Add more configuration tests

src/main.rs

@@ -36,3 +36,14 @@ async fn main() -> std::io::Result<()> {
         SubCommands::Client(c) => tcp_over_http::tcp_relay_client::run_app(c).await,
     }
 }
+
+#[cfg(test)]
+mod test {
+    use crate::CliArgs;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        CliArgs::command().debug_assert()
+    }
+}