src/chrome/browser/download/download_path_reservation_tracker_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/file_util.h"
   6 #include "base/files/file_path.h"
   7 #include "base/files/scoped_temp_dir.h"
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "base/observer_list.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/test/test_file_util.h"
  13 #include "chrome/browser/download/download_path_reservation_tracker.h"
  14 #include "chrome/browser/download/download_target_determiner.h"
  15 #include "content/public/test/mock_download_item.h"
  16 #include "content/public/test/test_browser_thread.h"
  17 #include "testing/gmock/include/gmock/gmock.h"
  18 #include "testing/gtest/include/gtest/gtest.h"
  19
  20 using content::BrowserThread;
  21 using content::DownloadItem;
  22 using content::MockDownloadItem;
  23 using testing::AnyNumber;
  24 using testing::Return;
  25 using testing::ReturnRef;
  26 using testing::ReturnRefOfCopy;
  27
  28 namespace {
  29
  30 class DownloadPathReservationTrackerTest : public testing::Test {
  31  public:
  32   DownloadPathReservationTrackerTest();
  33
  34   // testing::Test
  35   virtual void SetUp() OVERRIDE;
  36   virtual void TearDown() OVERRIDE;
  37
  38   MockDownloadItem* CreateDownloadItem(int32 id);
  39   base::FilePath GetPathInDownloadsDirectory(
  40       const base::FilePath::CharType* suffix);
  41   bool IsPathInUse(const base::FilePath& path);
  42   void CallGetReservedPath(
  43       DownloadItem* download_item,
  44       const base::FilePath& target_path,
  45       bool create_directory,
  46       DownloadPathReservationTracker::FilenameConflictAction conflict_action,
  47       base::FilePath* return_path,
  48       bool* return_verified);
  49
  50   const base::FilePath& default_download_path() const {
  51     return default_download_path_;
  52   }
  53   void set_default_download_path(const base::FilePath& path) {
  54     default_download_path_ = path;
  55   }
  56   // Creates a name of form 'a'*repeat + suffix
  57   base::FilePath GetLongNamePathInDownloadsDirectory(
  58       size_t repeat, const base::FilePath::CharType* suffix);
  59
  60  protected:
  61   base::ScopedTempDir test_download_dir_;
  62   base::FilePath default_download_path_;
  63   base::MessageLoopForUI message_loop_;
  64   content::TestBrowserThread ui_thread_;
  65   content::TestBrowserThread file_thread_;
  66
  67  private:
  68   void TestReservedPathCallback(base::FilePath* return_path,
  69                                 bool* return_verified, bool* did_run_callback,
  70                                 const base::FilePath& path, bool verified);
  71 };
  72
  73 DownloadPathReservationTrackerTest::DownloadPathReservationTrackerTest()
  74     : ui_thread_(BrowserThread::UI, &message_loop_),
  75       file_thread_(BrowserThread::FILE, &message_loop_) {
  76 }
  77
  78 void DownloadPathReservationTrackerTest::SetUp() {
  79   ASSERT_TRUE(test_download_dir_.CreateUniqueTempDir());
  80   set_default_download_path(test_download_dir_.path());
  81 }
  82
  83 void DownloadPathReservationTrackerTest::TearDown() {
  84   message_loop_.RunUntilIdle();
  85 }
  86
  87 MockDownloadItem* DownloadPathReservationTrackerTest::CreateDownloadItem(
  88     int32 id) {
  89   MockDownloadItem* item = new ::testing::StrictMock<MockDownloadItem>;
  90   EXPECT_CALL(*item, GetId())
  91       .WillRepeatedly(Return(id));
  92   EXPECT_CALL(*item, GetTargetFilePath())
  93       .WillRepeatedly(ReturnRefOfCopy(base::FilePath()));
  94   EXPECT_CALL(*item, GetState())
  95       .WillRepeatedly(Return(DownloadItem::IN_PROGRESS));
  96   return item;
  97 }
  98
  99 base::FilePath DownloadPathReservationTrackerTest::GetPathInDownloadsDirectory(
 100     const base::FilePath::CharType* suffix) {
 101   return default_download_path().Append(suffix).NormalizePathSeparators();
 102 }
 103
 104 bool DownloadPathReservationTrackerTest::IsPathInUse(
 105     const base::FilePath& path) {
 106   return DownloadPathReservationTracker::IsPathInUseForTesting(path);
 107 }
 108
 109 void DownloadPathReservationTrackerTest::CallGetReservedPath(
 110     DownloadItem* download_item,
 111     const base::FilePath& target_path,
 112     bool create_directory,
 113     DownloadPathReservationTracker::FilenameConflictAction conflict_action,
 114     base::FilePath* return_path,
 115     bool* return_verified) {
 116   // Weak pointer factory to prevent the callback from running after this
 117   // function has returned.
