Add a few test cases for config.

test/ConfigTest.py

+# Topydo - A todo.txt client written in Python.
+# Copyright (C) 2014 Bram Schoenmakers <me@bramschoenmakers.nl>
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+import unittest
+
+from Config import config
+
+class ConfigTest(unittest.TestCase):
+    def test_config1(self):
+        self.assertEquals(config("data/config1").default_action(), 'do')
+
+    def test_config2(self):
+        self.assertNotEquals(config("").default_action(), 'do')
+
+    def test_config3(self):
+        self.assertTrue(config("data/config2").ignore_weekends())

test/data/config1

+[topydo]
+default_action = do

test/data/config2

+[sort]
+ignore_weekends = huh