Add CU-UP functional test to ctest

Use the CU-UP load tester to test the functionality of the CU-UP and
its loader tester. The requirements on this load test are intentionally
low, as it will be run with other unit tests in parallel, and should
still pass.

It uses an existing configuration file for the CU-UP. The test script
runs the CU-UP, runs the load tester, stops the CU-UP, and returns the
load tester return value as test result (which will be 0=success if all
packets have been received).

tests/nr-cuup/CMakeLists.txt

@@ -1,4 +1,14 @@
 add_executable(nr-cuup-load-test nr-cuup-load-test.c)
+add_dependencies(nr-cuup-load-test params_libconfig)
 target_link_libraries(nr-cuup-load-test PRIVATE GTPV1U ${T_LIB} utils ITTI e1ap
   SCTP_CLIENT)
 target_link_libraries(nr-cuup-load-test PRIVATE asn1_lte_rrc_hdrs asn1_nr_rrc_hdrs) # ITTI
+
+if(ENABLE_TESTS)
+  # we add also nr-cuup as it is required for the test
+  add_dependencies(tests nr-cuup-load-test nr-cuup)
+  add_test(NAME nr_cuup_functional_test
+           COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/nr-cuup-functional-test.sh ${CMAKE_CURRENT_SOURCE_DIR}/load-test.conf
+           WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+  )
+endif()

tests/nr-cuup/nr-cuup-functional-test.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+# this script takes one argument, which is the path to the CU-UP configuration
+if [ $# -ne 1 ]; then
+  echo "usage: $0 <cuup-config>"
+  exit 1
+fi
+
+CONFIG=$1
+
+set -x
+
+# current dir should be CMAKE_BINARY_DIR
+./nr-cuup -O ${CONFIG} &
+CUUP_PID=$!
+
+timeout 5s ./tests/nr-cuup/nr-cuup-load-test -t 3 -d 10 -u 10
+RET=$?
+
+kill ${CUUP_PID}
+exit ${RET}