Add config test

src/main.rs

@@ -37,3 +37,14 @@ fn main() {
 
     println!("Hello, world!");
 }
+
+#[cfg(test)]
+mod test {
+    use crate::AppConfig;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        AppConfig::command().debug_assert();
+    }
+}