Properly cleanup temporary directories in tests

ChangeLog

@@ -4,6 +4,7 @@ Version 1.1.3
    - Create ed25519 key files with secure permissions to avoid risk of
      insecure chmode call/race condition (Thanks to Hanno Böck for the report
      and the suggested fix) (LP: #2017430)
+   - Properly cleanup temporary directories in tests
 
 2023-04-09 Version 1.1.2
    - Verify correct AMS header is used for ARC seal verification (André Cruz)

dkim/tests/test_dkim_generate.py

@@ -60,6 +60,7 @@ class TestSignAndVerify(unittest.TestCase):
                     canonicalize=(header_algo, body_algo))
                 res = dkim.verify(sig + self.message, dnsfunc=self.dnsfuncRSA)
                 self.assertTrue(res)
+        tmpdir.cleanup()
 
 
     def test_generate_verifies_Ed25519_key(self):
@@ -82,6 +83,7 @@ class TestSignAndVerify(unittest.TestCase):
                     canonicalize=(header_algo, body_algo))
                 res = dkim.verify(sig + self.message, dnsfunc=self.dnsfuncED25519)
                 self.assertTrue(res)
+        tmpdir.cleanup()
 
 
     def dnsfuncRSA(self, domain, timeout=5):