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diff --git a/src/type3_AndroidCloud/anbox-master/external/android-emugl/shared/emugl/common/message_channel_unittest.cpp b/src/type3_AndroidCloud/anbox-master/external/android-emugl/shared/emugl/common/message_channel_unittest.cpp
new file mode 100644
index 0000000..2e9d55e
--- /dev/null
+++ b/src/type3_AndroidCloud/anbox-master/external/android-emugl/shared/emugl/common/message_channel_unittest.cpp
@@ -0,0 +1,101 @@
+// Copyright 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "emugl/common/message_channel.h"
+
+#include "emugl/common/testing/test_thread.h"
+
+#include <gtest/gtest.h>
+
+#include <string>
+
+namespace emugl {
+
+namespace {
+
+struct PingPongState {
+    MessageChannel<std::string, 3U> in;
+    MessageChannel<std::string, 3U> out;
+};
+
+void* pingPongFunction(void* param) {
+    for (;;) {
+        PingPongState* s = static_cast<PingPongState*>(param);
+        std::string str;
+        s->in.receive(&str);
+        s->out.send(str);
+        if (str == "quit") {
+            break;
+        }
+    }
+    return 0;
+}
+
+}  // namespace
+
+TEST(MessageChannel, SingleThreadWithInt) {
+    MessageChannel<int, 3U> channel;
+    channel.send(1);
+    channel.send(2);
+    channel.send(3);
+
+    int ret;
+    channel.receive(&ret);
+    EXPECT_EQ(1, ret);
+    channel.receive(&ret);
+    EXPECT_EQ(2, ret);
+    channel.receive(&ret);
+    EXPECT_EQ(3, ret);
+}
+
+TEST(MessageChannel, SingleThreadWithStdString) {
+    MessageChannel<std::string, 5U> channel;
+    channel.send(std::string("foo"));
+    channel.send(std::string("bar"));
+    channel.send(std::string("zoo"));
+
+    std::string str;
+    channel.receive(&str);
+    EXPECT_STREQ("foo", str.c_str());
+    channel.receive(&str);
+    EXPECT_STREQ("bar", str.c_str());
+    channel.receive(&str);
+    EXPECT_STREQ("zoo", str.c_str());
+}
+
+TEST(MessageChannel, TwoThreadsPingPong) {
+    PingPongState state;
+    TestThread* thread = new TestThread(pingPongFunction, &state);
+
+    std::string str;
+    const size_t kCount = 100;
+    for (size_t n = 0; n < kCount; ++n) {
+        state.in.send(std::string("foo"));
+        state.in.send(std::string("bar"));
+        state.in.send(std::string("zoo"));
+        state.out.receive(&str);
+        EXPECT_STREQ("foo", str.c_str());
+        state.out.receive(&str);
+        EXPECT_STREQ("bar", str.c_str());
+        state.out.receive(&str);
+        EXPECT_STREQ("zoo", str.c_str());
+    }
+    state.in.send(std::string("quit"));
+    state.out.receive(&str);
+    EXPECT_STREQ("quit", str.c_str());
+
+    thread->join();
+}
+
+}  // namespace emugl