Add infrastructure for testing of mpl toolkits and a single test to d…

…emonstrate.

"python tests.py" runs all tests from mpl and the toolkits.
mpl_toolkits.test() runs tests of the toolkits only.

lib/mpl_toolkits/__init__.py

@@ -1,4 +1,51 @@
+import sys
+from matplotlib import Verbose
+from matplotlib import rcParams
+from matplotlib import __version__
+from matplotlib import use
+
+verbose = Verbose()
+
 try:
     __import__('pkg_resources').declare_namespace(__name__)
 except ImportError:
     pass # must not have setuptools
+
+toolkits_test_modules = [
+    'mpl_toolkits.tests.test_axesgrid1',
+    ]
+
+def test(verbosity=1):
+    """run the matplotlib test suite"""
+    old_backend = rcParams['backend']
+    try:
+        use('agg')
+        import nose
+        import nose.plugins.builtin
+        from matplotlib.testing.noseclasses import KnownFailure
+        from nose.plugins.manager import PluginManager
+
+        # store the old values before overriding
+        plugins = []
+        plugins.append( KnownFailure() )
+        plugins.extend( [plugin() for plugin in nose.plugins.builtin.plugins] )
+
+        manager = PluginManager(plugins = plugins)
+        config = nose.config.Config(verbosity = verbosity, plugins = manager)
+
+        success = nose.run( defaultTest = toolkits_test_modules,
+                            config=config,
+                            )
+    finally:
+        if old_backend.lower() != 'agg':
+            use(old_backend)
+
+    return success
+
+test.__test__ = False # nose: this function is not a test
+
+verbose.report('matplotlib version %s'%__version__)
+verbose.report('verbose.level %s'%verbose.level)
+verbose.report('interactive is %s'%rcParams['interactive'])
+verbose.report('platform is %s'%sys.platform)
+verbose.report('loaded modules: %s'%sys.modules.iterkeys(), 'debug')

lib/mpl_toolkits/tests/__init__.py

@@ -0,0 +1,16 @@
+from __future__ import print_function
+from matplotlib import rcParams, rcdefaults, use
+
+_multiprocess_can_split_ = True
+
+def setup():
+    use('Agg', warn=False) # use Agg backend for these tests
+
+    # These settings *must* be hardcoded for running the comparison
+    # tests and are not necessarily the default values as specified in
+    # rcsetup.py
+    rcdefaults() # Start with all defaults
+    rcParams['font.family'] = 'Bitstream Vera Sans'
+    rcParams['text.hinting'] = False
+    rcParams['text.hinting_factor'] = 8
+    rcParams['text.antialiased'] = False