 118   base::WeakPtrFactory<DownloadPathReservationTrackerTest> weak_ptr_factory(
 119       this);
 120   bool did_run_callback = false;
 121   DownloadPathReservationTracker::GetReservedPath(
 122       download_item,
 123       target_path,
 124       default_download_path(),
 125       create_directory,
 126       conflict_action,
 127       base::Bind(&DownloadPathReservationTrackerTest::TestReservedPathCallback,
 128                  weak_ptr_factory.GetWeakPtr(), return_path, return_verified,
 129                  &did_run_callback));
 130   message_loop_.RunUntilIdle();
 131   EXPECT_TRUE(did_run_callback);
 132 }
 133
 134 void DownloadPathReservationTrackerTest::TestReservedPathCallback(
 135     base::FilePath* return_path, bool* return_verified, bool* did_run_callback,
 136     const base::FilePath& path, bool verified) {
 137   *did_run_callback = true;
 138   *return_path = path;
 139   *return_verified = verified;
 140 }
 141
 142 base::FilePath
 143 DownloadPathReservationTrackerTest::GetLongNamePathInDownloadsDirectory(
 144     size_t repeat, const base::FilePath::CharType* suffix) {
 145   return GetPathInDownloadsDirectory(
 146       (base::FilePath::StringType(repeat, FILE_PATH_LITERAL('a'))
 147           + suffix).c_str());
 148 }
 149
 150 void SetDownloadItemState(content::MockDownloadItem* download_item,
 151                           content::DownloadItem::DownloadState state) {
 152   EXPECT_CALL(*download_item, GetState())
 153       .WillRepeatedly(Return(state));
 154   download_item->NotifyObserversDownloadUpdated();
 155 }
 156
 157 }  // namespace
 158
 159 // A basic reservation is acquired and committed.
 160 TEST_F(DownloadPathReservationTrackerTest, BasicReservation) {
 161   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 162   base::FilePath path(
 163       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 164   ASSERT_FALSE(IsPathInUse(path));
 165
 166   base::FilePath reserved_path;
 167   bool verified = false;
 168   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 169     DownloadPathReservationTracker::OVERWRITE;
 170   bool create_directory = false;
 171   CallGetReservedPath(
 172       item.get(),
 173       path,
 174       create_directory,
 175       conflict_action,
 176       &reserved_path,
 177       &verified);
 178   EXPECT_TRUE(IsPathInUse(path));
 179   EXPECT_TRUE(verified);
 180   EXPECT_EQ(path.value(), reserved_path.value());
 181
 182   // Destroying the item should release the reservation.
 183   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 184   item.reset();
 185   message_loop_.RunUntilIdle();
 186   EXPECT_FALSE(IsPathInUse(path));
 187 }
 188
 189 // A download that is interrupted should lose its reservation.
 190 TEST_F(DownloadPathReservationTrackerTest, InterruptedDownload) {
 191   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 192   base::FilePath path(
 193       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 194   ASSERT_FALSE(IsPathInUse(path));
 195
 196   base::FilePath reserved_path;
 197   bool verified = false;
 198   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 199     DownloadPathReservationTracker::OVERWRITE;
 200   bool create_directory = false;
 201   CallGetReservedPath(
 202       item.get(),
 203       path,
 204       create_directory,
 205       conflict_action,
 206       &reserved_path,
 207       &verified);
 208   EXPECT_TRUE(IsPathInUse(path));
 209   EXPECT_TRUE(verified);
 210   EXPECT_EQ(path.value(), reserved_path.value());
 211
 212   // Once the download is interrupted, the path should become available again.
 213   SetDownloadItemState(item.get(), DownloadItem::INTERRUPTED);
 214   message_loop_.RunUntilIdle();
 215   EXPECT_FALSE(IsPathInUse(path));
 216 }
 217
 218 // A completed download should also lose its reservation.
