[Chromoting] Add a filter that will stop the host sending unnecessary clipboard events to the clien…

remoting/protocol/clipboard_echo_filter_unittest.cc

Index: remoting/protocol/clipboard_echo_filter_unittest.cc
diff --git a/remoting/protocol/clipboard_echo_filter_unittest.cc b/remoting/protocol/clipboard_echo_filter_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..25f5de101d645b5142a9318a922468f31670a037
--- /dev/null
+++ b/remoting/protocol/clipboard_echo_filter_unittest.cc
@@ -0,0 +1,111 @@
+// 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/protocol/clipboard_echo_filter.h"
+
+#include "remoting/proto/event.pb.h"
+#include "remoting/protocol/protocol_mock_objects.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::_;
+using ::testing::InSequence;
+
+namespace remoting {
+namespace protocol {
+
+MATCHER_P2(EqualsClipboardEvent, mime_type, data, "") {
+  return arg.mime_type() == mime_type && arg.data() == data;
+}
+
+static ClipboardEvent MakeClipboardEvent(const std::string& mime_type,
+                                  const std::string& data) {
+  ClipboardEvent event;
+  event.set_mime_type(mime_type);
+  event.set_data(data);
+  return event;
+}
+
+// Check that the filter only filters out events identical to the latest
+// clipboard item from the client.
+TEST(ClipboardEchoFilterTest, FromClientBlocksIdenticalEventToClient) {
+  MockClipboardStub client_stub;
+  MockClipboardStub host_stub;
+
+  {
+    InSequence s;
+    EXPECT_CALL(host_stub,
+                InjectClipboardEvent(EqualsClipboardEvent("text", "a")));
+    EXPECT_CALL(host_stub,
+                InjectClipboardEvent(EqualsClipboardEvent("text", "b")));
+    EXPECT_CALL(client_stub,
+                InjectClipboardEvent(EqualsClipboardEvent("text", "a")));
+    EXPECT_CALL(host_stub,
+                InjectClipboardEvent(EqualsClipboardEvent("image", "a")));
+    EXPECT_CALL(client_stub,
+                InjectClipboardEvent(EqualsClipboardEvent("text", "a")));
+  }
+
+  ClipboardEchoFilter filter;
+  filter.set_client_stub(&client_stub);
+  filter.set_host_stub(&host_stub);
+
+  filter.host_filter()->InjectClipboardEvent(
+      MakeClipboardEvent("text", "a"));
+  // The client has sent ("text", "a") to the host, so make sure the filter
+  // will stop the host echoing that item back to the client.
+  filter.client_filter()->InjectClipboardEvent(
+      MakeClipboardEvent("text", "a"));
+  filter.host_filter()->InjectClipboardEvent(
+      MakeClipboardEvent("text", "b"));
+  filter.client_filter()->InjectClipboardEvent(
+      MakeClipboardEvent("text", "a"));
+  filter.host_filter()->InjectClipboardEvent(
+      MakeClipboardEvent("image", "a"));
+  filter.client_filter()->InjectClipboardEvent(
+      MakeClipboardEvent("text", "a"));
+}
+
+// Check that the filter will drop events sent to the host, if there is no host
+// stub, whether or not there is a client stub.
+TEST(ClipboardEchoFilterTest, NoHostStub) {
+  MockClipboardStub client_stub;
+  MockClipboardStub host_stub;
+
+  EXPECT_CALL(host_stub,
+              InjectClipboardEvent(EqualsClipboardEvent("text", "a")));
+
+  ClipboardEchoFilter filter;
+  ClipboardEvent event = MakeClipboardEvent("text", "a");
+  filter.host_filter()->InjectClipboardEvent(event);
+
+  filter.set_client_stub(&client_stub);
+  filter.host_filter()->InjectClipboardEvent(event);
+
+  filter.set_host_stub(&host_stub);
+  filter.host_filter()->InjectClipboardEvent(event);
+}
+
+// Check that the filter will drop events sent to the client, if there is no
+// client stub, whether or not there is a host stub.
+TEST(ClipboardEchoFilter, NoClientStub) {
+  MockClipboardStub client_stub;
+  MockClipboardStub host_stub;
+
+  EXPECT_CALL(client_stub,
+              InjectClipboardEvent(EqualsClipboardEvent("text", "a")));
+
+  ClipboardEchoFilter filter;
+  ClipboardEvent event = MakeClipboardEvent("text", "a");
+  filter.client_filter()->InjectClipboardEvent(event);
+
+  filter.set_host_stub(&host_stub);
+  filter.client_filter()->InjectClipboardEvent(event);
+
+  filter.set_client_stub(&client_stub);
+  filter.client_filter()->InjectClipboardEvent(event);
+}
+
+}  // namespace protocol
+}  // namespace remoting