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/verify/verify.rs b/compos/verify/verify.rs
index 745d5e9..71d8bcc 100644
--- a/compos/verify/verify.rs
+++ b/compos/verify/verify.rs
@@ -138,3 +138,15 @@
     file.read_to_end(&mut data)?;
     Ok(data)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use clap::CommandFactory;
+
+    #[test]
+    fn verify_args() {
+        // Check that the command parsing has been configured in a valid way.
+        Args::command().debug_assert();
+    }
+}