathInDownloadDir(FILE_PATH_LITERAL("bar.txt")), false)));
+  RunTestCasesWithActiveItem(kReservationFailedCases,
+                             arraysize(kReservationFailedCases));
+}
+
+// If the local path could not be determined, the download should be cancelled.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_LocalPathFailed) {
+  const DownloadTestCase kLocalPathFailedCases[] = {
+    {
+      // 0: Automatic download.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL(""),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    },
+  };
+
+  base::FilePath expected_virtual_path(
+      GetPathInDownloadDir(FILE_PATH_LITERAL("virtual/foo.txt")));
+  // The default download directory is the virtual path.
+  SetDefaultDownloadPath(test_virtual_dir());
+  // Simulate failed call to DetermineLocalPath.
+  EXPECT_CALL(*delegate(), DetermineLocalPath(
+      _, GetPathInDownloadDir(FILE_PATH_LITERAL("virtual/foo.txt")), _))
+      .WillOnce(WithArg<2>(ScheduleCallback(base::FilePath())));
+  RunTestCasesWithActiveItem(kLocalPathFailedCases,
+                             arraysize(kLocalPathFailedCases));
+}
+
+// Downloads that have a danger level of AllowOnUserGesture should be marked as
+// safe depending on whether there was a user gesture associated with the
+// download and whether the referrer was visited prior to today.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_VisitedReferrer) {
+  const DownloadTestCase kVisitedReferrerCases[] = {
+    // http://visited.example.com/ is added to the history as a visit that
+    // happened prior to today.
+    {
+      // 0: Safe download due to visiting referrer before.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://visited.example.com/foo.html", "text/html",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 1: Dangerous due to not having visited referrer before.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE,
+      "http://not-visited.example.com/foo.html", "text/html",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 2: Safe because the user is being prompted.
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://not-visited.example.com/foo.html", "text/html",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.html"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 3: Safe because of forced path.
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://not-visited.example.com/foo.html", "text/html",
+      FILE_PATH_LITERAL("foo.html"),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    },
+  };
+
+  // This test assumes that the danger level of .html files is
+  // AllowOnUserGesture.
+  ASSERT_EQ(download_util::AllowOnUserGesture,
+            download_util::GetFileDangerLevel(
+                base::FilePath(FILE_PATH_LITERAL("foo.html"))));
+
+  // First the history service must exist.
+  profile()->CreateHistoryService(false, false);
+
+  GURL url("http://visited.example.com/visited-link.html");
+  // The time of visit is picked to be several seconds prior to the most recent
+  // midnight.
+  base::Time time_of_visit(
+      base::Time::Now().LocalMidnight() - base::TimeDelta::FromSeconds(10));
+  HistoryService* history_service =
+      HistoryServiceFactory::GetForProfile(profile(), Profile::EXPLICIT_ACCESS);
+  ASSERT_TRUE(history_service);
+  history_service->AddPage(url, time_of_visit, history::SOURCE_BROWSED);
+
+  RunTestCasesWithActiveItem(kVisitedReferrerCases,
+                             arraysize(kVisitedReferrerCases));
+}
+
+// These test cases are run with "Prompt for download" user preference set to
+// true.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_PromptAlways) {
+  const DownloadTestCase kPromptingTestCases[] = {
+    {
+      // 0: Safe Automatic - Should prompt because of "Prompt for download"
+      //    preference setting.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 1: Safe Forced - Shouldn't prompt.
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL("foo.txt"),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    },
+
+    {
+      // 2: Automatic - The filename extension is marked as one that we will
+      //    open automatically. Shouldn't prompt.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.dummy", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.dummy"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+  };
+
+  SetPromptForDownload(true);
+  EnableAutoOpenBasedOnExtension(
+      base::FilePath(FILE_PATH_LITERAL("dummy.dummy")));
+  RunTestCasesWithActiveItem(kPromptingTestCases,
+                             arraysize(kPromptingTestCases));
+}
+
+#if !defined(OS_ANDROID)
+// These test cases are run with "Prompt for download" user preference set to
+// true. Automatic extension downloads shouldn't cause prompting.
