1 files changed, 68 insertions, 0 deletions
diff --git a/src/python/grpcio_tests/tests/unit/_cython/_fork_test.py b/src/python/grpcio_tests/tests/unit/_cython/_fork_test.py
new file mode 100644
index 0000000000..aeb02458a7
--- /dev/null
+++ b/src/python/grpcio_tests/tests/unit/_cython/_fork_test.py
@@ -0,0 +1,68 @@
+# Copyright 2018 gRPC authors.
+#
+# 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 os
+import threading
+import unittest
+
+from grpc._cython import cygrpc
+
+
+def _get_number_active_threads():
+    return cygrpc._fork_state.active_thread_count._num_active_threads
+
+
+@unittest.skipIf(os.name == 'nt', 'Posix-specific tests')
+class ForkPosixTester(unittest.TestCase):
+
+    def setUp(self):
+        cygrpc._GRPC_ENABLE_FORK_SUPPORT = True
+
+    def testForkManagedThread(self):
+
+        def cb():
+            self.assertEqual(1, _get_number_active_threads())
+
+        thread = cygrpc.ForkManagedThread(cb)
+        thread.start()
+        thread.join()
+        self.assertEqual(0, _get_number_active_threads())
+
+    def testForkManagedThreadThrowsException(self):
+
+        def cb():
+            self.assertEqual(1, _get_number_active_threads())
+            raise Exception("expected exception")
+
+        thread = cygrpc.ForkManagedThread(cb)
+        thread.start()
+        thread.join()
+        self.assertEqual(0, _get_number_active_threads())
+
+
+@unittest.skipUnless(os.name == 'nt', 'Windows-specific tests')
+class ForkWindowsTester(unittest.TestCase):
+
+    def testForkManagedThreadIsNoOp(self):
+
+        def cb():
+            pass
+
+        thread = cygrpc.ForkManagedThread(cb)
+        thread.start()
+        thread.join()
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)