diff --git a/.ci/build-manylinux-wheels.sh b/.ci/build-manylinux-wheels.sh
index 18f47a0..49f7c61 100755
--- a/.ci/build-manylinux-wheels.sh
+++ b/.ci/build-manylinux-wheels.sh
@@ -8,7 +8,7 @@ PIP="/opt/python/${PYTHON_VERSION}/bin/pip"
 ${PIP} install --upgrade pip wheel
 ${PIP} install --upgrade setuptools
 ${PIP} install -r /io/.ci/requirements.txt
-make -C /io/ PYTHON="${PYTHON}"
+make -C /io/ PYTHON="${PYTHON}" clean compile
 ${PIP} wheel /io/ -w /io/dist/
 
 # Bundle external shared libraries into the wheels.
@@ -21,5 +21,5 @@ PYTHON="/opt/python/${PYTHON_VERSION}/bin/python"
 PIP="/opt/python/${PYTHON_VERSION}/bin/pip"
 ${PIP} install ${PYMODULE} --no-index -f file:///io/dist
 rm -rf /io/tests/__pycache__
-make -C /io/ PYTHON="${PYTHON}" test
+make -C /io/ PYTHON="${PYTHON}" testinstalled
 rm -rf /io/tests/__pycache__
diff --git a/.ci/travis-build-wheels.sh b/.ci/travis-build-wheels.sh
index 8150c7c..c1d9b77 100755
--- a/.ci/travis-build-wheels.sh
+++ b/.ci/travis-build-wheels.sh
@@ -62,7 +62,7 @@ elif [ "${TRAVIS_OS_NAME}" == "osx" ]; then
 
     pip install ${PYMODULE} --no-index -f "file:///${_root}/dist"
     pushd / >/dev/null
-    make -C "${_root}" test
+    make -C "${_root}" testinstalled
     popd >/dev/null
 
     _upload_wheels
diff --git a/.travis.yml b/.travis.yml
index 07fe061..aae27de 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -50,7 +50,7 @@ matrix:
           dist: trusty
           sudo: false
           language: python
-          python: "3.6-dev"
+          python: "3.6"
           env: BUILD=tests
 
         - os: linux
diff --git a/Makefile b/Makefile
index e894a95..20eadcf 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: _default clean clean-libuv distclean compile debug docs test release
+.PHONY: _default clean clean-libuv distclean compile debug docs test testinstalled release
 
 
 PYTHON ?= python
@@ -9,7 +9,7 @@ _default: compile
 
 clean:
 	rm -fr dist/ doc/_build/ *.egg-info uvloop/loop.*.pyd
-	rm -fr build/lib.* build/temp.*
+	rm -fr build/lib.* build/temp.* build/libuv
 	rm -fr uvloop/*.c uvloop/*.html uvloop/*.so
 	rm -fr uvloop/handles/*.html uvloop/includes/*.html
 	find . -name '__pycache__' | xargs rm -rf
@@ -44,5 +44,9 @@ test:
 	$(PYTHON) setup.py test
 
 
+testinstalled:
+	$(PYTHON) tests/__init__.py
+
+
 release: distclean compile test
 	$(PYTHON) setup.py sdist bdist_wheel upload
diff --git a/tests/__init__.py b/tests/__init__.py
index 51eccca..0f18e3f 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,7 +1,17 @@
+import os.path
+import sys
 import unittest
+import unittest.runner
 
 
 def suite():
     test_loader = unittest.TestLoader()
-    test_suite = test_loader.discover('.', pattern='test_*.py')
+    test_suite = test_loader.discover(
+        os.path.dirname(__file__), pattern='test_*.py')
     return test_suite
+
+
+if __name__ == '__main__':
+    runner = unittest.runner.TextTestRunner()
+    result = runner.run(suite())
+    sys.exit(not result.wasSuccessful())
diff --git a/tests/test_tcp.py b/tests/test_tcp.py
index b323a3a..08d4eb6 100644
--- a/tests/test_tcp.py
+++ b/tests/test_tcp.py
@@ -842,6 +842,9 @@ class Test_AIO_TCP(_TestTCP, tb.AIOTestCase):
 
 class _TestSSL(tb.SSLTestCase):
 
+    ONLYCERT = tb._cert_fullname(__file__, 'ssl_cert.pem')
+    ONLYKEY = tb._cert_fullname(__file__, 'ssl_key.pem')
+
     def test_create_server_ssl_1(self):
         CNT = 0           # number of clients that were successful
         TOTAL_CNT = 25    # total number of clients that test will create
diff --git a/tests/test_unix.py b/tests/test_unix.py
index 2d39843..e76d0b0 100644
--- a/tests/test_unix.py
+++ b/tests/test_unix.py
@@ -420,6 +420,9 @@ class Test_AIO_Unix(_TestUnix, tb.AIOTestCase):
 
 class _TestSSL(tb.SSLTestCase):
 
+    ONLYCERT = tb._cert_fullname(__file__, 'ssl_cert.pem')
+    ONLYKEY = tb._cert_fullname(__file__, 'ssl_key.pem')
+
     def test_create_unix_server_ssl_1(self):
         CNT = 0           # number of clients that were successful
         TOTAL_CNT = 25    # total number of clients that test will create
diff --git a/uvloop/_testbase.py b/uvloop/_testbase.py
index 6ae9220..2607160 100644
--- a/uvloop/_testbase.py
+++ b/uvloop/_testbase.py
@@ -133,10 +133,10 @@ class BaseTestCase(unittest.TestCase, metaclass=BaseTestCaseMeta):
     def skip_unclosed_handles_check(self):
         self._check_unclosed_resources_in_debug = False
 
-def _cert_fullname(name):
-    fullname = os.path.join(
-        os.path.dirname(os.path.dirname(__file__)),
-        'tests', 'certs', name)
+
+def _cert_fullname(test_file_name, cert_file_name):
+    fullname = os.path.abspath(os.path.join(
+        os.path.dirname(test_file_name), 'certs', cert_file_name))
     assert os.path.isfile(fullname)
     return fullname
 
@@ -173,9 +173,6 @@ def find_free_port(start_from=50000):
 
 class SSLTestCase:
 
-    ONLYCERT = _cert_fullname('ssl_cert.pem')
-    ONLYKEY = _cert_fullname('ssl_key.pem')
-
     def _create_server_ssl_context(self, certfile, keyfile=None):
         sslcontext = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
         sslcontext.options |= ssl.OP_NO_SSLv2