Add code coverage report

.travis.yml

@@ -1,12 +1,16 @@
 sudo: false
 language: python
+cache: pip
 python:
   - "2.6"
   - "2.7"
   - "3.3"
   - "3.4"
   - "3.5"
+  - "3.5-dev"
   - "3.6"
+  - "3.6-dev"
+  - "nightly"
 install:
   - pip install -U pip setuptools
   - pip install tox-travis pre-commit

README.md

@@ -1,3 +1,6 @@
+[![Build Status](https://travis-ci.org/oasis-open/cti-python-stix2.svg?branch=master)](https://travis-ci.org/oasis-open/cti-python-stix2)
+[![codecov](https://codecov.io/gh/oasis-open/cti-python-stix2/branch/master/graph/badge.svg)](https://codecov.io/gh/oasis-open/cti-python-stix2)
+
 # cti-python-stix2
 
 *This is an [OASIS Open Repository](https://www.oasis-open.org/resources/open-repositories/). See the [Governance](#governance) section for more information.*

tox.ini

@@ -2,8 +2,18 @@
 envlist = py26,py27,py33,py34,py35,py36,pycodestyle
 
 [testenv]
-deps = pytest
-commands = pytest
+deps =
+    -U
+    tox
+    pytest
+    pytest-cov
+    coverage
+    codecov
+commands =
+    py.test --cov=stix2 stix2/test/
+    codecov
+
+passenv = CI TRAVIS TRAVIS_*
 
 [testenv:pycodestyle]
 deps =
@@ -24,7 +34,7 @@ max-line-length=160
 python =
   2.6: py26
   2.7: py27, pycodestyle
-  3.3: py33
-  3.4: py34
-  3.5: py35
-  3.6: py36
+  3.3: py33, pycodestyle
+  3.4: py34, pycodestyle
+  3.5: py35, pycodestyle
+  3.6: py36, pycodestyle