Refactor: reduce duplication and tighten helpers

- Remove redundant applicationUri log in print_application_description
- Use UA_SECURITY_POLICY_NONE_URI macro instead of hardcoded string
- Extract _s_register_with_lds / _s_deregister_from_lds helpers
- Rename signal handler param 'sign' to 'sig' for consistency
- Add INT_MIN/INT_MAX bounds check to config_require_int
- Extract shared test helpers into tests/test_helpers.sh

1 files changed, 56 insertions, 0 deletions

diff --git a/tests/test_helpers.sh b/tests/test_helpers.sh
new file mode 100644
index 0000000..a9d420c
--- /dev/null
+++ b/tests/test_helpers.sh
@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+# ---------------------------------------------------------------
+# Shared helpers for OPC UA discovery integration tests.
+#
+# Source this file from test scripts:
+#   source "$(dirname "$0")/test_helpers.sh"
+# ---------------------------------------------------------------
+
+FAILURES=0
+
+# Waits up to 5 seconds for a process to listen on a TCP port.
+# Exits immediately if the process dies before the port opens.
+#
+#   wait_for_port <port> <pid> <label>
+wait_for_port() {
+  local port="$1" pid="$2" label="$3" i=0
+  while [ $i -lt 50 ]; do
+    if ! kill -0 "$pid" 2>/dev/null; then
+      echo "FAIL: $label exited prematurely"
+      exit 1
+    fi
+    if ss -tlnp 2>/dev/null | grep -q ":${port} "; then
+      return 0
+    fi
+    sleep 0.1
+    i=$((i + 1))
+  done
+  echo "FAIL: $label did not listen on port $port within 5 s"
+  exit 1
+}
+
+# Records a PASS/FAIL result.  Increments FAILURES on failure.
+#
+#   check <label> <exit-code>
+check() {
+  local label="$1" result="$2"
+  if [ "$result" -eq 0 ]; then
+    echo "PASS: $label"
+  else
+    echo "FAIL: $label"
+    FAILURES=$((FAILURES + 1))
+  fi
+}
+
+# Asserts that the given TCP ports are not already in use.
+# Exits immediately if any port is occupied.
+#
+#   assert_ports_free <port> [port...]
+assert_ports_free() {
+  for port in "$@"; do
+    if ss -tlnp 2>/dev/null | grep -q ":${port} "; then
+      echo "FAIL: port $port is already in use"
+      exit 1
+    fi
+  done
+}