add: test coverage

.coveragerc

@@ -0,0 +1,15 @@
+[run]
+source = pyethereum
+
+To exclude parts of your source from coverage, for example migrations folders:
+
+[report]
+omit = */dispatch/*
+
+[report]
+exclude_lines =
+  pragma: no cover
+  def __repr__
+  raise AssertionError
+  raise NotImplementedError
+  if __name__ == .__main__.:

.gitignore

@@ -17,4 +17,5 @@ __pycache__/
 .installed.cfg
 logging.conf
 .*.log
+.coverage
 /statedb/

.travis.yml

@@ -8,3 +8,6 @@ install:
 
 script:
   - tox -e $TOX_ENV
+
+after_success:
+    coveralls

README.rst

@@ -5,6 +5,10 @@ Ethereum Python Client
 .. image:: https://travis-ci.org/ethereum/pyethereum.png?branch=master
    :target: https://travis-ci.org/ethereum/pyethereum
 
+.. image:: https://coveralls.io/repos/ethereum/pyethereum/badge.png
+  :target: https://coveralls.io/r/ethereum/pyethereum
+
+
 Install
 =========
 Python2.7 is required.
@@ -25,7 +29,7 @@ one-liner:
 
 ``curl http://downloads.buildout.org/2/bootstrap.py | python``
 
-If your system has ``wget`` and not ``curl`` you can also use ``wget -O -`` 
+If your system has ``wget`` and not ``curl`` you can also use ``wget -O -``
 in place of ``curl``. Otherwise download the `bootstrap script <http://downloads.buildout.org/2/bootstrap.py>`_
 into the project folder and call ``python bootstrap.py``.  (If you get setuptools issue, try
 ``python bootstrap.py -v 2.1.1``)
@@ -89,7 +93,7 @@ If you need a more advanced setup, have a look at the
 
 **Easy Debugging:**
 The ``eth.py`` script, understands a command line flag for easy debugging, e.g.::
-    
+
     pyethereum/eth.py -L pyethereum.wire:DEBUG,:INFO ...<other args>
 
 will set the log-level for ``wire`` to ``DEBUG`` and the root logger to ``INFO``.

dev_requirements.txt

@@ -1,2 +1,3 @@
 behave
 mock
+coveralls

tox.ini

@@ -5,5 +5,6 @@ envlist = py27
 deps=
     behave
     mock
-commands=behave []
+    coveralls
+commands=coverage run {envbindir}/behave []
 sitepackages=False