[SafeBrowsing] Block dangerous unchecked downloads based on a Finch trial.

chrome/browser/file_select_helper_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/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/path_service.h"
@@ skipping 60 matching lines @@
   size_t file_count = arraysize(files_to_verify);
   for (size_t i = 0; i < file_count; i++) {
     const char* relative_path = files_to_verify[i];
     base::FilePath orig_file = src.Append(relative_path);
     base::FilePath final_file =
         temp_dir.path().Append(app_name).Append(relative_path);
     EXPECT_TRUE(base::ContentsEqual(orig_file, final_file));
   }
 }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
+TEST_F(FileSelectHelperTest, GetSanitizedFileName) {
+  // The empty path should be preserved.
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("")),
+            FileSelectHelper::GetSanitizedFileName(base::FilePath()));
+
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("ascii.txt")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("ascii.txt"))));
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("trailing-spaces-")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("trailing-spaces "))));
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("path-components-in-name")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("path/components/in/name"))));
+
+// The following test expectations assume that the tests run with the locale
+// set to en-us. Chrome unit_tests are initialized to use en-us.
+#if defined(OS_WIN)
+  // Invalid UTF-16
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("download")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("\ud801\udc37\udc17"))));
+#else
+  // Invalid UTF-8
+  EXPECT_EQ(base::FilePath(FILE_PATH_LITERAL("download")),
+            FileSelectHelper::GetSanitizedFileName(
+                base::FilePath(FILE_PATH_LITERAL("\xe3\x81\x81\x81\x82"))));
+#endif
+}