diff --git a/.travis.yml b/.travis.yml
index 9f5ab6b..5ca56e9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,8 @@ matrix:
       python: "3.7"
       before_install:
         - choco install python3
-        - export PATH="/c/Python37;/c/Python37/Scripts;$PATH"
+        - export PATH="/c/Python37:/c/Python37/Scripts:$PATH"
+        - python -m pip install virtualenv
         - ls -la /c/Python37/Scripts
         - virtualenv $HOME/venv
         - source $HOME/venv/Scripts/activate
diff --git a/appveyor.yml b/appveyor.yml
index fdc3e40..5db1a9f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -6,4 +6,4 @@ install:
 - pip install .[test]
 
 test_script:
-- python -m unittest
+- tox
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..cf56dec
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,11 @@
+# tox.ini
+
+[tox]
+envlist = py{37}
+
+[testenv]
+description = Unit tests
+commands =
+    pip install .[test]
+    coverage run -m unittest
+    coverage report --omit tests/*