Run clap debug asserts as a unit test

.github/workflows/ci.yml

@@ -34,6 +34,7 @@ jobs:
           toolchain: ${{matrix.rust}}
       - run: cargo check
       - run: cargo update && cargo check
+      - run: cargo test
 
   clippy:
     name: Clippy

src/opts.rs

@@ -161,3 +161,8 @@ fn parse_selector(s: &str) -> Result<Selector, <Selector as FromStr>::Err> {
         s.parse()
     }
 }
+
+#[test]
+fn test_cli() {
+    <Opts as clap::IntoApp>::into_app().debug_assert();
+}