diff --git a/.gitignore b/.gitignore
index d487b7e..8ac2af1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,6 @@ chromedriver_installer.egg-info/
 *.pyc
 MANIFEST
 .cache/
+venv/
+.pytest_cache/
+__pycache__/
diff --git a/requirements.txt b/requirements.txt
index b654c22..642edbd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
+pytest
 tox
\ No newline at end of file
diff --git a/tests.py b/tests.py
index 9690787..e026aa9 100644
--- a/tests.py
+++ b/tests.py
@@ -60,7 +60,7 @@ class Base(object):
     def _uninstall(self):
         try:
             subprocess.check_call(
-                shlex.split('pip uninstall chromedriver_installer -y')
+                self._get_popen_args('pip uninstall chromedriver_installer -y')
             )
         except subprocess.CalledProcessError:
             pass
@@ -78,7 +78,13 @@ def teardown(self):
 
     def _not_available(self):
         with pytest.raises(OSError):
-            subprocess.check_call(shlex.split('chromedriver --version'))
+            subprocess.check_call(self._get_popen_args('chromedriver --version'))
+
+    def _get_popen_args(self, command):
+        if os.name == 'posix':
+            return self._get_popen_args(command, posix=os.name == 'posix')
+        else:
+            return command
 
 
 class TestFailure(Base):
@@ -91,7 +97,7 @@ def test_bad_checksum(self):
         )
 
         error_message = subprocess.Popen(
-            shlex.split(command),
+            self._get_popen_args(command),
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
         ).communicate()[0]
@@ -120,11 +126,11 @@ def _test_version(self, version, cached):
         self._assert_cached_files_exist(cached, remove=not cached)
 
         # After installation...
-        subprocess.check_call(shlex.split(self._get_install_command()))
+        subprocess.check_call(self._get_popen_args(self._get_install_command()))
 
         # ...the chromedriver executable should be available...
         expected_version, error = subprocess.Popen(
-            shlex.split('chromedriver -v'),
+            self._get_popen_args('chromedriver -v'),
             stdout=subprocess.PIPE
         ).communicate()
 
diff --git a/tox.ini b/tox.ini
index d496ece..a61f164 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,6 @@ envlist=py27, py36
 
 [testenv]
 skip_install=True
-deps=
-    pytest
+deps = -rrequirements.txt
 commands=
-    py.test -vv tests.py
+    py.test -vv tests.py {posargs}