Moved code implementing message-only windows to a dedicated class (Windows only).

remoting/host/win/message_window_unittest.cc

+// 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.
+
+#include "remoting/host/win/message_window.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+
+namespace {
+
+class MessageWindowDelegate : public win::MessageWindow::Delegate {
+ public:
+  MessageWindowDelegate();
+  virtual ~MessageWindowDelegate();
+
+  // MessageWindow::Delegate interface.
+  virtual bool HandleMessage(HWND hwnd,
+                             UINT message,
+                             WPARAM wparam,
+                             LPARAM lparam,
+                             LRESULT* result) OVERRIDE;
+};
+
+MessageWindowDelegate::MessageWindowDelegate() {
+}
+
+MessageWindowDelegate::~MessageWindowDelegate() {
+}
+
+bool MessageWindowDelegate::HandleMessage(
+    HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam, LRESULT* result) {
+  // Return |wparam| as the result of WM_USER message.
+  if (message == WM_USER) {
+    *result = wparam;
+    return true;
+  }
+
+  return false;
+}
+
+}  // namespace
+
+// Checks that a window can be created.
+TEST(MessageWindowTest, Create) {
+  MessageWindowDelegate delegate;
+  win::MessageWindow window;
+  EXPECT_TRUE(window.Create(&delegate));
+}
+
+// Verifies that the created window can receive messages.
+TEST(MessageWindowTest, SendMessage) {
+  MessageWindowDelegate delegate;
+  win::MessageWindow window;
+  EXPECT_TRUE(window.Create(&delegate));
+
+  EXPECT_EQ(SendMessage(window.hwnd(), WM_USER, 100, 0), 100);
+}
+
+}  // namespace remoting