diff -r a98fd4eeed40 Lib/idlelib/idle_test/test_configuration.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/idlelib/idle_test/test_configuration.py	Wed Jun 11 19:36:57 2014 +0530
@@ -0,0 +1,96 @@
+"""Unittests to ensure correctness of defualt config files"""
+import unittest
+from idlelib.configHandler import idleConf
+
+
+class DefaultConfigTest(unittest.TestCase):
+
+    def get_option(self, option, type=int):
+        option = idleConf.defaultCfg[self.cfgtype].Get(self.section, option)
+        return type(option)
+
+    def test_config_main(self):
+        get = self.get_option
+        self.cfgtype = 'main'
+
+        self.section = 'General'
+        self.assertIn(get('editor-on-startup'), (0, 1))
+        self.assertIn(get('autosave'), (0, 1))
+        self.assertNotEqual(get('print-command-posix', str.strip), '')
+        self.assertNotEqual(get('print-command-win', str.strip), '')
+        self.assertIn(get('delete-exitfunc'), (0, 1))
+
+        self.section = 'EditorWindow'
+        self.assertGreater(get('width'), 0)
+        self.assertGreater(get('height'), 0)
+        self.assertNotEqual(get('font', str.strip), '')
+        self.assertGreater(get('font-size'), 0)
+        self.assertIn(get('font-bold'), (0, 1))
+
+        self.section = 'Indent'
+        self.assertIn(get('use-spaces'), (0, 1))
+        self.assertGreater(get('num-spaces'), 0)
+
+        self.section = 'Theme'
+        self.assertIn(get('default'), (0, 1))
+        if get('default'):
+            self.assertIn('IDLE', get('name', str))
+
+        self.section = 'Keys'
+        self.assertIn(get('default'), (0, 1))
+        if get('default'):
+            self.assertIn('IDLE', get('name', str))
+
+        self.section = 'History'
+        self.assertIn(get('cyclic'), (0, 1))
+
+    def test_config_highlight(self):
+
+        def is_valid_hex_color(color):
+            """
+            color - six digit hex color code
+
+            color is valid if it is between 0 and 256**3(=16777216)
+            i.e. between 0x000000 and 0xffffff.
+            """
+            if len(color) is not 6:
+                return False
+            return 0 <= int(color, 16) < 16777216
+
+        get = self.get_option
+        self.cfgtype = 'highlight'
+        sections = idleConf.GetSectionList('default', self.cfgtype)
+        # expand the below tuple as neceassry
+        colors = ('black', 'blue', 'red', 'gray', 'white')
+
+        for s in sections:
+            options = idleConf.defaultCfg[self.cfgtype].GetOptionList(s)
+            self.section = s
+            for o in options:
+                color = get(o, str)
+                if color in colors:
+                    continue
+                self.assertTrue(is_valid_hex_color(color[1:]), # strip '#'
+                    "{} in {} in config-highlight.def has an invalid"
+                    " color code for {}.".format(o, self.section, color))
+
+    def test_config_extensions(self):
+        get = self.get_option
+        self.cfgtype = 'extensions'
+        sections = idleConf.GetSectionList('default', self.cfgtype)
+
+        for s in sections:
+            options = idleConf.defaultCfg[self.cfgtype].GetOptionList(s)
+            self.section = s
+            for o in options:
+                if o is 'enable':
+                    self.assertIn(get(o), (0, 1))
+                if 'bindings' in self.section.lower():
+                    pass # todo - validate key binding.
+                else:
+                    self.assertNotEqual(get(o, str.strip), '',
+                        "{} in {} in config-extensions.def has an empty "
+                        "config value.".format(o, self.section))
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)