diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 957e37c..c80eda5 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -18,14 +18,26 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+
     - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
         python-version: 3.9
+
     - name: Install package
       run: |
         pip install .[test]
+
     - name: Test with pytest
       run: |
         cd tests
-        pytest --headless .
+        pytest --headless --cov=lsqfitgui --cov-report=xml
+
+    - name: Upload tests to Codecov
+      uses: codecov/codecov-action@v2
+      with:
+        file: ./tests/coverage.xml
+        flags: unittests
+        env_vars: OS,PYTHON
+        name: codecov-umbrella
+        fail_ci_if_error: true
diff --git a/README.md b/README.md
index cd1ef85..842d245 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,7 @@
 [![Documentation Status](https://readthedocs.org/projects/lsqfitgui/badge/?version=latest)](https://lsqfitgui.readthedocs.io/en/latest/?badge=latest)
+[![Code Coverage](https://codecov.io/gh/ckoerber/lsqfit-gui/branch/master/graph/badge.svg)](https://codecov.io/gh/ckoerber/lsqfit-gui)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+
 # Lsqfit GUI
 
 Graphical user interface for `lsqfit` using `dash`.
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 87dedf0..49fface 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,3 +6,4 @@ black
 sphinx
 pydata-sphinx-theme
 myst-parser
+pytest-cov
diff --git a/setup.cfg b/setup.cfg
index 72be519..e180b42 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -40,6 +40,17 @@ exclude =
 test =
     dash[testing]
     pytest
+    pytest-cov
+dev =
+    numpy
+    scipy
+    dash[testing]
+    pytest
+    black
+    sphinx
+    pydata-sphinx-theme
+    myst-parser
+    pytest-cov
 
 
 [options.package_data]