diff --git a/photo21/settings.py b/photo21/settings.py
index 7781ee6..097e5ec 100644
--- a/photo21/settings.py
+++ b/photo21/settings.py
@@ -12,6 +12,8 @@ https://docs.djangoproject.com/en/2.2/ref/settings/
 
 import os
 
+from django.utils.translation import gettext_lazy as _
+
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
@@ -121,7 +123,6 @@ USE_L10N = True
 USE_TZ = True
 
 # Limit available languages to this subset
-from django.utils.translation import gettext_lazy as _
 LANGUAGES = [
     ('de', _('German')),
     ('en', _('English')),
diff --git a/photo21/urls.py b/photo21/urls.py
index 0f960d9..c15ca5f 100644
--- a/photo21/urls.py
+++ b/photo21/urls.py
@@ -29,4 +29,4 @@ urlpatterns = [
 ]
 
 if settings.DEBUG:
-    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
\ No newline at end of file
+    urlpatterns += static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
diff --git a/photo21/views.py b/photo21/views.py
index eebf488..7ea9d2d 100644
--- a/photo21/views.py
+++ b/photo21/views.py
@@ -4,5 +4,6 @@
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.views.generic import TemplateView
 
+
 class IndexView(LoginRequiredMixin, TemplateView):
     template_name = "index.html"
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..e8869aa
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,54 @@
+[tox]
+envlist =
+    # Debian Buster Python
+    py37-django22
+
+    # Ubuntu 20.04 Python
+    py38-django22
+
+    # Debian Bullseye Python
+    py39-django22
+
+    linters
+skipsdist = True
+
+[testenv]
+sitepackages = True
+deps =
+    -r{toxinidir}/requirements.txt
+    coverage
+commands =
+    coverage run --omit='photo21/wsgi.py' --source=photo21 ./manage.py test
+    coverage report -m
+
+[testenv:linters]
+deps =
+    flake8
+    flake8-bugbear
+    flake8-colors
+    flake8-django
+    flake8-import-order
+    flake8-typing-imports
+    pep8-naming
+    pyflakes
+commands =
+    flake8 photo21
+
+[flake8]
+ignore = W503, I100, I101
+exclude =
+    .tox,
+    .git,
+    __pycache__,
+    build,
+    dist,
+    *.pyc,
+    *.egg-info,
+    .cache,
+    .eggs,
+    *migrations*
+max-complexity = 15
+max-line-length = 160
+import-order-style = google
+application-import-names = flake8
+format = ${cyan}%(path)s${reset}:${yellow_bold}%(row)d${reset}:${green_bold}%(col)d${reset}: ${red_bold}%(code)s${reset} %(text)s