52   TestMessageQueue queue;  in TEST_F()  local
54   queue.SendMessage(EmptyMessage{});  in TEST_F()
55   ASSERT_TRUE(std::holds_alternative<EmptyMessage>(queue.ReceiveMessage()));  in TEST_F()
57   queue.SendMessage(IntMessage{42});  in TEST_F()
58   ASSERT_TRUE(std::holds_alternative<IntMessage>(queue.ReceiveMessage()));  in TEST_F()
60   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
61   ASSERT_TRUE(std::holds_alternative<OtherIntMessage>(queue.ReceiveMessage()));  in TEST_F()
63   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
64   ASSERT_TRUE(std::holds_alternative<TwoIntMessage>(queue.ReceiveMessage()));  in TEST_F()
66   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
67   ASSERT_TRUE(std::holds_alternative<StringMessage>(queue.ReceiveMessage()));  in TEST_F()
71   TestMessageQueue queue;  in TEST_F()  local
76   queue.SetTimeout(kDuration);  in TEST_F()
77   ASSERT_TRUE(std::holds_alternative<TimeoutExpiredMessage>(queue.ReceiveMessage()));  in TEST_F()
102   TestMessageQueue queue;  in TEST_F()  local
104   queue.SendMessage(EmptyMessage{});  in TEST_F()
105   queue.SendMessage(IntMessage{42});  in TEST_F()
106   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
107   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
108   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
109   queue.SetTimeout(500);  in TEST_F()
120     queue.SwitchReceive(  in TEST_F()
159   TestMessageQueue queue;  in TEST_F()  local
161   queue.SendMessage(EmptyMessage{});  in TEST_F()
162   queue.SendMessage(IntMessage{42});  in TEST_F()
163   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
164   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
165   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
166   queue.SetTimeout(500);  in TEST_F()
171     queue.SwitchReceive([&]([[maybe_unused]] auto message) { pending_messages--; });  in TEST_F()
176   TestMessageQueue queue;  in TEST_F()  local
178   queue.SendMessage(EmptyMessage{});  in TEST_F()
179   queue.SendMessage(IntMessage{42});  in TEST_F()
180   queue.SendMessage(OtherIntMessage{43});  in TEST_F()
181   queue.SendMessage(TwoIntMessage{1, 2});  in TEST_F()
182   queue.SendMessage(StringMessage{"Hello, World!"});  in TEST_F()
183   queue.SetTimeout(500);  in TEST_F()
187     queue.SwitchReceive(  in TEST_F()
200   TestMessageQueue queue;  in TEST_F()  local
202   queue.SendMessage(EmptyMessage{});  in TEST_F()
205       queue.SwitchReceive<bool>([&]([[maybe_unused]] const EmptyMessage& message) { return true; },  in TEST_F()
208   queue.SendMessage(IntMessage{42});  in TEST_F()
211       queue.SwitchReceive<bool>([&]([[maybe_unused]] const EmptyMessage& message) { return true; },  in TEST_F()
216   TestMessageQueue queue;  in TEST_F()  local
228     queue.SendMessage(message);  in TEST_F()
230   queue.SetTimeout(500);  in TEST_F()
237     auto message = queue.ReceiveMessage();  in TEST_F()
249     ASSERT_TRUE(std::holds_alternative<TimeoutExpiredMessage>(queue.ReceiveMessage()));  in TEST_F()