 219 TEST_F(DownloadPathReservationTrackerTest, CompleteDownload) {
 220   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 221   base::FilePath path(
 222       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 223   ASSERT_FALSE(IsPathInUse(path));
 224
 225   base::FilePath reserved_path;
 226   bool verified = false;
 227   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 228     DownloadPathReservationTracker::OVERWRITE;
 229   bool create_directory = false;
 230   CallGetReservedPath(
 231       item.get(),
 232       path,
 233       create_directory,
 234       conflict_action,
 235       &reserved_path,
 236       &verified);
 237   EXPECT_TRUE(IsPathInUse(path));
 238   EXPECT_TRUE(verified);
 239   EXPECT_EQ(path.value(), reserved_path.value());
 240
 241   // Once the download completes, the path should become available again. For a
 242   // real download, at this point only the path reservation will be released.
 243   // The path wouldn't be available since it is occupied on disk by the
 244   // completed download.
 245   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 246   message_loop_.RunUntilIdle();
 247   EXPECT_FALSE(IsPathInUse(path));
 248 }
 249
 250 // If there are files on the file system, a unique reservation should uniquify
 251 // around it.
 252 TEST_F(DownloadPathReservationTrackerTest, ConflictingFiles) {
 253   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 254   base::FilePath path(
 255       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 256   base::FilePath path1(
 257       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo (1).txt")));
 258   // Create a file at |path|, and a .crdownload file at |path1|.
 259   ASSERT_EQ(0, base::WriteFile(path, "", 0));
 260   ASSERT_EQ(0,
 261             base::WriteFile(
 262                 DownloadTargetDeterminer::GetCrDownloadPath(path1), "", 0));
 263   ASSERT_TRUE(IsPathInUse(path));
 264
 265   base::FilePath reserved_path;
 266   bool verified = false;
 267   bool create_directory = false;
 268   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 269     DownloadPathReservationTracker::UNIQUIFY;
 270   CallGetReservedPath(
 271       item.get(),
 272       path,
 273       create_directory,
 274       conflict_action,
 275       &reserved_path,
 276       &verified);
 277   EXPECT_TRUE(IsPathInUse(path));
 278   EXPECT_TRUE(IsPathInUse(reserved_path));
 279   EXPECT_TRUE(verified);
 280   // The path should be uniquified, skipping over foo.txt but not over
 281   // "foo (1).txt.crdownload"
 282   EXPECT_EQ(
 283       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo (1).txt")).value(),
 284       reserved_path.value());
 285
 286   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 287   item.reset();
 288   message_loop_.RunUntilIdle();
 289   EXPECT_TRUE(IsPathInUse(path));
 290   EXPECT_FALSE(IsPathInUse(reserved_path));
 291 }
 292
 293 // Multiple reservations for the same path should uniquify around each other.
 294 TEST_F(DownloadPathReservationTrackerTest, ConflictingReservations) {
 295   scoped_ptr<MockDownloadItem> item1(CreateDownloadItem(1));
 296   base::FilePath path(
 297       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 298   base::FilePath uniquified_path(
 299       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo (1).txt")));
 300   ASSERT_FALSE(IsPathInUse(path));
 301   ASSERT_FALSE(IsPathInUse(uniquified_path));
 302
 303   base::FilePath reserved_path1;
 304   bool verified = false;
 305   bool create_directory = false;
 306
 307   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 308     DownloadPathReservationTracker::UNIQUIFY;
 309   CallGetReservedPath(
 310       item1.get(),
 311       path,
 312       create_directory,
 313       conflict_action,
 314       &reserved_path1,
 315       &verified);
 316   EXPECT_TRUE(IsPathInUse(path));
 317   EXPECT_TRUE(verified);
 318
 319
 320   {
 321     // Requesting a reservation for the same path with uniquification results in
 322     // a uniquified path.
 323     scoped_ptr<MockDownloadItem> item2(CreateDownloadItem(2));
 324     base::FilePath reserved_path2;
 325     CallGetReservedPath(
 326         item2.get(),
 327         path,
 328         create_directory,
 329         conflict_action,
 330         &reserved_path2,
 331         &verified);
 332     EXPECT_TRUE(IsPathInUse(path));
 333     EXPECT_TRUE(IsPathInUse(uniquified_path));
 334     EXPECT_EQ(uniquified_path.value(), reserved_path2.value());
 335     SetDownloadItemState(item2.get(), DownloadItem::COMPLETE);
 336   }
 337   message_loop_.RunUntilIdle();
 338   EXPECT_TRUE(IsPathInUse(path));
 339   EXPECT_FALSE(IsPathInUse(uniquified_path));
 340
 341   {
 342     // Since the previous download item was removed, requesting a reservation
 343     // for the same path should result in the same uniquified path.
