test: testable eventbus

Author: AndyTWF

include/mock/SdkMock.h

@@ -1,5 +1,7 @@
 #pragma once
+#include "../../src/eventbus/InternalEventBusFactory.h"
 #include "ECFMP/Sdk.h"
+#include "ECFMP/eventbus/EventBus.h"
 #include <gmock/gmock.h>
 
 namespace ECFMP::Mock::Plugin {
@@ -13,8 +15,20 @@ namespace ECFMP::Mock::Plugin {
         );
         MOCK_METHOD(std::shared_ptr<const Api::EventCollection>, Events, (), (const, noexcept, override));
         MOCK_METHOD(std::shared_ptr<const Api::FlowMeasureCollection>, FlowMeasures, (), (const, noexcept, override));
-        MOCK_METHOD(ECFMP::EventBus::EventBus&, EventBus, (), (const, noexcept, override));
+
+        [[nodiscard]] auto EventBus() const noexcept -> ECFMP::EventBus::EventBus& override
+        {
+            if (!eventBus) {
+                eventBus = ECFMP::EventBus::MakeEventBus();
+            }
+
+            return *eventBus;
+        }
+
         MOCK_METHOD(void, OnEuroscopeTimerTick, (), (noexcept, override));
         MOCK_METHOD(void, Destroy, (), (noexcept, override));
+
+        private:
+        mutable std::shared_ptr<EventBus::EventBus> eventBus;
     };
 }// namespace ECFMP::Mock::Plugin