diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 000000000..0f1270750
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,7 @@
+# .coveragerc to control coverage.py
+
+[report]
+# Regexes for lines to exclude from consideration
+exclude_also =
+    # Don't complain if non-runnable code isn't run:
+    if __name__ == .__main__.:
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 12f4139c1..ff94f3e2b 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -20,8 +20,10 @@ jobs:
         exclude:
           # TODO Add Windows when regex wheel available for 3.13
           - {os: windows-latest, python-version: "3.13"}
+
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
@@ -29,14 +31,22 @@ jobs:
           allow-prereleases: true
           cache: pip
           cache-dependency-path: .github/workflows/tests.yml
-      - name: Upgrade pip
-        run: python -m pip install --upgrade pip
-      - name: Install pytest
-        run: python -m pip install --upgrade pytest
-      - name: Install sphinx-lint to pull dependencies
-        run: python -m pip install -v .
+
+      - name: Install dependencies
+        run: |
+          python -m pip install -U pip
+          python -m pip install -U wheel
+          python -m pip install -U tox
+
       - name: Download more tests from friend projects
         if: matrix.python-version == '3.13' && matrix.os == 'ubuntu-latest'
         run: sh download-more-tests.sh
-      - name: run tests
-        run: python -m pytest
+      - name: Tox tests
+        run: |
+          tox -e py
+
+      - name: Upload coverage
+        uses: codecov/codecov-action@v3
+        with:
+          flags: ${{ matrix.os }}
+          name: ${{ matrix.os }} Python ${{ matrix.python-version }}
diff --git a/.gitignore b/.gitignore
index b57921aa4..c92356674 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,9 @@ build/
 dist/
 __pycache__/
 *.egg-info/
+.coverage
 .envrc
 .tox/
 .venv/
 tests/fixtures/friends/
+coverage.xml
diff --git a/pyproject.toml b/pyproject.toml
index 138ea92e3..298c32435 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,6 +30,11 @@ dependencies = [
 dynamic = ["version"]
 
 
+[project.optional-dependencies]
+tests = [
+  "pytest",
+  "pytest-cov",
+]
 [project.urls]
 Repository = "https://github.com/sphinx-contrib/sphinx-lint"
 Changelog = "https://github.com/sphinx-contrib/sphinx-lint/releases"
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 000000000..fe5261b02
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,19 @@
+[tox]
+requires =
+    tox>=4.2
+env_list =
+    py{py3, 313, 312, 311, 310, 39, 38}
+
+[testenv]
+extras =
+    tests
+pass_env =
+    FORCE_COLOR
+commands =
+    {envpython} -m pytest \
+      --cov sphinxlint \
+      --cov tests \
+      --cov-report html \
+      --cov-report term \
+      --cov-report xml \
+      {posargs}