fix requirements

Author: alimanfoo

requirements_dev.txt

@@ -46,7 +46,7 @@ python-dateutil==2.7.3
 readme-renderer==22.0
 requests==2.19.1
 requests-toolbelt==0.8.0
-setuptools-scm=3.1.0
+setuptools-scm==3.1.0
 s3fs==0.1.6
 s3transfer==0.1.13
 scandir==1.9.0

zarr/tests/test_convenience.py

@@ -4,6 +4,7 @@
 import atexit
 import os
 import unittest
+from numbers import Integral
 
 
 import numpy as np
@@ -136,7 +137,7 @@ def test_consolidate_metadata():
         cmd['.zgroup'] = None
 
     # test getsize on the store
-    assert isinstance(getsize(cmd), int)
+    assert isinstance(getsize(cmd), Integral)
 
     # test new metadata are not writeable
     with pytest.raises(PermissionError):