logging

tests/RenderCadenceCompositorLoggerTests.cpp

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+#include "Logger.h"
+
+#include <chrono>
+#include <iostream>
+#include <string>
+#include <thread>
+
+namespace
+{
+int gFailures = 0;
+
+void Expect(bool condition, const std::string& message)
+{
+	if (condition)
+		return;
+
+	++gFailures;
+	std::cerr << "FAILED: " << message << "\n";
+}
+
+void TestLevelNames()
+{
+	using namespace RenderCadenceCompositor;
+	Expect(std::string(LogLevelName(LogLevel::Log)) == "log", "log level name");
+	Expect(std::string(LogLevelName(LogLevel::Warning)) == "warning", "warning level name");
+	Expect(std::string(LogLevelName(LogLevel::Error)) == "error", "error level name");
+}
+
+void TestLevelFiltering()
+{
+	using namespace RenderCadenceCompositor;
+
+	LoggerConfig config;
+	config.minimumLevel = LogLevel::Warning;
+	config.writeToConsole = false;
+	config.writeToDebugOutput = false;
+	config.writeToFile = false;
+	config.maxQueuedMessages = 16;
+
+	Logger& logger = Logger::Instance();
+	logger.Start(config);
+	logger.Write(LogLevel::Log, "test", "filtered");
+	logger.Write(LogLevel::Warning, "test", "kept");
+	logger.Write(LogLevel::Error, "test", "kept");
+	logger.Stop();
+
+	const LoggerCounters counters = logger.Counters();
+	Expect(counters.queued == 2, "logger queues only messages at or above minimum level");
+	Expect(counters.written == 2, "logger writes queued messages before stop returns");
+	Expect(counters.dropped == 0, "logger does not drop under queue capacity");
+}
+
+void TestTryWriteDropsWhenQueueIsFull()
+{
+	using namespace RenderCadenceCompositor;
+
+	LoggerConfig config;
+	config.minimumLevel = LogLevel::Log;
+	config.writeToConsole = false;
+	config.writeToDebugOutput = false;
+	config.writeToFile = false;
+	config.maxQueuedMessages = 0;
+
+	Logger& logger = Logger::Instance();
+	logger.Start(config);
+
+	const bool sawDrop = !logger.TryWrite(LogLevel::Log, "test", "message");
+	logger.Stop();
+
+	Expect(sawDrop || logger.Counters().dropped > 0, "try-write reports or counts queue pressure");
+}
+}
+
+int main()
+{
+	TestLevelNames();
+	TestLevelFiltering();
+	TestTryWriteDropsWhenQueueIsFull();
+
+	if (gFailures != 0)
+	{
+		std::cerr << gFailures << " RenderCadenceCompositorLogger test failure(s).\n";
+		return 1;
+	}
+
+	std::cout << "RenderCadenceCompositorLogger tests passed.\n";
+	return 0;
+}