make tests auto terminate

framework/engine/src/mm/services/count_down.hpp

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <mm/engine.hpp>
+
+namespace MM::Services {
+
+// counts X times and stops engine
+// useful for automatic testing
+class CountDown : public Service {
+	public:
+		CountDown(int64_t start) : _counter(start) {}
+
+		const char* name(void) override { return "CountDown"; }
+
+		bool enable(Engine&, std::vector<UpdateStrategies::TaskInfo>& task_array) override {
+			// add task
+			task_array.push_back(
+				UpdateStrategies::TaskInfo{"CountDown::tick"}
+				.phase(UpdateStrategies::update_phase_t::POST)
+				.fn([this](Engine& e) { this->tick(e); })
+			);
+
+			return true;
+		}
+
+		void disable(Engine&) override {}
+
+	private:
+
+		void tick(Engine& engine) {
+			_counter--;
+			if (_counter == 0) {
+				engine.stop();
+			}
+		}
+
+	private:
+		int64_t _counter = 0;
+
+};
+
+} // MM::Services
+