adding check for default values

Author: djarecka

tools/checkspecs.py

@@ -272,6 +272,12 @@ def test_specs(self, uri):
                     if key == 'mandatory' and trait.mandatory is not None and not trait.mandatory:
                         bad_specs.append(
                             [uri, c, 'Inputs', traitname, 'mandatory=False'])
+                # checking if traits that have default_value different that the trits default one
+                # also have `usedefault` specified; excluding Enum, since it always has default value
+                if trait.trait_type.__class__.__name__ != "Enum"\
+                        and trait.default and "usedefault" not in trait.__dict__:
+                    bad_specs.append(
+                        [uri, c, 'Inputs', traitname, 'default value is set, no value for usedefault'])
 
             if not classinst.output_spec:
                 continue