+// Android doesn't support extensions.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_PromptAlways_Extension) {
+  const DownloadTestCase kPromptingTestCases[] = {
+    {
+      // 0: Automatic Browser Extension download. - Shouldn't prompt for browser
+      //    extension downloads even if "Prompt for download" preference is set.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE,
+      "http://example.com/foo.crx",
+      extensions::Extension::kMimeType,
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.crx"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+#if defined(OS_WIN)
+    {
+      // 1: Automatic User Script - Shouldn't prompt for user script downloads
+      //    even if "Prompt for download" preference is set. ".js" files are
+      //    considered dangerous on Windows.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE,
+      "http://example.com/foo.user.js", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.user.js"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+#else
+    {
+      // 1: Automatic User Script - Shouldn't prompt for user script downloads
+      //    even if "Prompt for download" preference is set.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.user.js", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.user.js"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+#endif
+  };
+
+  SetPromptForDownload(true);
+  RunTestCasesWithActiveItem(kPromptingTestCases,
+                             arraysize(kPromptingTestCases));
+}
+#endif
+
+// If the download path is managed, then we don't show any prompts.
+// Note that if the download path is managed, then PromptForDownload() is false.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_ManagedPath) {
+  const DownloadTestCase kManagedPathTestCases[] = {
+    {
+      // 0: Automatic Safe
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 1: Save_As Safe
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+  };
+
+  SetManagedDownloadPath(test_download_dir());
+  ASSERT_TRUE(download_prefs()->IsDownloadPathManaged());
+  RunTestCasesWithActiveItem(kManagedPathTestCases,
+                             arraysize(kManagedPathTestCases));
+}
+
+// Test basic functionality supporting extensions that want to override download
+// filenames.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_NotifyExtensionsSafe) {
+  const DownloadTestCase kNotifyExtensionsTestCases[] = {
+    {
+      // 0: Automatic Safe
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("overridden/foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 1: Save_As Safe
+      SAVE_AS,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("overridden/foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+      EXPECT_CRDOWNLOAD
+    },
+
+    {
+      // 2: Automatic Dangerous
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE,
+      "http://example.com/foo.html", "",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("overridden/foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 3: Forced Safe
+      FORCED,
+      content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+      "http://example.com/foo.txt", "",
+      FILE_PATH_LITERAL("forced-foo.txt"),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("forced-foo.txt"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_LOCAL_PATH
+    },
+  };
+
+  ON_CALL(*delegate(), NotifyExtensions(_, _, _))
+      .WillByDefault(Invoke(&NotifyExtensionsOverridePath));
+  RunTestCasesWithActiveItem(kNotifyExtensionsTestCases,
+                             arraysize(kNotifyExtensionsTestCases));
+}
+
+// Test that filenames provided by extensions are passed into SafeBrowsing
+// checks and dangerous download checks.
+TEST_F(DownloadTargetDeterminerTest, TargetDeterminer_NotifyExtensionsUnsafe) {
+  const DownloadTestCase kNotifyExtensionsTestCases[] = {
+    {
+      // 0: Automatic Safe : Later overridden by a dangerous filetype.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE,
+      "http://example.com/foo.html.remove", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("overridden/foo.html"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+
+    {
+      // 1: Automatic Safe : Later overridden by a potentially dangerous
+      // filetype.
+      AUTOMATIC,
+      content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT,
+      "http://example.com/foo.exe.remove", "text/plain",
+      FILE_PATH_LITERAL(""),
+
+      FILE_PATH_LITERAL(""),
+      FILE_PATH_LITERAL("overridden/foo.exe"),
+      DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+      EXPECT_UNCONFIRMED
+    },
+  };
+
+  ON_CALL(*delegate(), NotifyExtensions(_, _, _))
+      .WillByDefault(Invoke(&NotifyExtensionsOverridePath));
+  ON_CALL(*delegate(), CheckDownloadUrl(_, _, _))
+      .WillByDefault(Invoke(&CheckDownloadUrlCheckExes));
+  RunTestCasesWithActiveItem(kNotifyExtensionsTestCases,
+                             arraysize(kNotifyExtensionsTestCases));
+}
+
+// Test that conflict actions set by extensions are passed correctly into
+// ReserveVirtualPath.
