58   TestMessageQueue queue;  in TEST_F()  local
60   queue.SendMessage(EmptyMessage{});  in TEST_F()
61   ASSERT_TRUE(std::holds_alternative<EmptyMessage>(queue.ReceiveMessage()));  in TEST_F()
63   queue.SendMessage(IntMessage{42});  in TEST_F()
64   ASSERT_TRUE(std::holds_alternative<IntMessage>(queue.ReceiveMessage()));  in TEST_F()
66   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
67   ASSERT_TRUE(std::holds_alternative<OtherIntMessage>(queue.ReceiveMessage()));  in TEST_F()
69   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
70   ASSERT_TRUE(std::holds_alternative<TwoIntMessage>(queue.ReceiveMessage()));  in TEST_F()
72   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
73   ASSERT_TRUE(std::holds_alternative<StringMessage>(queue.ReceiveMessage()));  in TEST_F()
77   TestMessageQueue queue;  in TEST_F()  local
82   queue.SetTimeout(kDuration);  in TEST_F()
83   ASSERT_TRUE(std::holds_alternative<TimeoutExpiredMessage>(queue.ReceiveMessage()));  in TEST_F()
110   TestMessageQueue queue;  in TEST_F()  local
112   queue.SendMessage(EmptyMessage{});  in TEST_F()
113   queue.SendMessage(IntMessage{42});  in TEST_F()
114   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
115   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
116   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
117   queue.SetTimeout(500);  in TEST_F()
128     queue.SwitchReceive(  in TEST_F()
167   TestMessageQueue queue;  in TEST_F()  local
169   queue.SendMessage(EmptyMessage{});  in TEST_F()
170   queue.SendMessage(IntMessage{42});  in TEST_F()
171   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
172   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
173   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
174   queue.SetTimeout(500);  in TEST_F()
179     queue.SwitchReceive([&]([[maybe_unused]] auto message) { pending_messages--; });  in TEST_F()
184   TestMessageQueue queue;  in TEST_F()  local
186   queue.SendMessage(EmptyMessage{});  in TEST_F()
187   queue.SendMessage(IntMessage{42});  in TEST_F()
188   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
189   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
190   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
191   queue.SetTimeout(500);  in TEST_F()
195     queue.SwitchReceive(  in TEST_F()
208   TestMessageQueue queue;  in TEST_F()  local
210   queue.SendMessage(EmptyMessage{});  in TEST_F()
213       queue.SwitchReceive<bool>([&]([[maybe_unused]] const EmptyMessage& message) { return true; },  in TEST_F()
216   queue.SendMessage(IntMessage{42});  in TEST_F()
219       queue.SwitchReceive<bool>([&]([[maybe_unused]] const EmptyMessage& message) { return true; },  in TEST_F()
224   TestMessageQueue queue;  in TEST_F()  local
236     queue.SendMessage(message);  in TEST_F()
238   queue.SetTimeout(500);  in TEST_F()
245     auto message = queue.ReceiveMessage();  in TEST_F()
257     ASSERT_TRUE(std::holds_alternative<TimeoutExpiredMessage>(queue.ReceiveMessage()));  in TEST_F()