Enable "Hide Extension" option when "Save Link As" on the Mac

content/browser/download/file_metadata_unittest_mac.mm

Index: content/browser/download/file_metadata_unittest_mac.mm
diff --git a/content/browser/download/file_metadata_unittest_mac.mm b/content/browser/download/file_metadata_unittest_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..af89e0b638766d92e8b1f168a364d0442527c661
--- /dev/null
+++ b/content/browser/download/file_metadata_unittest_mac.mm
@@ -0,0 +1,56 @@
+// Copyright 2015 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 <Foundation/Foundation.h>
+
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/files/scoped_temp_dir.h"
+#include "content/browser/download/file_metadata_mac.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+namespace {
+
+class FileMetadataMacTest : public testing::Test {
+ public:
+  FileMetadataMacTest() {};
+
+  const base::FilePath& test_file() const {
+    return test_file_;
+  }
+
+protected:
+  void SetUp() override {
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+    ASSERT_TRUE(base::CreateTemporaryFileInDir(temp_dir_.path(), &test_file_));
+  }
+
+private:
+  base::ScopedTempDir temp_dir_;
+  base::FilePath test_file_;
+};
+
+TEST_F(FileMetadataMacTest, CheckSetExtensionHiddenForFile) {
+  NSString* file_path =
+      [NSString stringWithUTF8String:test_file().value().c_str()];
+  content::SetExtensionHiddenForFile(test_file(), true);
+  NSError* error = nil;
+  NSDictionary* attributes =
+      [[NSFileManager defaultManager] attributesOfItemAtPath:file_path
+                                                       error:&error];
+  bool file_extension_hidden =
+      [[attributes objectForKey:NSFileExtensionHidden] boolValue];
+  EXPECT_TRUE(!error && file_extension_hidden);
+  content::SetExtensionHiddenForFile(test_file(), false);
+  error = nil;
+  attributes = [[NSFileManager defaultManager] attributesOfItemAtPath:file_path
+                                                                error:&error];
+  file_extension_hidden =
+      [[attributes objectForKey:NSFileExtensionHidden] boolValue];
+  EXPECT_TRUE(!error && !file_extension_hidden);
+}
+
+}  // namespace
+}  // namespace content