diff --git a/.gitignore b/.gitignore
index c6622bd..665cfc3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ __pycache__/
 .venv/
 backup_tool
 *.egg-info/
+.tox/
diff --git a/Makefile b/Makefile
index 37a06ea..5c6d19b 100644
--- a/Makefile
+++ b/Makefile
@@ -35,3 +35,7 @@ app: backup_tool
 install: app
 	cp backup_tool /usr/local/bin
 .PHONY: install
+
+test: venv tox.ini
+	@ .venv/bin/tox
+.PHONY: test
diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/setup.py b/setup.py
index 8320683..7fd3d42 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,6 @@ setup(
             "black==20.8b1",
             "flake8==3.8.4",
             "tox==3.21.1",
-            "pytest==6.2.1",
         ]
     },
 )
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..0df47e0
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,7 @@
+[tox]
+envlist = py36,py37,py38,py39
+
+[testenv]
+deps = pytest
+commands =
+    pytest