diff --git a/setup.cfg b/setup.cfg
index bebae22..59a8a03 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,6 +30,7 @@ test =
     setuptools>=38.0
     codecov
     twine
+    pyinstaller
 
 [flake8]
     max-line-length = 100
diff --git a/tests/test_command_list_split.py b/tests/test_command_list_split.py
index de8b9b2..a14a1e0 100644
--- a/tests/test_command_list_split.py
+++ b/tests/test_command_list_split.py
@@ -20,7 +20,7 @@ PEXPECT LICENSE
 '''
 import wexpect
 import unittest
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 class TestCaseSplitCommandLine(PexpectTestCase.PexpectTestCase):
     def test_split_sizes(self):
diff --git a/tests/test_console_reader.py b/tests/test_console_reader.py
index b823e2c..84890e5 100644
--- a/tests/test_console_reader.py
+++ b/tests/test_console_reader.py
@@ -33,7 +33,7 @@ import unittest
 import win32process
 import win32api
 import os
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 
 if "RUN_CONSOLE_READER_TEST" not in os.environ:
diff --git a/tests/test_constructor.py b/tests/test_constructor.py
index 01ceb3a..f8d74f2 100644
--- a/tests/test_constructor.py
+++ b/tests/test_constructor.py
@@ -21,7 +21,7 @@ PEXPECT LICENSE
 import wexpect
 import unittest
 import time
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 class TestCaseConstructor(PexpectTestCase.PexpectTestCase):
     def test_constructor (self):
diff --git a/tests/test_delay.py b/tests/test_delay.py
index 05c775c..62a2c25 100644
--- a/tests/test_delay.py
+++ b/tests/test_delay.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from . import PexpectTestCase
+from tests import PexpectTestCase
 import wexpect
 
 
diff --git a/tests/test_destructor.py b/tests/test_destructor.py
index 46a4d81..2a6a773 100644
--- a/tests/test_destructor.py
+++ b/tests/test_destructor.py
@@ -20,7 +20,7 @@ PEXPECT LICENSE
 '''
 import wexpect
 import unittest
-from . import PexpectTestCase
+from tests import PexpectTestCase
 import gc
 import platform
 import time
diff --git a/tests/test_echo.py b/tests/test_echo.py
index 46f2bba..9bd0db1 100644
--- a/tests/test_echo.py
+++ b/tests/test_echo.py
@@ -20,7 +20,7 @@ PEXPECT LICENSE
 '''
 import wexpect
 import unittest
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 class EchoTestCase(PexpectTestCase.PexpectTestCase):
     def testPath(self):
diff --git a/tests/test_expect.py b/tests/test_expect.py
index e2dd69a..d1b0180 100644
--- a/tests/test_expect.py
+++ b/tests/test_expect.py
@@ -27,7 +27,7 @@ import sys
 import os
 
 import wexpect
-from . import PexpectTestCase
+from tests import PexpectTestCase
 from .utils import no_coverage_env
 
 # Many of these test cases blindly assume that sequential directory
diff --git a/tests/test_interact.py b/tests/test_interact.py
index 5b86e22..d07f30b 100644
--- a/tests/test_interact.py
+++ b/tests/test_interact.py
@@ -30,7 +30,7 @@ SOFTWARE.
 import wexpect
 import time
 import unittest
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 class InteractTestCase(PexpectTestCase.PexpectTestCase):
 
diff --git a/tests/test_isalive.py b/tests/test_isalive.py
index 8308793..33284fe 100644
--- a/tests/test_isalive.py
+++ b/tests/test_isalive.py
@@ -23,7 +23,7 @@ import unittest
 import signal
 import sys
 import time
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 PYBIN = '"{}"'.format(sys.executable)
 
diff --git a/tests/test_long.py b/tests/test_long.py
index a5e7425..9464315 100644
--- a/tests/test_long.py
+++ b/tests/test_long.py
@@ -22,7 +22,7 @@ import wexpect
 import unittest
 import sys
 import os
-from . import PexpectTestCase
+from tests import PexpectTestCase
 from . import long_printer
 
 puskas_wiki = long_printer.puskas_wiki
diff --git a/tests/test_misc.py b/tests/test_misc.py
index 5519c41..47b39b5 100644
--- a/tests/test_misc.py
+++ b/tests/test_misc.py
@@ -25,7 +25,7 @@ import os
 import time
 
 import wexpect
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 # the program cat(1) may display ^D\x08\x08 when \x04 (EOF, Ctrl-D) is sent
 _CAT_EOF = '^D\x08\x08'
diff --git a/tests/test_readline.py b/tests/test_readline.py
index 583dc8c..1686f11 100644
--- a/tests/test_readline.py
+++ b/tests/test_readline.py
@@ -31,7 +31,7 @@ import time
 import sys
 import os
 import unittest
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 here = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(0, here)
diff --git a/tests/test_run.py b/tests/test_run.py
index 276faac..7a123e6 100644
--- a/tests/test_run.py
+++ b/tests/test_run.py
@@ -26,7 +26,7 @@ import tempfile
 import sys
 import os
 import re
-from . import PexpectTestCase
+from tests import PexpectTestCase
 
 unicode_type = str
 
diff --git a/tox.ini b/tox.ini
index 31908bd..bda1e48 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@
 
 [tox]
 # The following configuration will run automatically.
-envlist = py{37}-{default,legacy_wexpect,spawn_pipe}
+envlist = py{37}-{default,legacy_wexpect,spawn_pipe},installed
 
 [testenv]
 description = Unit tests
@@ -34,7 +34,7 @@ commands =
 # normal tests test the cloned files. This testenv tests the installation itself.
 description = Unit tests installed
 
-changedir = test_installed_01
+changedir = test_01_installed
 
 # Appveyor will set the WEXPECT_SPAWN_CLASS to run the proper configuration for each run.
 passenv =