diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..b6dc4ff
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,8 @@
+[run]
+omit = *_patch*,chaussette/tests/*
+source = chaussette
+include = chaussette/*
+
+[html]
+directory = html
+
diff --git a/tox.ini b/tox.ini
index 113fe3f..e016202 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,9 +2,15 @@
 envlist = flake8,py26,py27,py33,docs
 
 [testenv]
-commands =
-    python setup.py develop
-    python setup.py test
+commands = {envbindir}/python setup.py test
+
+[testenv:py27]
+deps = coverage
+
+commands = coverage erase
+           {envbindir}/python setup.py develop
+           coverage run setup.py test
+           coverage html
 
 [testenv:docs]
 deps = Sphinx