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-rw-r--r--tst/test_check.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/tst/test_check.py b/tst/test_check.py
index b9a89ff..9890209 100644
--- a/tst/test_check.py
+++ b/tst/test_check.py
@@ -36,6 +36,7 @@ NEXT_WEEK = SECONDS_AGO + timedelta(days=7)
 async def noop(reader, writer):
     """Do nothing."""
     writer.close()
+    await writer.wait_closed()
 
 
 def failed_to_get_cert(summary):