[PATCH ipset 3/3] tests: hash:net,iface.t: add test for exceeding the same-key bucket list

[Florian Westphal <fw@strlen.de>]

flush, add 63 duplicate keys again (should work), then add entry 64
(should fail).

This test fails before the rhashtable conversion, the old hash
implementation did not reset h->bucketsize on flush, so post-flush
next duplicate key immediately hits 'set full' error due to the
refusal to expand the bucket further.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 Fails on main, but not on rhashtable v8 patches.

 tests/hash:net,iface.t | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/hash:net,iface.t b/tests/hash:net,iface.t
index c4a8de45fced..0386cc7b7921 100644
--- a/tests/hash:net,iface.t
+++ b/tests/hash:net,iface.t
@@ -134,8 +134,12 @@
 0 n=`ipset list test | grep -v Revision: | wc -l` && test $n -eq 71
 # Flush test set
 0 ipset flush test
+# Add clashing elements after flush
+0 (set -e; for x in `seq 0 63`; do ipset add test 10.0.0.0/16,eth$x; done)
+# Check listing
+0 n=`ipset list test | grep -v Revision: | wc -l` && test $n -eq 71
 # Try to add more than 64 clashing entries
-1 (set -e; for x in `seq 0 64`; do ipset add test 10.0.0.0/16,eth$x; done)
+1 ipset add test 10.0.0.0/16,eth64
 # Delete test set
 0 ipset destroy test
 # Check all possible CIDR values
-- 
2.56.0