runmodes: suricata hint missing runmode

Ticket: #5711

tests/runmode_test/README.md

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+# Suricata Missing Runmode Issue
+
+This repository contains test files and documentation for addressing the "Missing runmode" issue 5711 in Suricata.
+
+## Issue Description
+
+The issue relates to Suricata not providing adequate feedback when the runmode is missing, leading to confusion for users.
+
+## Test Files
+
+- `test.yaml`: This file defines a verification test that checks for the "Missing runmode" error.
+- `runmode_test`: A directory where you can place any necessary configuration files or rules for the test.
+
+

tests/runmode_test/test.yaml

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+requires:
+  min-version: 7.0.0
+  pcap: false
+
+checks:
+  - shell:
+      args: suricata
+      expect: 1  # Expect an exit code of 1, indicating an error
+      expect-output: "ERROR: Missing runmode"  # Verify that the error message is present
+