feat: add event bus tests

tests/engine/event_bus_test.cpp

@@ -0,0 +1,76 @@
+#include <cassert>
+#include <engine/core/engine_bus.hpp>
+
+const std::string testEventName = "TestEvent";
+int calls = 0;
+
+class TestEvent : public MscEvent
+{
+public:
+    std::string getName() const override
+    {
+        return testEventName;
+    }
+};
+
+/// @brief Проверка на работу pub-sub
+void testEventPubSub()
+{
+    calls = 0;
+    MscEventBus bus;
+    TestEvent event;
+
+    bus.subscribe(testEventName, [&](MscEvent &ev)
+                  {
+                    calls++;
+
+                    auto *testEvent = dynamic_cast<TestEvent*>(&ev);
+                    assert(testEvent != nullptr); });
+
+    bus.publish(event);
+    assert(calls == 1);
+}
+
+/// @brief Проверка на работу
+void testEventOnce()
+{
+    calls = 0;
+    MscEventBus bus;
+    TestEvent event;
+
+    bus.subscribeOnce(testEventName, [&](MscEvent &)
+                      { calls++; });
+
+    bus.publish(event);
+    bus.publish(event);
+    assert(calls == 1);
+}
+
+/// @brief Проверка работы отписки
+void testUnsubscribe()
+{
+    calls = 0;
+    MscEventBus bus;
+    TestEvent event;
+
+    auto id = bus.subscribe(testEventName, [&](MscEvent &)
+                            { calls++; });
+
+    bus.publish(event);
+
+    assert(bus.unsubscribe(id) == true);
+    assert(bus.unsubscribe(id) == false);
+
+    bus.publish(event);
+
+    assert(calls == 1);
+}
+
+int main()
+{
+    testEventPubSub();
+    testEventOnce();
+    testUnsubscribe();
+
+    return 0;
+}