 344     scoped_ptr<MockDownloadItem> item2(CreateDownloadItem(2));
 345     base::FilePath reserved_path2;
 346     CallGetReservedPath(
 347         item2.get(),
 348         path,
 349         create_directory,
 350         conflict_action,
 351         &reserved_path2,
 352         &verified);
 353     EXPECT_TRUE(IsPathInUse(path));
 354     EXPECT_TRUE(IsPathInUse(uniquified_path));
 355     EXPECT_EQ(uniquified_path.value(), reserved_path2.value());
 356     SetDownloadItemState(item2.get(), DownloadItem::COMPLETE);
 357   }
 358   message_loop_.RunUntilIdle();
 359
 360   // Now acquire an overwriting reservation. We should end up with the same
 361   // non-uniquified path for both reservations.
 362   scoped_ptr<MockDownloadItem> item3(CreateDownloadItem(2));
 363   base::FilePath reserved_path3;
 364   conflict_action = DownloadPathReservationTracker::OVERWRITE;
 365   CallGetReservedPath(
 366       item3.get(),
 367       path,
 368       create_directory,
 369       conflict_action,
 370       &reserved_path3,
 371       &verified);
 372   EXPECT_TRUE(IsPathInUse(path));
 373   EXPECT_FALSE(IsPathInUse(uniquified_path));
 374
 375   EXPECT_EQ(path.value(), reserved_path1.value());
 376   EXPECT_EQ(path.value(), reserved_path3.value());
 377
 378   SetDownloadItemState(item1.get(), DownloadItem::COMPLETE);
 379   SetDownloadItemState(item3.get(), DownloadItem::COMPLETE);
 380 }
 381
 382 // If a unique path cannot be determined after trying kMaxUniqueFiles
 383 // uniquifiers, then the callback should notified that verification failed, and
 384 // the returned path should be set to the original requested path.
 385 TEST_F(DownloadPathReservationTrackerTest, UnresolvedConflicts) {
 386   base::FilePath path(
 387       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 388   scoped_ptr<MockDownloadItem>
 389       items[DownloadPathReservationTracker::kMaxUniqueFiles + 1];
 390   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 391     DownloadPathReservationTracker::UNIQUIFY;
 392   bool create_directory = false;
 393
 394   // Create |kMaxUniqueFiles + 1| reservations for |path|. The first reservation
 395   // will have no uniquifier. The |kMaxUniqueFiles| remaining reservations do.
 396   for (int i = 0; i <= DownloadPathReservationTracker::kMaxUniqueFiles; i++) {
 397     base::FilePath reserved_path;
 398     base::FilePath expected_path;
 399     bool verified = false;
 400     if (i > 0) {
 401       expected_path =
 402           path.InsertBeforeExtensionASCII(base::StringPrintf(" (%d)", i));
 403     } else {
 404       expected_path = path;
 405     }
 406     items[i].reset(CreateDownloadItem(i));
 407     EXPECT_FALSE(IsPathInUse(expected_path));
 408     CallGetReservedPath(
 409         items[i].get(),
 410         path,
 411         create_directory,
 412         conflict_action,
 413         &reserved_path,
 414         &verified);
 415     EXPECT_TRUE(IsPathInUse(expected_path));
 416     EXPECT_EQ(expected_path.value(), reserved_path.value());
 417     EXPECT_TRUE(verified);
 418   }
 419   // The next reservation for |path| will fail to be unique.
 420   scoped_ptr<MockDownloadItem> item(
 421       CreateDownloadItem(DownloadPathReservationTracker::kMaxUniqueFiles + 1));
 422   base::FilePath reserved_path;
 423   bool verified = true;
 424   CallGetReservedPath(
 425       item.get(),
 426       path,
 427       create_directory,
 428       conflict_action,
 429       &reserved_path,
 430       &verified);
 431   EXPECT_FALSE(verified);
 432   EXPECT_EQ(path.value(), reserved_path.value());
 433
 434   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 435   for (int i = 0; i <= DownloadPathReservationTracker::kMaxUniqueFiles; i++)
 436     SetDownloadItemState(items[i].get(), DownloadItem::COMPLETE);
 437 }
 438
 439 // If the target directory is unwriteable, then callback should be notified that
 440 // verification failed.
