Add more clap tests.

Bug: 260823636
Test: atest compos_verify.test fd_server.test initrd_bootconfig.test composd_cmd.test
Change-Id: I7fe3fbf5b8c349618ccdef2f096b77737eabed42
diff --git a/compos/composd_cmd/composd_cmd.rs b/compos/composd_cmd/composd_cmd.rs
index b6d82aa..19c3720 100644
--- a/compos/composd_cmd/composd_cmd.rs
+++ b/compos/composd_cmd/composd_cmd.rs
@@ -163,3 +163,15 @@
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use clap::CommandFactory;
+
+    #[test]
+    fn verify_actions() {
+        // Check that the command parsing has been configured in a valid way.
+        Actions::command().debug_assert();
+    }
+}