Configure logging for testutil (#128)

Signed-off-by: Dmitriy Khaustov aka xDimon <khaustov.dm@gmail.com>

src/log/configurator.cpp

@@ -39,7 +39,6 @@ groups:
           - name: tls
           - name: listener_manager
           - name: libp2p_debug
-            level: trace
 # --------------- End of libp2p config ---------------)");
   }
 

test/testutil/prepare_loggers.hpp

@@ -18,8 +18,13 @@ namespace testutil {
 
   void prepareLoggers(soralog::Level level = soralog::Level::INFO) {
     std::call_once(initialized, [] {
-
-      auto configurator = std::make_shared<soralog::ConfiguratorFromYAML>(std::string(R"(
+      // This is configuration part of logging system for using in tests.
+      // 1. It adds synchronous sink to console
+      // 2. Switches root group to them
+      // 3. Sets verbosity to info level
+      // 4. Add special group for tests
+      auto testing_log_config = std::string(R"(
+# ---- Begin of logging system config addon ----
 sinks:
   - name: console
     type: console
@@ -29,18 +34,23 @@ sinks:
 groups:
   - name: libp2p
     sink: console
-    level: off
-  - name: libp2p_debug
-    level: trace
-)"));
+    level: info
+    children:
+      - name: testing
+# ----- End of logging system config addon -----
+)");
 
-      auto logging_system =
-          std::make_shared<soralog::LoggingSystem>(configurator);
+      auto logging_system = std::make_shared<soralog::LoggingSystem>(
+          std::make_shared<soralog::ConfiguratorFromYAML>(
+              // Original LibP2P logging config
+              std::make_shared<libp2p::log::Configurator>(),
+              // Additional logging config for testing
+              testing_log_config));
 
       auto r = logging_system->configure();
       if (r.has_error) {
         std::cerr << r.message << std::endl;
-        exit(EXIT_FAILURE);
+        throw std::runtime_error("Can't configure logger system");
       }
 
       libp2p::log::setLoggingSystem(logging_system);