+TEST_F(DownloadTargetDeterminerTest,
+       TargetDeterminer_NotifyExtensionsConflict) {
+  const DownloadTestCase kNotifyExtensionsTestCase = {
+    AUTOMATIC,
+    content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+    "http://example.com/foo.txt", "text/plain",
+    FILE_PATH_LITERAL(""),
+
+    FILE_PATH_LITERAL(""),
+    FILE_PATH_LITERAL("overridden/foo.txt"),
+    DownloadItem::TARGET_DISPOSITION_OVERWRITE,
+
+    EXPECT_CRDOWNLOAD
+  };
+
+  const DownloadTestCase& test_case = kNotifyExtensionsTestCase;
+  scoped_ptr<content::MockDownloadItem> item(
+      CreateActiveDownloadItem(0, test_case));
+  base::FilePath overridden_path(FILE_PATH_LITERAL("overridden/foo.txt"));
+  base::FilePath full_overridden_path =
+      GetPathInDownloadDir(overridden_path.value());
+
+  // First case: An extension sets the conflict_action to OVERWRITE.
+  EXPECT_CALL(*delegate(), NotifyExtensions(_, _, _))
+      .WillOnce(WithArg<2>(
+          ScheduleCallback2(overridden_path,
+                            DownloadPathReservationTracker::OVERWRITE)));
+  EXPECT_CALL(*delegate(), ReserveVirtualPath(
+      _, full_overridden_path, DownloadPathReservationTracker::OVERWRITE, _))
+      .WillOnce(WithArg<3>(
+          ScheduleCallback2(full_overridden_path, true)));
+
+  RunTestCase(test_case, item.get());
+
+  // Second case: An extension sets the conflict_action to PROMPT.
+  EXPECT_CALL(*delegate(), NotifyExtensions(_, _, _))
+      .WillOnce(WithArg<2>(
+          ScheduleCallback2(overridden_path,
+                            DownloadPathReservationTracker::PROMPT)));
+  EXPECT_CALL(*delegate(), ReserveVirtualPath(
+      _, full_overridden_path, DownloadPathReservationTracker::PROMPT, _))
+      .WillOnce(WithArg<3>(
+          ScheduleCallback2(full_overridden_path, true)));
+  RunTestCase(test_case, item.get());
+}
+
+// Test that relative paths returned by extensions are always relative to the
+// default downloads path.
+TEST_F(DownloadTargetDeterminerTest,
+       TargetDeterminer_NotifyExtensionsDefaultPath) {
+  const DownloadTestCase kNotifyExtensionsTestCase = {
+    SAVE_AS,
+    content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
+    "http://example.com/foo.txt", "text/plain",
+    FILE_PATH_LITERAL(""),
+
+    FILE_PATH_LITERAL(""),
+    FILE_PATH_LITERAL("overridden/foo.txt"),
+    DownloadItem::TARGET_DISPOSITION_PROMPT,
+
+    EXPECT_CRDOWNLOAD
+  };
+
+  const DownloadTestCase& test_case = kNotifyExtensionsTestCase;
+  scoped_ptr<content::MockDownloadItem> item(
+      CreateActiveDownloadItem(0, test_case));
+  base::FilePath overridden_path(FILE_PATH_LITERAL("overridden/foo.txt"));
+  base::FilePath full_overridden_path =
+      GetPathInDownloadDir(overridden_path.value());
+
+  // The last selected directory is this one. Since the test case is a SAVE_AS
+  // download, it should use this directory for the generated path.
+  set_last_selected_directory(GetPathInDownloadDir(
+      FILE_PATH_LITERAL("last_selected")));
+
+  EXPECT_CALL(*delegate(), NotifyExtensions(_, _, _))
+      .WillOnce(WithArg<2>(
+          ScheduleCallback2(overridden_path,
+                            DownloadPathReservationTracker::UNIQUIFY)));
+  EXPECT_CALL(*delegate(),
+              PromptUserForDownloadPath(_, full_overridden_path, _))
+      .WillOnce(WithArg<2>(
+          ScheduleCallback(full_overridden_path)));
+  RunTestCase(test_case, item.get());
+}
+}  // namespace