reduce noise in test_multivol_compression_sizes.py

diff --git a/testing/test_multivol_compression_sizes.py b/testing/test_multivol_compression_sizes.py
index 8b64805..b2fbc93 100644 (file)
--- a/testing/test_multivol_compression_sizes.py
+++ b/testing/test_multivol_compression_sizes.py
@@ -57,7 +57,10 @@ def _get_random_file(dir_name, rec_level):
         return None
 
     #print('_get_random_file in {}, level {}'.format(dir_name, rec_level))
-    contents = os.listdir(dir_name)
+    try:
+        contents = os.listdir(dir_name)
+    except PermissionError:
+        return None
     if not contents:
         return None