1 files changed, 9 insertions, 8 deletions
diff --git a/Lib/test/test_mailbox.py b/Lib/test/test_mailbox.py
index 0991f74f84..2ba944335a 100644
--- a/Lib/test/test_mailbox.py
+++ b/Lib/test/test_mailbox.py
@@ -7,17 +7,12 @@ import email
 import email.message
 import re
 import io
-import shutil
 import tempfile
 from test import support
 import unittest
 import textwrap
 import mailbox
 import glob
-try:
-    import fcntl
-except ImportError:
-    pass
 
 
 class TestBase:
@@ -2142,9 +2137,9 @@ class MaildirTestCase(unittest.TestCase):
             if mbox:
                 fp.write(FROM_)
             fp.write(DUMMY_MESSAGE)
-        if hasattr(os, "link"):
+        try:
             os.link(tmpname, newname)
-        else:
+        except (AttributeError, PermissionError):
             with open(newname, "w") as fp:
                 fp.write(DUMMY_MESSAGE)
         self._msgfiles.append(newname)
@@ -2273,12 +2268,18 @@ Gregory K. Johnson
 """)
 
 
+class MiscTestCase(unittest.TestCase):
+    def test__all__(self):
+        blacklist = {"linesep", "fcntl"}
+        support.check__all__(self, mailbox, blacklist=blacklist)
+
+
 def test_main():
     tests = (TestMailboxSuperclass, TestMaildir, TestMbox, TestMMDF, TestMH,
              TestBabyl, TestMessage, TestMaildirMessage, TestMboxMessage,
              TestMHMessage, TestBabylMessage, TestMMDFMessage,
              TestMessageConversion, TestProxyFile, TestPartialFile,
-             MaildirTestCase, TestFakeMailBox)
+             MaildirTestCase, TestFakeMailBox, MiscTestCase)
     support.run_unittest(*tests)
     support.reap_children()