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+// Copyright 2014 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 MOJO_SERVICES_VIEW_MANAGER_TEST_CHANGE_TRACKER_H_
+#define MOJO_SERVICES_VIEW_MANAGER_TEST_CHANGE_TRACKER_H_
+
+#include <string>
+#include <vector>
+
+#include "mojo/public/cpp/bindings/array.h"
+#include "mojo/services/public/cpp/view_manager/types.h"
+#include "mojo/services/public/interfaces/view_manager/view_manager.mojom.h"
+#include "ui/gfx/rect.h"
+
+namespace mojo {
+namespace view_manager {
+namespace service {
+
+enum ChangeType {
+  CHANGE_TYPE_CONNECTION_ESTABLISHED,
+  CHANGE_TYPE_ROOTS_ADDED,
+  CHANGE_TYPE_SERVER_CHANGE_ID_ADVANCED,
+  CHANGE_TYPE_NODE_BOUNDS_CHANGED,
+  CHANGE_TYPE_NODE_HIERARCHY_CHANGED,
+  CHANGE_TYPE_NODE_REORDERED,
+  CHANGE_TYPE_NODE_DELETED,
+  CHANGE_TYPE_VIEW_DELETED,
+  CHANGE_TYPE_VIEW_REPLACED,
+  CHANGE_TYPE_INPUT_EVENT,
+};
+
+// TODO(sky): consider nuking and converting directly to NodeData.
+struct TestNode {
+  // Returns a string description of this.
+  std::string ToString() const;
+
+  Id parent_id;
+  Id node_id;
+  Id view_id;
+};
+
+// Tracks a call to ViewManagerClient. See the individual functions for the
+// fields that are used.
+struct Change {
+  Change();
+  ~Change();
+
+  ChangeType type;
+  ConnectionSpecificId connection_id;
+  Id change_id;
+  std::vector<TestNode> nodes;
+  Id node_id;
+  Id node_id2;
+  Id node_id3;
+  Id view_id;
+  Id view_id2;
+  gfx::Rect bounds;
+  gfx::Rect bounds2;
+  int32 event_action;
+  String creator_url;
+  OrderDirection direction;
+};
+
+// Converts Changes to string descriptions.
+std::vector<std::string> ChangesToDescription1(
+    const std::vector<Change>& changes);
+
+// Returns a string description of |changes[0].nodes|. Returns an empty string
+// if change.size() != 1.
+std::string ChangeNodeDescription(const std::vector<Change>& changes);
+
+// Converts NodeDatas to TestNodes.
+void NodeDatasToTestNodes(const Array<NodeDataPtr>& data,
+                          std::vector<TestNode>* test_nodes);
+
+// TestChangeTracker is used to record ViewManagerClient functions. It notifies
+// a delegate any time a change is added.
+class TestChangeTracker {
+ public:
+  // Used to notify the delegate when a change is added. A change corresponds to
+  // a single ViewManagerClient function.
+  class Delegate {
+   public:
+    virtual void OnChangeAdded() = 0;
+
+   protected:
+    virtual ~Delegate() {}
+  };
+
+  TestChangeTracker();
+  ~TestChangeTracker();
+
+  void set_delegate(Delegate* delegate) { delegate_ = delegate; }
+
+  std::vector<Change>* changes() { return &changes_; }
+
+  // Each of these functions generate a Change. There is one per
+  // ViewManagerClient function.
+  void OnViewManagerConnectionEstablished(ConnectionSpecificId connection_id,
+                                          const String& creator_url,
+                                          Id next_server_change_id,
+                                          Array<NodeDataPtr> nodes);
+  void OnRootsAdded(Array<NodeDataPtr> nodes);
+  void OnServerChangeIdAdvanced(Id change_id);
+  void OnNodeBoundsChanged(Id node_id, RectPtr old_bounds, RectPtr new_bounds);
+  void OnNodeHierarchyChanged(Id node_id,
+                              Id new_parent_id,
+                              Id old_parent_id,
+                              Id server_change_id,
+                              Array<NodeDataPtr> nodes);
+  void OnNodeReordered(Id node_id,
+                       Id relative_node_id,
+                       OrderDirection direction,
+                       Id server_change_id);
+  void OnNodeDeleted(Id node_id, Id server_change_id);
+  void OnViewDeleted(Id view_id);
+  void OnNodeViewReplaced(Id node_id, Id new_view_id, Id old_view_id);
+  void OnViewInputEvent(Id view_id, EventPtr event);
+
+ private:
+  void AddChange(const Change& change);
+
+  Delegate* delegate_;
+  std::vector<Change> changes_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestChangeTracker);
+};
+
+}  // namespace service
+}  // namespace view_manager
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_VIEW_MANAGER_TEST_CHANGE_TRACKER_H_