Fixed #21701 -- Improved testing doc titles and added testing/tools.txt.

Thanks cjerdonek for the suggestion.

docs/internals/contributing/writing-code/unit-tests.txt

@@ -13,8 +13,8 @@ The tests cover:
 We appreciate any and all contributions to the test suite!
 
 The Django tests all use the testing infrastructure that ships with Django for
-testing applications. See :doc:`Testing Django applications
+testing applications. See :doc:`/topics/testing/overview` for an explanation of
-</topics/testing/overview>` for an explanation of how to write new tests.
+how to write new tests.
 
 .. _running-unit-tests:
 

docs/intro/contributing.txt

@@ -281,7 +281,7 @@ correctly in a couple different situations.
     computer programming, so there's lots of information out there:
 
     * A good first look at writing tests for Django can be found in the
-      documentation on :doc:`Testing Django applications </topics/testing/overview>`.
+      documentation on :doc:`/topics/testing/overview`.
     * Dive Into Python (a free online book for beginning Python developers)
       includes a great `introduction to Unit Testing`__.
     * After reading those, if you want something a little meatier to sink

docs/topics/email.txt

@@ -629,6 +629,5 @@ the email body. You then only need to set the :setting:`EMAIL_HOST` and
 :setting:`EMAIL_PORT` accordingly. For a more detailed discussion of SMTP
 server options, see the Python documentation for the :mod:`smtpd` module.
 
-For information about unit-testing the sending of emails in your
+For information about unit-testing the sending of emails in your application,
-application, see the :ref:`topics-testing-email` section of :doc:`Testing
+see the :ref:`topics-testing-email` section of the testing documentation.
-Django applications </topics/testing/overview>`.

docs/topics/testing/index.txt

@@ -2,12 +2,6 @@
 Testing in Django
 =================
 
-.. toctree::
-   :hidden:
-
-   overview
-   advanced
-
 Automated testing is an extremely useful bug-killing tool for the modern
 Web developer. You can use a collection of tests -- a **test suite** -- to
 solve, or avoid, a number of problems:
@@ -28,9 +22,6 @@ it should be doing.
 
 The best part is, it's really easy.
 
-Where to go from here
-=====================
-
 The preferred way to write tests in Django is using the :mod:`unittest` module
 built in to the Python standard library. This is covered in detail in the
 :doc:`overview` document.
@@ -38,3 +29,10 @@ built in to the Python standard library. This is covered in detail in the
 You can also use any *other* Python test framework; Django provides an API and
 tools for that kind of integration. They are described in the
 :ref:`other-testing-frameworks` section of :doc:`advanced`.
+
+.. toctree::
+   :maxdepth: 1
+
+   overview
+   tools
+   advanced