diff --git a/tests/core/event-emitter.cpp b/tests/core/event-emitter.cpp
index c44b6d2..b6ee048 100644
--- a/tests/core/event-emitter.cpp
+++ b/tests/core/event-emitter.cpp
@@ -6,9 +6,12 @@
 
 #include "core/event-emitter.hpp"
 
-#include <boost/test/unit_test.hpp>
+#include "tests/test-common.hpp"
 
 namespace nfd {
+namespace tests {
+
+BOOST_FIXTURE_TEST_SUITE(UtilEventEmitter, BaseFixture)
 
 class EventEmitterTester : noncopyable
 {
@@ -117,8 +120,6 @@
 EventEmitterTest_RefObject_byRef(const EventEmitterTest_RefObject& a1) {}
 
 
-BOOST_AUTO_TEST_SUITE(UtilEventEmitter)
-
 BOOST_AUTO_TEST_CASE(ZeroListener)
 {
   EventEmitter<> ee;
@@ -228,4 +229,5 @@
 
 BOOST_AUTO_TEST_SUITE_END()
 
+} // namespace tests
 } // namespace nfd
diff --git a/tests/core/limited-io.cpp b/tests/core/limited-io.cpp
index 5752685..ea19585 100644
--- a/tests/core/limited-io.cpp
+++ b/tests/core/limited-io.cpp
@@ -7,6 +7,7 @@
 #include "limited-io.hpp"
 
 namespace nfd {
+namespace tests {
 
 const int LimitedIo::UNLIMITED_OPS = std::numeric_limits<int>::max();
 const time::Duration LimitedIo::UNLIMITED_TIME = time::nanoseconds(-1);
@@ -15,7 +16,6 @@
   : m_isRunning(false)
   , m_nOpsRemaining(0)
 {
-  resetGlobalIoService();
 }
 
 LimitedIo::StopReason
@@ -55,4 +55,5 @@
   getGlobalIoService().stop();
 }
 
+} // namespace tests
 } // namespace nfd
diff --git a/tests/core/limited-io.hpp b/tests/core/limited-io.hpp
index 14dadd7..7fb4f70 100644
--- a/tests/core/limited-io.hpp
+++ b/tests/core/limited-io.hpp
@@ -10,6 +10,7 @@
 #include "core/scheduler.hpp"
 
 namespace nfd {
+namespace tests {
 
 class LimitedIo
 {
@@ -44,6 +45,7 @@
   StopReason m_reason;
 };
 
+} // namespace tests
 } // namespace nfd
 
 #endif // NFD_TEST_CORE_LIMITED_IO_HPP
diff --git a/tests/core/logger.cpp b/tests/core/logger.cpp
index 6694ece..0530dcc 100644
--- a/tests/core/logger.cpp
+++ b/tests/core/logger.cpp
@@ -10,12 +10,14 @@
 #include <boost/test/unit_test.hpp>
 #include <iostream>
 
+#include "tests/test-common.hpp"
 
 namespace nfd {
+namespace tests {
 
-BOOST_AUTO_TEST_SUITE(CoreLogger)
+BOOST_FIXTURE_TEST_SUITE(CoreLogger, BaseFixture)
 
-struct LoggerFixture
+struct LoggerFixture : protected BaseFixture
 {
   LoggerFixture()
     : m_savedBuf(std::cerr.rdbuf())
@@ -151,4 +153,5 @@
 
 BOOST_AUTO_TEST_SUITE_END()
 
+} // namespace tests
 } // namespace nfd
diff --git a/tests/core/scheduler.cpp b/tests/core/scheduler.cpp
index d6b51fa..806c982 100644
--- a/tests/core/scheduler.cpp
+++ b/tests/core/scheduler.cpp
@@ -6,13 +6,14 @@
 
 #include "core/scheduler.hpp"
 
-#include <boost/test/unit_test.hpp>
+#include "tests/test-common.hpp"
 
 namespace nfd {
+namespace tests {
 
-BOOST_AUTO_TEST_SUITE(CoreScheduler)
+BOOST_FIXTURE_TEST_SUITE(CoreScheduler, BaseFixture)
 
-struct SchedulerFixture
+struct SchedulerFixture : protected BaseFixture
 {
   SchedulerFixture()
     : count1(0)
@@ -56,8 +57,6 @@
 
 BOOST_FIXTURE_TEST_CASE(Events, SchedulerFixture)
 {
-  resetGlobalIoService();
-
   scheduler::schedule(time::seconds(0.5), bind(&SchedulerFixture::event1, this));
 
   EventId i = scheduler::schedule(time::seconds(1.0), bind(&SchedulerFixture::event2, this));
@@ -72,7 +71,7 @@
   i = scheduler::getGlobalScheduler().schedulePeriodicEvent(time::seconds(0.3), time::seconds(0.1), bind(&SchedulerFixture::event4, this));
   scheduler::schedule(time::seconds(1), bind(&scheduler::cancel, i));
 
-  getGlobalIoService().run();
+  g_io.run();
 
   BOOST_CHECK_EQUAL(count1, 1);
   BOOST_CHECK_EQUAL(count2, 0);
@@ -86,7 +85,7 @@
   scheduler::cancel(i);
 }
 
-struct SelfCancelFixture
+struct SelfCancelFixture : protected BaseFixture
 {
   void
   cancelSelf()
@@ -99,14 +98,13 @@
 
 BOOST_FIXTURE_TEST_CASE(SelfCancel, SelfCancelFixture)
 {
-  resetGlobalIoService();
-
   m_selfEventId = scheduler::schedule(time::seconds(0.1),
                                       bind(&SelfCancelFixture::cancelSelf, this));
 
-  BOOST_REQUIRE_NO_THROW(getGlobalIoService().run());
+  BOOST_REQUIRE_NO_THROW(g_io.run());
 }
 
 BOOST_AUTO_TEST_SUITE_END()
 
+} // namespace tests
 } // namespace nfd