Add test to ensure config loading impacts runtime log level

test/util/test_llarp_util_log_level.cpp

@@ -1,5 +1,7 @@
 #include <gtest/gtest.h>
 #include <util/logging/loglevel.hpp>
+#include <util/logging/logger.hpp>
+#include <config/config.hpp>
 
 using TestString = std::string;
 
@@ -61,3 +63,36 @@ TEST_F(LogLevelTest, TestLogLevelToString)
   EXPECT_EQ("???", LogLevelToString(llarp::eLogNone));
 }
 
+TEST_F(LogLevelTest, TestLoggingConfigSideEffects)
+{
+  // restore original runtime level when we're done
+  llarp::LogContext& logContext = llarp::LogContext::Instance();
+  auto original = logContext.runtimeLevel;
+
+  // LoggingConfig::fromSection updates the runtime level as it reads in conf
+  // values, so feed it values and ensure that the runtime level is updated
+  // appropriately
+  llarp::LoggingConfig config;
+
+  config.fromSection("level", "Trace");
+  EXPECT_EQ(llarp::eLogTrace, logContext.runtimeLevel);
+
+  config.fromSection("level", "Debug");
+  EXPECT_EQ(llarp::eLogDebug, logContext.runtimeLevel);
+
+  config.fromSection("level", "Info");
+  EXPECT_EQ(llarp::eLogInfo, logContext.runtimeLevel);
+
+  config.fromSection("level", "Warn");
+  EXPECT_EQ(llarp::eLogWarn, logContext.runtimeLevel);
+
+  config.fromSection("level", "Error");
+  EXPECT_EQ(llarp::eLogError, logContext.runtimeLevel);
+
+  config.fromSection("level", "None");
+  EXPECT_EQ(llarp::eLogNone, logContext.runtimeLevel);
+
+
+  SetLogLevel(original);
+}
+