diff --git a/tests/base.py b/tests/base.py
index 8ca571d070..179d9faf5f 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -62,6 +62,7 @@ from git.exc import NoSuchPathError
 import yaml
 import paramiko
 from zuul.lib.connections import ConnectionRegistry
+from psutil import Popen
 
 import tests.fakegithub
 import zuul.driver.gerrit.gerritsource as gerritsource
@@ -3310,6 +3311,18 @@ class PostgresqlSchemaFixture(fixtures.Fixture):
         cur.execute("drop user %s" % self.name)
 
 
+class FakeCPUTimes:
+    def __init__(self):
+        self.user = 0
+        self.system = 0
+        self.children_user = 0
+        self.children_system = 0
+
+
+def cpu_times(self):
+    return FakeCPUTimes()
+
+
 class BaseTestCase(testtools.TestCase):
     log = logging.getLogger("zuul.test")
     wait_timeout = 90
@@ -3408,6 +3421,10 @@ class BaseTestCase(testtools.TestCase):
         self.addCleanup(handler.close)
         self.addCleanup(handler.flush)
 
+        if sys.platform == 'darwin':
+            # Popen.cpu_times() is broken on darwin so patch it with a fake.
+            Popen.cpu_times = cpu_times
+
 
 class SymLink(object):
     def __init__(self, target):
diff --git a/tests/unit/test_bubblewrap.py b/tests/unit/test_bubblewrap.py
index 8e6dddb776..822cb3ca5f 100644
--- a/tests/unit/test_bubblewrap.py
+++ b/tests/unit/test_bubblewrap.py
@@ -13,6 +13,7 @@
 import fixtures
 import logging
 import subprocess
+import sys
 import tempfile
 import testtools
 import time
@@ -21,6 +22,7 @@ import os
 from zuul.driver import bubblewrap
 from zuul.executor.server import SshAgent
 from tests.base import iterate_timeout
+from unittest import skipIf
 
 
 class TestBubblewrap(testtools.TestCase):
@@ -53,6 +55,7 @@ class TestBubblewrap(testtools.TestCase):
         # Make sure the _r's are closed
         self.assertEqual([], po.fds)
 
+    @skipIf(sys.platform == 'darwin', 'Not supported on MacOS')
     def test_bubblewrap_leak(self):
         bwrap = bubblewrap.BubblewrapDriver()
         context = bwrap.getExecutionContext()
diff --git a/tools/fake_bwrap.py b/tools/fake_bwrap.py
new file mode 100755
index 0000000000..ed8de76053
--- /dev/null
+++ b/tools/fake_bwrap.py
@@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+
+# Copyright 2020 BMW Group
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import argparse
+import os
+import subprocess
+
+
+def main():
+    pos_args = {
+        '--dir': 1,
+        '--tmpfs': 1,
+        '--ro-bind': 2,
+        '--bind': 2,
+        '--chdir': 1,
+        '--uid': 1,
+        '--gid': 1,
+        '--file': 2,
+        '--proc': 1,
+        '--dev': 1,
+    }
+    bool_args = [
+        '--unshare-all',
+        '--unshare-user',
+        '--unshare-user-try',
+        '--unshare-ipc',
+        '--unshare-pid',
+        '--unshare-net',
+        '--unshare-uts',
+        '--unshare-cgroup',
+        '--unshare-cgroup-try',
+        '--share-net',
+        '--die-with-parent',
+    ]
+    parser = argparse.ArgumentParser()
+    for arg, nargs in pos_args.items():
+        parser.add_argument(arg, nargs=nargs, action='append')
+    for arg in bool_args:
+        parser.add_argument(arg, action='store_true')
+    parser.add_argument('args', metavar='args', nargs=argparse.REMAINDER,
+                        help='Command')
+
+    args = parser.parse_args()
+
+    for fd, path in args.file:
+        fd = int(fd)
+        if path.startswith('/etc'):
+            # Ignore write requests to /etc
+            continue
+        print('Writing file from %s to %s' % (fd, path))
+        count = 0
+        with open(path, 'wb') as output:
+            data = os.read(fd, 32000)
+            while data:
+                count += len(data)
+                output.write(data)
+                data = os.read(fd, 32000)
+        print('Wrote file (%s bytes)' % count)
+
+    if args.chdir:
+        os.chdir(args.chdir[0][0])
+    result = subprocess.run(args.args, shell=False, check=False)
+    exit(result.returncode)
+
+
+if __name__ == '__main__':
+    main()