Add a UIUnitTest class

To make it easier to write UI unit tests.

src/sugar3/test/Makefile.am

@@ -1,4 +1,5 @@
 sugardir = $(pythondir)/sugar3/test
 sugar_PYTHON = \
 	__init__.py \
-	uitree.py
+	uitree.py \
+	unittest.py

src/sugar3/test/unittest.py

@@ -0,0 +1,53 @@
+# Copyright (C) 2012, Daniel Narvaez
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+"""
+UNSTABLE.
+"""
+
+from __future__ import absolute_import
+
+import logging
+import os
+import unittest
+import subprocess
+from contextlib import contextmanager
+
+from sugar3.test import uitree
+
+
+class UITestCase(unittest.TestCase):
+    def setUp(self):
+        logger = logging.getLogger()
+        self._orig_level = logger.getEffectiveLevel()
+        logger.setLevel(logging.DEBUG)
+
+    def tearDown(self):
+        logger = logging.getLogger()
+        logger.setLevel(self._orig_level)
+
+    @contextmanager
+    def run_view(self, name):
+        view_path = os.path.join("views", "%s.py" % name)
+        process = subprocess.Popen(["python", view_path])
+
+        try:
+            yield
+        except:
+            uitree.get_root().dump()
+            raise
+        finally:
+            process.terminate()