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

[cbentzel, 2012/02/24 01:54:37]

Should this be in the content namespace?

[ahendrickson, 2012/02/24 22:48:39]

Done.

+  FILE_OPERATION_INITIALIZE,
+  FILE_OPERATION_WRITE,
+  FILE_OPERATION_RENAME
+};
+
+// Test helper for injecting errors into DownloadFile operations.
+// Must only be used on the FILE thread.

[cbentzel, 2012/02/24 02:25:12]

Comment not entirely true - constructor can be called off of FILE thread.

[ahendrickson, 2012/02/24 22:48:39]

Changed the comment.

+class TestFileErrorInjector
+    : public base::RefCountedThreadSafe<TestFileErrorInjector> {

[cbentzel, 2012/02/24 02:25:12]

Why does this need to be refcounted?

[ahendrickson, 2012/02/24 22:48:39]

Because the DownloadFileWithError instances can outlast the test body, which is
where TestFileErrorInjected would normally be destroyed.

However, if I remove the capability of injecting errors after the DownloadFile
has been created, then this is no longer necessary.

Changed.

+ public:
+  TestFileErrorInjector() {}
+
+  static TestFileErrorInjector* Create();
+
+  virtual bool InjectError(int file_index,

[cbentzel, 2012/02/24 02:25:12]

Could this be simplified at all - especially since |file_index| is always 0?

[ahendrickson, 2012/02/24 22:48:39]

I would like to be able to use this later, for auto-resume cases.  Each resume
creates a new DownloadFile, so I will need indices other than 0.

+                           FileOperationCode operation,
+                           int operation_instance,
+                           net::Error net_error) = 0;
+
+  virtual size_t CurrentFileCount() const = 0;
+  virtual size_t FileCreationCount() const = 0;
+
+ protected:
+  // Here so we can derive from this class.
+  virtual ~TestFileErrorInjector() {}
+
+ private:
+  friend class base::RefCountedThreadSafe<TestFileErrorInjector>;
+
+  DISALLOW_COPY_AND_ASSIGN(TestFileErrorInjector);
+};
+
+#endif  // CONTENT_TEST_TEST_FILE_ERROR_INJECTOR_H_