From: Geliang Tang <[email protected]>

Extract the main part of check() in pm_netlink.sh into a new helper
named mptcp_lib_check_output in mptcp_lib.sh.

This helper will be used for userspace dump addresses tests.

Co-developed-by: Matthieu Baerts (NGI0) <[email protected]>
Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>
Signed-off-by: Geliang Tang <[email protected]>
Reviewed-by: Matthieu Baerts (NGI0) <[email protected]>
Reviewed-by: Mat Martineau <[email protected]>
Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>
---
 tools/testing/selftests/net/mptcp/mptcp_lib.sh | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_lib.sh 
b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
index b1fe354cfe96..ed86bb0bab49 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_lib.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
@@ -373,3 +373,26 @@ mptcp_lib_check_tools() {
                esac
        done
 }
+
+mptcp_lib_check_output() {
+       local err="${1}"
+       local cmd="${2}"
+       local expected="${3}"
+       local cmd_ret=0
+       local out
+
+       if ! out=$(${cmd} 2>"${err}"); then
+               cmd_ret=${?}
+       fi
+
+       if [ ${cmd_ret} -ne 0 ]; then
+               mptcp_lib_print_err "[FAIL] command execution '${cmd}' stderr"
+               cat "${err}"
+               return 2
+       elif [ "${out}" = "${expected}" ]; then
+               return 0
+       else
+               mptcp_lib_print_err "[FAIL] expected '${expected}' got '${out}'"
+               return 1
+       fi
+}

-- 
2.43.0


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