add devnotes

DEVNOTES.md

@@ -4,6 +4,7 @@ Notes for developers
 
 ```
 python -m unittest tests.test_pop.TestPop3.test_CAPA
+python -m unittest tests.test_smtp.TestSMTP
 ```
 
 ## Patch for enable logging in test
@@ -14,7 +15,11 @@ Patch generated using below
 git diff --patch -U1 tests >> ./DEVNOTES.md
 ```
 
-Apply with below
+Apply with below. Disables smtp test mail dir cleanup.
+```
+ls -ltd /tmp/m41*
+git checkout tests
+```
 
 ```bash
 git apply - <<PATCH
@@ -27,6 +32,18 @@ index 55c1a91..a825665 100644
 -    logging.basicConfig(level=logging.CRITICAL)
 +    logging.basicConfig(level=logging.DEBUG)
      td = tempfile.TemporaryDirectory(prefix="m41.pop.")
+diff --git a/tests/test_smtp.py b/tests/test_smtp.py
+index 0554d4c..52d147b 100644
+--- a/tests/test_smtp.py
++++ b/tests/test_smtp.py
+@@ -18,5 +18,5 @@ def setUpModule() -> None:
+     global MAILS_PATH
+-    logging.basicConfig(level=logging.CRITICAL)
++    logging.basicConfig(level=logging.DEBUG)
+     td = tempfile.TemporaryDirectory(prefix="m41.smtp.")
+-    unittest.addModuleCleanup(td.cleanup)
++    # unittest.addModuleCleanup(td.cleanup)
+     MAILS_PATH = Path(td.name)
 PATCH
 ```