util: Add API to enumerate Logger modules

Change-Id: Ie1361b76305b4de9746e769212efa7b381c59f91
Refs: #4013
diff --git a/tests/unit-tests/util/logging.t.cpp b/tests/unit-tests/util/logging.t.cpp
index f47b5a9..3447968 100644
--- a/tests/unit-tests/util/logging.t.cpp
+++ b/tests/unit-tests/util/logging.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2013-2016 Regents of the University of California.
+ * Copyright (c) 2013-2017 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -30,6 +30,8 @@
 namespace util {
 namespace tests {
 
+NDN_LOG_INIT(ndn.util.tests.Logging);
+
 using namespace ndn::tests;
 using boost::test_tools::output_test_stream;
 
@@ -90,6 +92,14 @@
 BOOST_AUTO_TEST_SUITE(Util)
 BOOST_FIXTURE_TEST_SUITE(TestLogging, LoggingFixture)
 
+BOOST_AUTO_TEST_CASE(GetLoggerNames)
+{
+  NDN_LOG_TRACE("GetLoggerNames"); // to avoid unused function warning
+  std::set<std::string> names = Logging::getLoggerNames();
+  BOOST_CHECK_GT(names.size(), 0);
+  BOOST_CHECK_EQUAL(names.count("ndn.util.tests.Logging"), 1);
+}
+
 BOOST_AUTO_TEST_SUITE(Severity)
 
 BOOST_AUTO_TEST_CASE(None)