diff --git a/.ci/setup.sh b/.ci/setup.sh
new file mode 100755
index 0000000..e0efd53
--- /dev/null
+++ b/.ci/setup.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# configure CI environment
+
+# Failure is a natural part of life
+set -e
+
+# Other packages needed for CI tasks
+pip install \
+    coverage \
+    codecov \
+    pytest-cov \
+    requests
diff --git a/.gitignore b/.gitignore
index 943160b..7f0043c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,6 @@ __pycache__/
 # Others
 .cache
 *.tar.gz
+
+# code coverage
+**/.coverage
diff --git a/.travis.yml b/.travis.yml
index 5365c78..0ab4166 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,16 +7,18 @@ matrix:
       - os: linux
         python: 3.6
 
+before_install:
+  - .ci/setup.sh
+
 # Install cran-server
 install:
   - pip install .
 
 # Test cran-server
 script:
-  # Install libraries only needed by tests
-  - pip install requests
-  # Run tests
-  - python -m pytest
+  - python -m pytest --cov
+  - coverage report -m --fail-under=20
 
 after_success:
   - echo "tests passed"
+  - codecov
diff --git a/README.md b/README.md
index ae92ef9..0c4d62e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # cran-server
 
 ![Build Status](https://travis-ci.org/UptakeOpenSource/cran-server.svg?branch=master)
+[![codecov](https://codecov.io/gh/UptakeOpenSource/cran-server/branch/master/graph/badge.svg)](https://codecov.io/gh/UptakeOpenSource/cran-server)
 
 A self hosted CRAN-like R package repository.