add unit test

Author: vincentschut

zarr/tests/test_hierarchy.py

@@ -492,6 +492,8 @@ def test_getattr(self):
         # test
         eq(g1['foo'], g1.foo)
         eq(g2['bar'], g2.bar)
+        # test that hasattr returns False instead of an exception (issue #88)
+        eq(hasattr(g1, '__unexistingattribute__'), False)
 
     def test_group_repr(self):
         g = self.create_group()