adjusting limit of open files

src/allmydata/test/test_node.py

@@ -3,9 +3,9 @@
 import stat
 import sys
 import time
+from platform import system
 import mock
 
-
 from twisted.trial import unittest
 from twisted.internet import defer
 from twisted.python import log
@@ -22,6 +22,14 @@
 import allmydata.test.common_util as testutil
 
 
+# avoid "too many open files" with macOS (only)
+# * this does not seem to be an issue with Linux
+# * appveyor complains about missing 'resource' module on Windows
+if 'Darwin' == system():
+    import resource
+    resource.setrlimit(resource.RLIMIT_NOFILE, (2000, -1))
+
+
 class LoggingMultiService(service.MultiService):
     def log(self, msg, **kw):
         pass