Added mock, coverage and pep8 dep. Added pep8 options

Author: montefra

doc/devel/testing.rst

@@ -18,11 +18,21 @@ The following software is required to run the tests:
 
   - nose_, version 1.0 or later
 
+  - `mock <http://www.voidspace.org.uk/python/mock/>`_, when running python
+    versions < 3.3
+
   - `Ghostscript <http://pages.cs.wisc.edu/~ghost/>`_ (to render PDF
     files)
 
   - `Inkscape <http://inkscape.org>`_ (to render SVG files)
 
+Optionally you can install:
+
+  - `coverage <http://nedbatchelder.com/code/coverage/>`_ to collect coverage
+    information
+
+  - `pep8 <http://pep8.readthedocs.org/en/latest>`_ to test coding standards
+
 Running the tests
 -----------------
 
@@ -36,6 +46,13 @@ The script can take any of the usual `nosetest arguments`_, such as
 ``--with-coverage``  enable collecting coverage information
 ===================  ===========
 
+Additionally it is possible to run only coding standard test or disable them:
+
+===================  ===========
+``--pep8``           run only PEP8 checks
+``--no-pep8``        disable PEP8 checks
+===================  ===========
+
 To run a single test from the command line, you can provide a
 dot-separated path to the module followed by the function separated by
 a colon, e.g., (this is assuming the test is installed)::