tests: prepare common test infrastructure for CLI args

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com

src/test_util.rs

@@ -0,0 +1,24 @@
+// Copyright © 2025 Cyberus Technology GmbH
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+#[cfg(test)]
+pub mod tests {
+    use std::cmp::Ordering;
+
+    use clap::Arg;
+
+    pub fn assert_args_sorted<'a, F: Fn() -> R, R: Iterator<Item = &'a Arg>>(get_base_iter: F) {
+        let iter = get_base_iter().zip(get_base_iter().skip(1));
+        for (arg, next) in iter {
+            assert_ne!(
+                arg.get_id().cmp(next.get_id()),
+                Ordering::Greater,
+                "args not alphabetically sorted: arg={}, next={}",
+                arg.get_id(),
+                next.get_id()
+            );
+        }
+    }
+}