tox: run py27,py35 envs by default; define a separate 'coverage' tox …

…environment (useful for running it locally)

tox.ini

@@ -1,47 +1,38 @@
 [tox]
-envlist = py27, pypy, py34, py35
+envlist = py27, py35
 
 [testenv]
 basepython =
     py27: {env:TOXPYTHON:python2.7}
-    pypy: {env:TOXPYTHON:pypy}
-    py34: {env:TOXPYTHON:python3.4}
     py35: {env:TOXPYTHON:python3.5}
 deps =
     pytest
     -rrequirements.txt
 install_command =
     {envpython} -m pip install -v {opts} {packages}
 commands =
-    # check that we have the expected Python version and architecture
-    {envpython} -c "import sys; print(sys.version)"
-    # run the test suite
-    py.test
+    # run the test suite against the package installed inside tox env
+    py.test {posargs:--pyargs defcon}
+
+[testenv:coverage]
+basepython = {env:TOXPYTHON:python3.5}
+deps =
+    {[testenv]deps}
+    pytest-cov
+skip_install = true
+commands=
+    # measure test coverage and create html report
+    py.test --cov --cov-report html {posargs}
 
 [testenv:coveralls]
 passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH
 basepython=python3.5
 deps =
-    {[testenv]deps}
-    pytest-cov
+    {[testenv:coverage]deps}
     coveralls
 skip_install = true
 ignore_outcome = true
 commands=
     # measure test coverage and upload report to coveralls
-    py.test --cov=Lib/defcon
+    py.test --cov
     coveralls
-
-[pytest]
-minversion = 2.8
-testpaths =
-    Lib/defcon
-python_files =
-    test_*.py
-python_classes =
-    *Test
-addopts =
-    # run py.test in verbose mode
-    -v
-    # show extra test summary info
-    -r a