tests: shell: cover add and create set command

This patch validates that creation of an already existing set bails out
with EEXIST.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/tests/shell/testcases/sets/0006create_set_0 b/tests/shell/testcases/sets/0006create_set_0
new file mode 100755 (executable)
index 0000000..ca36cf7
--- /dev/null
+++ b/tests/shell/testcases/sets/0006create_set_0
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# This testscase checks for add and create set commands.
+
+set -e
+$NFT add table t
+$NFT add set t s { type ipv4_addr \; }
+if $NFT create set t s { type ipv4_addr \; } 2>/dev/null ; then
+       echo "E: accepted set creation that already exists" >&2
+       exit 1
+fi
+$NFT add set t s { type ipv4_addr \; }
+
+exit 0