diff --git a/.gitignore b/.gitignore
index 95ce38f..1d795ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .idea
+.tox
 *.egg-info
 mermaid.js
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..6063eaa
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,7 @@
+[build-system]
+requires = ["setuptools>=42.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+filterwarnings = ["ignore::DeprecationWarning"]
\ No newline at end of file
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..d48b3bc
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,5 @@
+from django.conf import settings
+
+
+def pytest_configure():
+    settings.configure(INSTALLED_APPS=["django_mermaid.apps.MermaidConfig"])
diff --git a/tests/requirements.txt b/tests/requirements.txt
new file mode 100644
index 0000000..e81991d
--- /dev/null
+++ b/tests/requirements.txt
@@ -0,0 +1,3 @@
+tox==3.24.3
+pytest==6.2.5
+pytest-django==4.5.2
\ No newline at end of file
diff --git a/tests/test_tag.py b/tests/test_tag.py
new file mode 100644
index 0000000..9f96201
--- /dev/null
+++ b/tests/test_tag.py
@@ -0,0 +1,8 @@
+from django_mermaid.templatetags.mermaid import mermaid
+
+
+def test_tag_renders():
+    assert mermaid("graph LR; A-->B;") == (
+        """<div class="mermaid">graph LR; A-->B;</div><script src="mermaid.js"></script>"""
+        """<script>mermaid.initialize({"startOnLoad": true, theme: "default"});</script>"""
+    )
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..3ffd9ee
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,17 @@
+[tox]
+envlist =
+    py{36,38,310}-django32
+    py{38,39,310}-django40
+    py{39,310,311}-django{41,main}
+
+[testenv]
+deps =
+    djangomain: https://github.com/django/django/tarball/main
+    django42: django<4.3
+    django41: django<4.2
+    django40: django<4.1
+    django32: django<3.3
+    -r{toxinidir}/tests/requirements.txt
+commands =
+    pip install -e .
+    pytest
\ No newline at end of file