PYTHON-3403 Skips unit test if eventlent or gevent is imported (#1039)

Author: bcwarner

test/test_encryption.py

@@ -51,6 +51,7 @@
     TestCreator,
     TopologyEventListener,
     camel_to_snake_args,
+    is_greenthread_patched,
     rs_or_single_client,
     wait_until,
 )
@@ -334,6 +335,10 @@ def test_use_after_close(self):
         not hasattr(os, "register_at_fork"),
         "register_at_fork not available in this version of Python",
     )
+    @unittest.skipIf(
+        is_greenthread_patched(),
+        "gevent and eventlet do not support POSIX-style forking.",
+    )
     def test_fork(self):
         opts = AutoEncryptionOpts(KMS_PROVIDERS, "keyvault.datakeys")
         client = rs_or_single_client(auto_encryption_opts=opts)

test/test_fork.py

@@ -17,7 +17,11 @@
 import os
 from multiprocessing import Pipe
 from test import IntegrationTest, client_context
-from test.utils import ExceptionCatchingThread, rs_or_single_client
+from test.utils import (
+    ExceptionCatchingThread,
+    is_greenthread_patched,
+    rs_or_single_client,
+)
 from unittest import skipIf
 
 from bson.objectid import ObjectId
@@ -32,6 +36,10 @@ def setUpModule():
 @skipIf(
     not hasattr(os, "register_at_fork"), "register_at_fork not available in this version of Python"
 )
+@skipIf(
+    is_greenthread_patched(),
+    "gevent and eventlet do not support POSIX-style forking.",
+)
 class TestFork(IntegrationTest):
     def test_lock_client(self):
         """
@@ -156,5 +164,8 @@ def action(client):
         for t in threads:
             t.join()
 
+        for t in threads:
+            self.assertIsNone(t.exc)
+
         for c in clients:
             c.close()