test mandatory

test/test_parsing_group.py

@@ -68,3 +68,12 @@ def test_iter_on_groups():
     group_names = [res[0] for res in result]
     assert group_names == ['general', 'interface1']
 
+def test_iter_on_empty_group():
+    config = Config(OptionDescription("name", "descr", [] ))
+    result = list(config.iter_groups())
+    assert result == []
+    for i in config.iter_groups():
+        pass
+    for i in config:
+        pass
+    assert [] == list(config)

tiramisu/config.py

@@ -209,6 +209,16 @@ class Config(object):
             return True
         return False
 
+    def _test_mandatory(self, path, opt):
+        # mandatory options
+        homeconfig = self._cfgimpl_get_toplevel()
+        mandatory = homeconfig._cfgimpl_mandatory
+        if opt.is_mandatory() and mandatory:
+            if self._is_empty(opt) and \
+                    opt.is_empty_by_default():
+                raise MandatoryError("option: {0} is mandatory "
+                                      "and shall have a value".format(path))
+
     def __getattr__(self, name):
         return self._getattr(name)
 
@@ -299,15 +309,7 @@ class Config(object):
                         raise ConfigError('invalid calculated value returned'
                             ' for option {0}'.format(name))
                     self._cfgimpl_values[name] = _result
-
+            self._test_mandatory(name, opt_or_descr)
-            # mandatory options
-            homeconfig = self._cfgimpl_get_toplevel()
-            mandatory = homeconfig._cfgimpl_mandatory
-            if opt_or_descr.is_mandatory() and mandatory:
-                if self._is_empty(opt_or_descr) and \
-                        opt_or_descr.is_empty_by_default():
-                    raise MandatoryError("option: {0} is mandatory "
-                                          "and shall have a value".format(name))
             # frozen and force default
             if not opt_or_descr.has_callback() and opt_or_descr.is_forced_on_freeze():
                 return opt_or_descr.getdefault()
@@ -742,7 +744,15 @@ def mandatory_warnings(config):
     config._cfgimpl_get_toplevel()._cfgimpl_mandatory = True
     for path in config._cfgimpl_descr.getpaths(include_groups=True):
         try:
-            value = getattr(config, path)
+            if '.' in path:
+                homeconfig, path = config._cfgimpl_get_home_by_path(path)
+            else:
+                homeconfig = config
+            opt = getattr(homeconfig._cfgimpl_descr, path)
+            #for PropertiesOptionError
+            homeconfig._validate(path, opt)
+            if not isinstance(opt, OptionDescription):
+                homeconfig._test_mandatory(path, opt)
         except MandatoryError:
             yield path
         except PropertiesOptionError: