Add a make target for tests

We are running the existing test_mime.py. All the other tests which
are not unit tests but more examples of code one can run interactively
are moved to the example directory.

Makefile.am

@@ -12,3 +12,9 @@ EXTRA_DIST =                    \
 	intltool-extract.in
 
 SUBDIRS = bin src po
+
+check: test
+
+test:
+	cd $(top_srcdir)/tests && \
+	python -m unittest discover

tests/lib/runall.py

@@ -1,28 +0,0 @@
-# Copyright (C) 2007, Red Hat, Inc.
-#
-# This library is free software; you can redistribute it and/or
-# modify it under the terms of the GNU Lesser General Public
-# License as published by the Free Software Foundation; either
-# version 2 of the License, or (at your option) any later version.
-#
-# This library is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-# Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public
-# License along with this library; if not, write to the
-# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA 02111-1307, USA.
-
-import unittest
-
-import test_mime
-
-runner = unittest.TextTestRunner()
-loader = unittest.TestLoader()
-
-suite = unittest.TestSuite()
-suite.addTest(loader.loadTestsFromModule(test_mime))
-
-runner.run(suite)