tests: add test case for rename-to-same-name

kernel currently permits chains with same name when a transaction renames
2 chains to the same new name.  Add a test case for this.

Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/shell/testcases/chains/0014rename_0 b/tests/shell/testcases/chains/0014rename_0
new file mode 100755
index 00000000..bebe48d6
--- /dev/null
+++ b/tests/shell/testcases/chains/0014rename_0
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+$NFT add table t || exit 1
+$NFT add chain t c1 || exit 1
+$NFT add chain t c2 || exit 1
+# kernel should return EEXIST
+$NFT rename chain t c1 c2
+
+if [ $? -eq 0 ] ; then
+	echo "E: Renamed with existing chain" >&2
+	exit 1
+fi
+
+# same, should return EEXIST
+$NFT 'rename chain t c1 c3;rename chain t c2 c3'
+if [ $? -eq 0 ] ; then
+	echo "E: Renamed two chains to same name" >&2
+	exit 1
+fi