[pygobject] docs: update building/testing with new setup.py features

[Christoph Reiter <creiter src gnome org>]

commit 1330712bcf8109090bacf0cdfbba0c2a47930ac9
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Wed Feb 7 09:35:08 2018 +0100

    docs: update building/testing with new setup.py features

 docs/devguide/building_testing.rst | 45 +++++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 20 deletions(-)
---
diff --git a/docs/devguide/building_testing.rst b/docs/devguide/building_testing.rst
index 901f3ea4..f3ac215a 100644
--- a/docs/devguide/building_testing.rst
+++ b/docs/devguide/building_testing.rst
@@ -5,50 +5,55 @@ Building & Testing
 Using Autotools
 ---------------
 
-Building for Python 2:
-
-::
+.. code:: shell
 
+    # Building for Python 2
     ./autogen.sh --with-python=python2
     make
 
-Building for Python 3:
-
-::
-
+    # Building for Python 3
     ./autogen.sh --with-python=python3
     make
 
+    # Executing some code after the build
+    PYTHONPATH=. python3 foo.py
 
-To run the test suite::
-
+    # To run the test suite
     make check
 
-To test only a specific file/class/function::
-
+    # To test only a specific file/class/function::
     make check TEST_NAMES=test_gi
     make check TEST_NAMES=test_gi.TestUtf8
     make check TEST_NAMES=test_gi.TestUtf8.test_utf8_full_return
 
-To execute all the tests in a gdb session::
-
+    # To execute all the tests in a gdb session
     make check.gdb
 
-To executes all the tests in valgrind::
-
+    # To executes all the tests in valgrind
     make check.valgrind
 
-To execute flake8 tests::
-
+    # To execute flake8 tests
     make check.quality
 
 
 Using Setuptools
 ----------------
 
-Building and testing in the source directory:
+.. code:: shell
+
+    # Build in-tree
+    python3 setup.py build_ext --inplace
 
-::
+    # Executing some code after the build
+    PYTHONPATH=. python3 foo.py
 
-    python2 setup.py test
+    # Running tests
     python3 setup.py test
+
+    # To test only a specific file/class/function::
+    TEST_NAMES=test_gi python3 python3 setup.py test
+    TEST_NAMES=test_gi.TestUtf8 python3 setup.py test
+    TEST_NAMES=test_gi.TestUtf8.test_utf8_full_return python3 setup.py test
+
+    # Running flake8 tests
+    python3 setup.py quality