diff --git a/.gitignore b/.gitignore
index 8e60979..35ee2b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,11 +1,13 @@
+/.idea/
+
+/backup/
+/env/
+/tmp/
+
 *.pyc
 *.mo
-.coverage
-geckodriver.log
+/.coverage
+/.tox/
+/geckodriver.log
 
-.idea/
-django_dav_events.egg-info/
-
-backup/
-env/
-tmp/
+/django_dav_events.egg-info/
diff --git a/.pylintrc b/.pylintrc
new file mode 100644
index 0000000..752daa2
--- /dev/null
+++ b/.pylintrc
@@ -0,0 +1,27 @@
+[MASTER]
+
+persistent=no
+load-plugins=pylint_django
+
+
+[MESSAGES CONTROL]
+
+disable=missing-docstring,
+        missing-module-docstring,
+        missing-class-docstring,
+        missing-function-docstring,
+        useless-object-inheritance,
+
+[BASIC]
+
+good-names=_,
+           c,
+           d,
+           e,
+           i,
+           j,
+           k,
+
+[FORMAT]
+
+max-line-length=120
diff --git a/dav_base/tests/utils.py b/dav_base/tests/utils.py
index cd8727b..92bf16e 100644
--- a/dav_base/tests/utils.py
+++ b/dav_base/tests/utils.py
@@ -1,12 +1,13 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 import os
-from tempfile import mkdtemp as _mkdtmp
+from tempfile import mkdtemp as _mkdtemp
 
 
 def mkdtemp(prefix):
     dirname = os.path.dirname
     pkg_base_dir = dirname(dirname(dirname(__file__)))
     tmp_dir = os.path.join(pkg_base_dir, 'tmp')
-    os.makedirs(tmp_dir, exist_ok=True)
-    return _mkdtmp(prefix=prefix, dir=tmp_dir)
+    if not os.path.exists(tmp_dir):
+        os.makedirs(tmp_dir)
+    return _mkdtemp(prefix=prefix, dir=tmp_dir)
diff --git a/setup.py b/setup.py
index ea83d53..31a0ef1 100644
--- a/setup.py
+++ b/setup.py
@@ -118,7 +118,7 @@ setup(
         'babel',
         'django >= 1.11, < 2.0',
         'django-extensions',
-        'django-bootstrap3',
+        'django-bootstrap3 < 12',
         'django-countries',
         'django-datetime-widget',
         'pytz',
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..f23d041
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,7 @@
+[tox]
+envlist = py3,py2
+
+[testenv]
+commands = python --version
+           python -m coverage run setup.py test
+           coverage report --skip-covered