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diff --git a/sync/internal_api/public/test/test_user_share.h b/sync/internal_api/public/test/test_user_share.h
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+// 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.
+//
+// A handy class that takes care of setting up and destroying a
+// sync_api::UserShare instance for unit tests that require one.
+//
+// The expected usage is to make this a component of your test fixture:
+//
+//   class AwesomenessTest : public testing::Test {
+//    public:
+//     virtual void SetUp() {
+//       test_user_share_.SetUp();
+//     }
+//     virtual void TearDown() {
+//       test_user_share_.TearDown();
+//     }
+//    protected:
+//     TestUserShare test_user_share_;
+//   };
+//
+// Then, in your tests:
+//
+//   TEST_F(AwesomenessTest, IsMaximal) {
+//     sync_api::ReadTransaction trans(test_user_share_.user_share());
+//     ...
+//   }
+//
+
+#ifndef SYNC_INTERNAL_API_PUBLIC_TEST_TEST_USER_SHARE_H_
+#define SYNC_INTERNAL_API_PUBLIC_TEST_TEST_USER_SHARE_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "sync/internal_api/public/user_share.h"
+
+namespace browser_sync {
+
+class TestDirectorySetterUpper;
+
+class TestUserShare {
+ public:
+  TestUserShare();
+  ~TestUserShare();
+
+  // Sets up the UserShare instance.  Clears any existing database
+  // backing files that might exist on disk.
+  void SetUp();
+
+  // Undo everything done by SetUp(): closes the UserShare and deletes
+  // the backing files. Before closing the directory, this will run
+  // the directory invariant checks and perform the SaveChanges action
+  // on the user share's directory.
+  void TearDown();
+
+  // Non-NULL iff called between a call to SetUp() and TearDown().
+  sync_api::UserShare* user_share();
+
+ private:
+  scoped_ptr<TestDirectorySetterUpper> dir_maker_;
+  scoped_ptr<sync_api::UserShare> user_share_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestUserShare);
+};
+
+}  // namespace browser_sync
+
+#endif  // SYNC_INTERNAL_API_PUBLIC_TEST_TEST_USER_SHARE_H_