1 files changed, 7 insertions, 0 deletions
diff --git a/test/selfmount.py b/test/selfmount.py
index 55809740..6534aa25 100644
--- a/test/selfmount.py
+++ b/test/selfmount.py
@@ -138,6 +138,13 @@ def run(binary):
             check(run(f'python3 -c "{maker}" > {mount}/pane/{scratch}/ctl\n'.encode()) == '0', 'a 50 KB Edit block written through the mount')
             body = client.read(f'/pane/{scratch}/body').decode().splitlines()
             check(body == ['line %05d of the block' % i for i in range(2500)], f'it ran once, whole ({len(body)} lines)')
+            # Forty event reads held through the mount, a follower each, and
+            # the mount still answers the rest: 9ns keeps workers past what
+            # the editor holds (128), so `cat layout` is not queued behind
+            # them for ever.
+            held = run(f"for i in $(seq 40); do cat {mount}/pane/{first}/event > /dev/null & done; "
+                       f"sleep 1; timeout 10 cat {mount}/layout > /dev/null; st=$?; kill $(jobs -p); exit $st\n".encode())
+            check(held == '0', f'cat layout answers beside 40 held event reads ({held!r})')
             client.write('/exec', b'Msg still here\n')
             text = ''.join(cell[0] for cell in client.screen()['cells'])
             check('still here' in text, 'the editor answers after all of that')