diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index 3bee5a5..f543ae6 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -42,7 +42,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install wheel
-        pip install flake8 pytest
+        pip install flake8 pytest coverage
         
     - name: Install project dependencies
       run: |
@@ -55,6 +55,14 @@ jobs:
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     
-    - name: Test with pytest
+    - name: Test with coverage & pytest
       run: |
-        pytest
+        coverage run --source=tdvisu -m pytest .
+        coverage xml
+        
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        file: ./coverage.xml
+        flags: unittests
diff --git a/README.md b/README.md
index 341ee6d..ff7b68f 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,9 @@
 # TdVisu
 ![Maintenance](https://img.shields.io/badge/Maintained%3F-yes-green.svg)
-![Tests](https://github.com/VaeterchenFrost/tdvisu/workflows/Tests/badge.svg) 
 [![PyPI license](https://img.shields.io/pypi/l/tdvisu.svg)](https://pypi.python.org/pypi/tdvisu/)
+![Tests](https://github.com/VaeterchenFrost/tdvisu/workflows/Tests/badge.svg) 
+[![codecov](https://codecov.io/gh/VaeterchenFrost/tdvisu/branch/master/graph/badge.svg)](https://codecov.io/gh/VaeterchenFrost/tdvisu)
+
 
 ![GitHub release (latest SemVer including pre-releases)](https://img.shields.io/github/v/release/vaeterchenfrost/tdvisu?include_prereleases)
 [![PyPI version fury.io](https://badge.fury.io/py/tdvisu.svg)](https://pypi.python.org/pypi/tdvisu/)
@@ -12,7 +14,7 @@
 ![GitHub code size in bytes](https://img.shields.io/github/languages/code-size/VaeterchenFrost/tdvisu)
 ![GitHub commits since latest release (by SemVer)](https://img.shields.io/github/commits-since/VaeterchenFrost/tdvisu/latest)
 
-
+----------
 
 Visualization for [dynamic programming](https://en.wikipedia.org/wiki/Dynamic_programming) on [tree decompositions](https://en.wikipedia.org/wiki/Tree_decomposition).
 
@@ -26,6 +28,7 @@ For the portable and light weight '.svg' format, all graphs for a timestep can b
 
 With the '.svg' format the images are highly customizable, and even combining several timesteps together using svg [animate](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/animate) would be an option in the future.
 
+----------
 
 # Using
 [Alubbock:Graphviz](https://anaconda.org/alubbock/graphviz) (or [Graphviz (>=2.38)](https://graphviz.gitlab.io/download/))
@@ -68,6 +71,7 @@ pip install .[test]
 pytest .\test\
 ```
 
+----------
 
 # How to use
 
@@ -144,3 +148,6 @@ In case any dependencies changed, or just to update some, check in
 - For details see: [Upload Python Package](https://github.com/VaeterchenFrost/tdvisu/blob/master/.github/workflows/python-app.yml )
 
 **Now you are set for the new release :tada:**
+
+----------
+
diff --git a/setup.py b/setup.py
index ac48784..9d7b945 100644
--- a/setup.py
+++ b/setup.py
@@ -25,9 +25,12 @@ def read_files(files, delim: str = "\n") -> str:
         The concatenated string.
     """
     data = []
-    for file in files:
-        with open(file, encoding='utf-8') as handle:
-            data.append(handle.read())
+    try:
+        for file in files:
+            with open(file, encoding='utf-8') as handle:
+                data.append(handle.read())
+    except IOError:
+        pass
     return delim.join(data)