Flesh out URLLoader's download_to_file function....

webkit/blob/deletable_file_reference_unittest.cc

+// Copyright (c) 2010 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 "webkit/blob/deletable_file_reference.h"
+
+#include "base/file_util.h"
+#include "base/message_loop.h"
+#include "base/message_loop_proxy.h"
+#include "base/scoped_temp_dir.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace webkit_blob {
+
+TEST(DeletableFileReferenceTest, TestReferences) {
+  scoped_refptr<base::MessageLoopProxy> loop_proxy =
+      base::MessageLoopProxy::CreateForCurrentThread();
+  ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+
+  // Create a file.
+  FilePath file;
+  file_util::CreateTemporaryFileInDir(temp_dir.path(), &file);
+  EXPECT_TRUE(file_util::PathExists(file));
+
+  // Create a first reference to that file.
+  scoped_refptr<DeletableFileReference> reference1;
+  reference1 = DeletableFileReference::Get(file);
+  EXPECT_FALSE(reference1.get());
+  reference1 = DeletableFileReference::GetOrCreate(file, loop_proxy);
+  EXPECT_TRUE(reference1.get());
+  EXPECT_TRUE(file == reference1->path());
+
+  // Get a second reference to that file.
+  scoped_refptr<DeletableFileReference> reference2;
+  reference2 = DeletableFileReference::Get(file);
+  EXPECT_EQ(reference1.get(), reference2.get());
+  reference2 = DeletableFileReference::GetOrCreate(file, loop_proxy);
+  EXPECT_EQ(reference1.get(), reference2.get());
+
+  // Drop the first reference, the file and reference should still be there.
+  reference1 = NULL;
+  EXPECT_TRUE(DeletableFileReference::Get(file).get());
+  MessageLoop::current()->RunAllPending();
+  EXPECT_TRUE(file_util::PathExists(file));
+
+  // Drop the second reference, the file and reference should get deleted.
+  reference2 = NULL;
+  EXPECT_FALSE(DeletableFileReference::Get(file).get());
+  MessageLoop::current()->RunAllPending();
+  EXPECT_FALSE(file_util::PathExists(file));
+}
+
+}  // namespace webkit_blob