tests: use LimitedIo API for time or IO limits

Change-Id: Id5cc1cea9bf1329e730d92c4099e80adbfc0f500
diff --git a/tests/core/limited-io.cpp b/tests/core/limited-io.cpp
index ea19585..b381696 100644
--- a/tests/core/limited-io.cpp
+++ b/tests/core/limited-io.cpp
@@ -5,10 +5,13 @@
  */
 
 #include "limited-io.hpp"
+#include "core/logger.hpp"
 
 namespace nfd {
 namespace tests {
 
+NFD_LOG_INIT("LimitedIo");
+
 const int LimitedIo::UNLIMITED_OPS = std::numeric_limits<int>::max();
 const time::Duration LimitedIo::UNLIMITED_TIME = time::nanoseconds(-1);
 
@@ -30,7 +33,14 @@
     m_timeout = scheduler::schedule(nTimeLimit, bind(&LimitedIo::afterTimeout, this));
   }
   
-  getGlobalIoService().run();
+  try {
+    getGlobalIoService().run();
+  }
+  catch (std::exception& ex) {
+    m_reason = EXCEPTION;
+    NFD_LOG_ERROR("g_io.run() exception: " << ex.what());
+    m_lastException = ex;
+  }
   
   getGlobalIoService().reset();
   scheduler::cancel(m_timeout);
@@ -55,5 +65,11 @@
   getGlobalIoService().stop();
 }
 
+const std::exception&
+LimitedIo::getLastException() const
+{
+  return m_lastException;
+}
+
 } // namespace tests
 } // namespace nfd