 441 TEST_F(DownloadPathReservationTrackerTest, UnwriteableDirectory) {
 442   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 443   base::FilePath path(
 444       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 445   base::FilePath dir(path.DirName());
 446   ASSERT_FALSE(IsPathInUse(path));
 447
 448   {
 449     // Scope for FilePermissionRestorer
 450     base::FilePermissionRestorer restorer(dir);
 451     EXPECT_TRUE(base::MakeFileUnwritable(dir));
 452     base::FilePath reserved_path;
 453     bool verified = true;
 454     DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 455       DownloadPathReservationTracker::OVERWRITE;
 456     bool create_directory = false;
 457     CallGetReservedPath(
 458         item.get(),
 459         path,
 460         create_directory,
 461         conflict_action,
 462         &reserved_path,
 463         &verified);
 464     // Verification fails.
 465     EXPECT_FALSE(verified);
 466     EXPECT_EQ(path.BaseName().value(), reserved_path.BaseName().value());
 467   }
 468   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 469 }
 470
 471 // If the default download directory doesn't exist, then it should be
 472 // created. But only if we are actually going to create the download path there.
 473 TEST_F(DownloadPathReservationTrackerTest, CreateDefaultDownloadPath) {
 474   base::FilePath path(
 475       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo/foo.txt")));
 476   base::FilePath dir(path.DirName());
 477   ASSERT_FALSE(base::DirectoryExists(dir));
 478   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 479     DownloadPathReservationTracker::OVERWRITE;
 480   bool create_directory = false;
 481
 482   {
 483     scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 484     base::FilePath reserved_path;
 485     bool verified = true;
 486     CallGetReservedPath(
 487         item.get(),
 488         path,
 489         create_directory,
 490         conflict_action,
 491         &reserved_path,
 492         &verified);
 493     // Verification fails because the directory doesn't exist.
 494     EXPECT_FALSE(verified);
 495     SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 496   }
 497   ASSERT_FALSE(IsPathInUse(path));
 498   {
 499     scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 500     base::FilePath reserved_path;
 501     bool verified = true;
 502     set_default_download_path(dir);
 503     CallGetReservedPath(
 504         item.get(),
 505         path,
 506         create_directory,
 507         conflict_action,
 508         &reserved_path,
 509         &verified);
 510     // Verification succeeds because the directory is created.
 511     EXPECT_TRUE(verified);
 512     EXPECT_TRUE(base::DirectoryExists(dir));
 513     SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 514   }
 515 }
 516
 517 // If the target path of the download item changes, the reservation should be
 518 // updated to match.
 519 TEST_F(DownloadPathReservationTrackerTest, UpdatesToTargetPath) {
 520   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 521   base::FilePath path(
 522       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo.txt")));
 523   ASSERT_FALSE(IsPathInUse(path));
 524
 525   base::FilePath reserved_path;
 526   bool verified = false;
 527   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 528     DownloadPathReservationTracker::OVERWRITE;
 529   bool create_directory = false;
 530   CallGetReservedPath(
 531       item.get(),
 532       path,
 533       create_directory,
 534       conflict_action,
 535       &reserved_path,
 536       &verified);
 537   EXPECT_TRUE(IsPathInUse(path));
 538   EXPECT_TRUE(verified);
 539   EXPECT_EQ(path.value(), reserved_path.value());
 540
 541   // The target path is initially empty. If an OnDownloadUpdated() is issued in
 542   // this state, we shouldn't lose the reservation.
 543   ASSERT_EQ(base::FilePath::StringType(), item->GetTargetFilePath().value());
 544   item->NotifyObserversDownloadUpdated();
 545   message_loop_.RunUntilIdle();
 546   EXPECT_TRUE(IsPathInUse(path));
 547
 548   // If the target path changes, we should update the reservation to match.
 549   base::FilePath new_target_path(
 550       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("bar.txt")));
 551   ASSERT_FALSE(IsPathInUse(new_target_path));
 552   EXPECT_CALL(*item, GetTargetFilePath())
 553       .WillRepeatedly(ReturnRef(new_target_path));
 554   item->NotifyObserversDownloadUpdated();
 555   message_loop_.RunUntilIdle();
 556   EXPECT_FALSE(IsPathInUse(path));
 557   EXPECT_TRUE(IsPathInUse(new_target_path));
 558
 559   // Destroying the item should release the reservation.
 560   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 561   item.reset();
 562   message_loop_.RunUntilIdle();
 563   EXPECT_FALSE(IsPathInUse(new_target_path));
 564 }
 565
 566 // Tests for long name truncation. On other platforms automatic truncation
 567 // is not performed (yet).
