test_errno was a no-op test; now it actually tests things and uses unittest.
diff --git a/Misc/NEWS b/Misc/NEWS
index cb84491..890b7f7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -78,6 +78,8 @@
 Tests
 -----
 
+- Rewrite test_errno to use unittest and no longer be a no-op.
+
 - GHOP 234: Convert test_extcall to doctest.
 
 - GHOP 290: Convert test_dbm and test_dummy_threading to unittest.