add test for construct mode

src/hdmf/container.py

@@ -304,7 +304,7 @@ def __new__(cls, *args, **kwargs):
     def __init__(self, **kwargs):
         name = getargs('name', kwargs)
         if ('/' in name or ':' in name) and not self._in_construct_mode:
-            raise ValueError(f"name '{name}' cannot contain '/' or ':'")
+            raise ValueError(f"name '{name}' cannot contain a '/' or ':'")
         self.__name = name
         self.__field_values = dict()
         self.__read_io = None

tests/unit/test_container.py

@@ -180,9 +180,17 @@ def test_set_parent_overwrite_proxy(self):
     def test_slash_restriction(self):
         self.assertRaises(ValueError, Container, 'bad/name')
 
+        # check no error raised in construct mode
+        child_obj = Container.__new__(Container, parent=None, object_id=None, in_construct_mode=True)
+        child_obj.__init__('bad/name')
+
     def test_colon_restriction(self):
         self.assertRaises(ValueError, Container, 'bad:name')
 
+        # check no error raised in construct mode
+        child_obj = Container.__new__(Container, parent=None, object_id=None, in_construct_mode=True)
+        child_obj.__init__('bad:name')
+
     def test_set_modified_parent(self):
         """Test that set modified properly sets parent modified
         """