 568 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_CHROMEOS)
 569
 570 TEST_F(DownloadPathReservationTrackerTest, BasicTruncation) {
 571   int real_max_length =
 572       base::GetMaximumPathComponentLength(default_download_path());
 573   ASSERT_NE(-1, real_max_length);
 574
 575   // TODO(kinaba): the current implementation leaves spaces for appending
 576   // ".crdownload". So take it into account. Should be removed in the future.
 577   const size_t max_length = real_max_length - 11;
 578
 579   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 580   base::FilePath path(GetLongNamePathInDownloadsDirectory(
 581       max_length, FILE_PATH_LITERAL(".txt")));
 582   ASSERT_FALSE(IsPathInUse(path));
 583
 584   base::FilePath reserved_path;
 585   bool verified = false;
 586   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 587     DownloadPathReservationTracker::OVERWRITE;
 588   bool create_directory = false;
 589   CallGetReservedPath(
 590       item.get(),
 591       path,
 592       create_directory,
 593       conflict_action,
 594       &reserved_path,
 595       &verified);
 596   EXPECT_TRUE(IsPathInUse(reserved_path));
 597   EXPECT_TRUE(verified);
 598   // The file name length is truncated to max_length.
 599   EXPECT_EQ(max_length, reserved_path.BaseName().value().size());
 600   // But the extension is kept unchanged.
 601   EXPECT_EQ(path.Extension(), reserved_path.Extension());
 602   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 603 }
 604
 605 TEST_F(DownloadPathReservationTrackerTest, TruncationConflict) {
 606   int real_max_length =
 607       base::GetMaximumPathComponentLength(default_download_path());
 608   ASSERT_NE(-1, real_max_length);
 609   const size_t max_length = real_max_length - 11;
 610
 611   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 612   base::FilePath path(GetLongNamePathInDownloadsDirectory(
 613       max_length, FILE_PATH_LITERAL(".txt")));
 614   base::FilePath path0(GetLongNamePathInDownloadsDirectory(
 615       max_length - 4, FILE_PATH_LITERAL(".txt")));
 616   base::FilePath path1(GetLongNamePathInDownloadsDirectory(
 617       max_length - 8, FILE_PATH_LITERAL(" (1).txt")));
 618   base::FilePath path2(GetLongNamePathInDownloadsDirectory(
 619       max_length - 8, FILE_PATH_LITERAL(" (2).txt")));
 620   ASSERT_FALSE(IsPathInUse(path));
 621   // "aaa...aaaaaaa.txt" (truncated path) and
 622   // "aaa...aaa (1).txt" (truncated and first uniquification try) exists.
 623   // "aaa...aaa (2).txt" should be used.
 624   ASSERT_EQ(0, base::WriteFile(path0, "", 0));
 625   ASSERT_EQ(0, base::WriteFile(path1, "", 0));
 626
 627   base::FilePath reserved_path;
 628   bool verified = false;
 629   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 630     DownloadPathReservationTracker::UNIQUIFY;
 631   bool create_directory = false;
 632   CallGetReservedPath(
 633       item.get(),
 634       path,
 635       create_directory,
 636       conflict_action,
 637       &reserved_path,
 638       &verified);
 639   EXPECT_TRUE(IsPathInUse(reserved_path));
 640   EXPECT_TRUE(verified);
 641   EXPECT_EQ(path2, reserved_path);
 642   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 643 }
 644
 645 TEST_F(DownloadPathReservationTrackerTest, TruncationFail) {
 646   int real_max_length =
 647       base::GetMaximumPathComponentLength(default_download_path());
 648   ASSERT_NE(-1, real_max_length);
 649   const size_t max_length = real_max_length - 11;
 650
 651   scoped_ptr<MockDownloadItem> item(CreateDownloadItem(1));
 652   base::FilePath path(GetPathInDownloadsDirectory(
 653       (FILE_PATH_LITERAL("a.") +
 654           base::FilePath::StringType(max_length, 'b')).c_str()));
 655   ASSERT_FALSE(IsPathInUse(path));
 656
 657   base::FilePath reserved_path;
 658   bool verified = false;
 659   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
 660     DownloadPathReservationTracker::OVERWRITE;
 661   bool create_directory = false;
 662   CallGetReservedPath(
 663       item.get(),
 664       path,
 665       create_directory,
 666       conflict_action,
 667       &reserved_path,
 668       &verified);
 669   // We cannot truncate a path with very long extension.
 670   EXPECT_FALSE(verified);
 671   SetDownloadItemState(item.get(), DownloadItem::COMPLETE);
 672 }
 673
 674 #endif