Document test execution, and match Tox Python versions to setup.py's …

…versions

README.rst

@@ -181,6 +181,23 @@ When you need to know state information RIGHT AWAY, there's the *states* script.
         block: http://www2.census.gov/geo/tiger/TIGER2010/TABBLOCK/2010/tl_2010_24_tabblock10.zip
 
 
+Running Tests
+-------------
+
+CircleCI is set up to automatically run unit tests against any new commits to
+the repo. To run these tests yourself in a standardized, Dockerized
+environment, install
+`the CircleCI CLI <https://circleci.com/docs/2.0/local-cli/>`_, and then
+execute the tests with: ::
+
+    circleci local execute --job build
+
+Alternatively, you can run tests against only your current version of Python,
+using: ::
+
+    pytest tests
+
+
 Contributing
 ------------
 
@@ -194,6 +211,7 @@ Any changes other than additions to *data.db* should come with appropriate
 tests in *test.py*. Also check to see if the *states* CLI script should be
 modified to accommodate your change.
 
+
 Changelog
 ---------
 

tox.ini

@@ -1,5 +1,6 @@
 [tox]
-envlist = py27,py37
+# Mirror the Python versions listed in `setup.py`
+envlist = py27,py34,py35,py36,py37
 
 [testenv]
 deps = -rrequirements.txt