Move info on running all unit tests into the Sphinx docs

PYTHON_STYLE_GUIDE.md

@@ -57,46 +57,10 @@ we use the `format()` version. The [official Python documentation says](https://
 
 ## Writing (Python) Tests
 
-We write tests for our Python code using the [pytest](http://pytest.org/latest/) framework.
+We write unit tests for our Python code using the [pytest](http://pytest.org/latest/) framework.
 
 All tests go in the `bigchaindb/tests` directory or one of its subdirectories. You can use the tests already in there as templates or examples.
 
-### Standard Ways to Run All Tests
+The BigchainDB Documentation has a [section explaining how to run all unit tests](http://bigchaindb.readthedocs.org/en/develop/running-unit-tests.html).
 
-To run all the tests, first make sure you have RethinkDB running:
-```text
-$ rethinkdb
-```
-
-then in another terminal, do:
-```text
-$ py.test -v
-```
-
-If that doesn't work (e.g. maybe you are running in a conda virtual environment), try:
-```text
-$ python -m pytest -v
-```
-
-You can also run all tests via `setup.py`, using:
-```text
-$  python setup.py test
-```
-
-### Using `docker-compose` to Run the Tests
-
-You can use `docker-compose` to run the tests. (You don't have to start RethinkDB first: `docker-compose` does that on its own, when it reads the `docker-compose.yml` file.)
-
-First, build the images (~once), using:
-```text
-$ docker-compose build
-```
-
-then run the tests using:
-```text
-$ docker-compose run --rm bigchaindb py.test -v
-```
-
-### Automated Testing of All Pull Requests
-
-We use [Travis CI](https://travis-ci.com/), so that whenever someone creates a new BigchainDB pull request on GitHub, Travis CI gets the new code and does _a bunch of stuff_. You can find out what we tell Travis CI to do in [the `.travis.yml` file](.travis.yml): it tells Travis CI how to install BigchainDB, how to run all the tests, and what to do "after success" (e.g. run `codecov`). (We use [Codecov](https://codecov.io/) to get a rough estimate of our test coverage.)
+**Automated testing of pull requests.** We use [Travis CI](https://travis-ci.com/), so that whenever someone creates a new BigchainDB pull request on GitHub, Travis CI gets the new code and does _a bunch of stuff_. You can find out what we tell Travis CI to do in [the `.travis.yml` file](.travis.yml): it tells Travis CI how to install BigchainDB, how to run all the tests, and what to do "after success" (e.g. run `codecov`). (We use [Codecov](https://codecov.io/) to get a rough estimate of our test coverage.)

docs/source/index.rst

@@ -14,6 +14,7 @@ Table of Contents
 
    introduction
    installing-server
+   running-unit-tests
    python-server-api-examples
    bigchaindb-cli
    http-client-server-api

docs/source/running-unit-tests.md

@@ -0,0 +1,41 @@
+# Running Unit Tests
+
+Once you've installed BigchainDB Server, you may want to run all the unit tests. This section explains how.
+
+First of all, if you installed BigchainDB Server using `pip` (i.e. by getting the package from PyPI), then you didn't install the tests. Before you can run all the unit tests, you must [install BigchainDB from source](http://bigchaindb.readthedocs.org/en/develop/installing-server.html#how-to-install-bigchaindb-from-source).
+
+To run all the unit tests, first make sure you have RethinkDB running:
+```text
+$ rethinkdb
+```
+
+then in another terminal, do:
+```text
+$ py.test -v
+```
+
+If the above command doesn't work (e.g. maybe you are running in a conda virtual environment), try:
+```text
+$ python -m pytest -v
+```
+
+(We write our unit tests using the [pytest](http://pytest.org/latest/) framework.)
+
+You can also run all unit tests via `setup.py`, using:
+```text
+$  python setup.py test
+```
+
+### Using `docker-compose` to Run the Tests
+
+You can also use `docker-compose` to run the unit tests. (You don't have to start RethinkDB first: `docker-compose` does that on its own, when it reads the `docker-compose.yml` file.)
+
+First, build the images (~once), using:
+```text
+$ docker-compose build
+```
+
+then run the unit tests using:
+```text
+$ docker-compose run --rm bigchaindb py.test -v
+```