Run tests in virtualenvs using tox

Signed-off-by: Zack Cerza <zack@redhat.com>

tox.ini

@@ -0,0 +1,55 @@
+[tox]
+envlist = flake8,py2,py3
+
+[testenv:flake8]
+deps =
+    flake8
+# On EL6, pip would get us a flake8 that doesn't work with python2.6. The next
+# two lines let us use an RPM-based version from EPEL if it is installed
+sitepackages = true
+whitelist_externals = flake8
+# These two lines just speed things up by avoiding unnecessary setup
+skip_install=true
+usedevelop=true
+commands =
+    flake8 --exclude=.tox
+
+[testenv]
+deps =
+    -r{toxinidir}/requirements.txt
+    -r{toxinidir}/test-requirements.txt
+# We need to access python-rpm, at least, and potentially more on EL6
+sitepackages = true
+# If rpm's python bindings are missing, don't continue
+# Also, because coverage might be installed system-wide and it serves as our
+# entry point, let's make sure it's installed in the virtualenv.
+commands_pre =
+    {envbindir}/python -c "import rpm"
+    pip install -I coverage
+
+[testenv:py3]
+setenv = 
+    PYTHONPATH=hub/.:plugins/hub/.:plugins/builder/.:plugins/cli/.:cli/.:www/lib
+commands_pre =
+    {[testenv]commands_pre}
+    {envbindir}/coverage3 erase --rcfile .coveragerc3
+commands = 
+    {envbindir}/coverage3 run --rcfile .coveragerc3 --source . -m nose
+    {envbindir}/coverage3 report --rcfile .coveragerc3
+    {envbindir}/coverage3 html -d {toxinidir}/htmlcov/py3 --rcfile .coveragerc3
+
+[testenv:py2]
+setenv = 
+    PYTHONPATH=.:plugins/builder/.:plugins/cli/.:cli/.:www/lib
+commands_pre =
+    {[testenv]commands_pre}
+    {envbindir}/coverage2 erase
+commands =
+    {envbindir}/coverage2 run --source . -m nose \
+        tests/test_builder tests/test_cli \
+        tests/test_plugins/test_runroot_builder.py \
+        tests/test_plugins/test_save_failed_tree_builder.py \
+        tests/test_plugins/test_runroot_cli.py \
+        tests/test_plugins/test_save_failed_tree_cli.py
+    {envbindir}/coverage2 report
+    {envbindir}/coverage2 html -d {toxinidir}/htmlcov/py3