Add coverage

.coveragerc

+[run]
+branch = True
+source = docker
+
+[report]
+exclude_lines =
+    if __name__ == .__main__.:
+
+[html]
+directory = html

.gitignore

@@ -6,3 +6,5 @@ dist
 *.swp
 
 .tox
+.coverage
+html/*

test-requirements.txt

-mock==1.0.1
+mock==1.0.1
\ No newline at end of file
+coverage==3.7.1

tox.ini

@@ -5,7 +5,7 @@ skipsdist=True
 [testenv:py26]
 usedevelop=True
 commands =
-    {envpython} tests/test.py
+    {envbindir}/coverage run -p tests/test.py
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
@@ -13,14 +13,18 @@ deps =
 [testenv:py27]
 usedevelop=True
 commands =
-    {envpython} tests/test.py
+    {envbindir}/coverage run -p tests/test.py
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
+
 [testenv]
 usedevelop=True
 commands =
-    {envpython} tests/test.py
+    {envbindir}/coverage run -p tests/test.py
+    {envbindir}/coverage combine
+    {envbindir}/coverage report
+    {envbindir}/coverage html
 deps =
     -r{toxinidir}/requirements3.txt
     -r{toxinidir}/test-requirements.txt