Test file errors in downloads.

content/test/test_file_error_injector.h

+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_TEST_TEST_FILE_ERROR_INJECTOR_H_
+#define CONTENT_TEST_TEST_FILE_ERROR_INJECTOR_H_
+#pragma once
+
+#include "base/memory/ref_counted.h"

[cbentzel, 2012/02/27 02:18:54]

ref_counted no longer needed.

[ahendrickson, 2012/02/28 03:28:56]

It is again.

+#include "net/base/net_errors.h"
+
+namespace content {
+
+enum FileOperationCode {

[cbentzel, 2012/02/27 02:18:54]

This seems pretty generic to be part of content namespace. Perhaps contain in
TestFileErrorInjector.

[ahendrickson, 2012/02/28 03:28:56]

Done.

+  FILE_OPERATION_INITIALIZE,
+  FILE_OPERATION_WRITE,
+  FILE_OPERATION_RENAME
+};
+
+// Test helper for injecting errors into |DownloadFile| operations.
+// All errors must be injected before |DownloadFile|s are created.

[cbentzel, 2012/02/27 02:18:54]

It might be clearer to have the API be like 

TestFileErrorInjector()
AddError();
AddError();
Inject()

Inject would actually create the DownloadFileErrorManager and inject into the
DownloadFileManager.

[ahendrickson, 2012/02/28 03:28:56]

Done.

+// Any other operations must occur on the FILE thread.
+// Will be owned by the |DownloadFileManager| via a |DownloadFileFactory|

[cbentzel, 2012/02/27 02:18:54]

Yeah - this ownership is still really strange - especially because it's hidden. 

[ahendrickson, 2012/02/28 03:28:56]

Switched to using RefCountedThreadSafe for the injector.

+// instance.
+class TestFileErrorInjector {
+ public:
+  TestFileErrorInjector() {}
+  virtual ~TestFileErrorInjector() {}
+
+  static TestFileErrorInjector* Create();
+
+  virtual bool InjectError(int file_index,
+                           FileOperationCode operation,
+                           int operation_instance,
+                           net::Error net_error) = 0;
+
+  virtual size_t CurrentFileCount() const = 0;
+  virtual size_t FileCreationCount() const = 0;
+  virtual bool HasFile(int file_index) const = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestFileErrorInjector);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_TEST_FILE_ERROR_INJECTOR_H_