getgroup can also create groups now

--HG--
branch : trunk

py/test/testing/test_parseopt.py

@@ -18,7 +18,15 @@ class TestParser:
         py.test.raises(ValueError, parser.addgroup, "hello")
         group2 = parser.getgroup("hello")
         assert group2 is group
-        py.test.raises(ValueError, parser.getgroup, 'something')
+
+    def test_getgroup_addsgroup(self):
+        parser = parseopt.Parser()
+        group = parser.getgroup("hello", description="desc")
+        assert group.name == "hello"
+        assert group.description == "desc"
+        group2 = parser.getgroup("hello")
+        assert group2 is group
+
 
     def test_group_addoption(self):
         group = parseopt.OptionGroup("hello")