test(derive): Show derive bug

tests/derive/doc_comments_help.rs

@@ -14,7 +14,7 @@
 
 use crate::utils;
 
-use clap::{CommandFactory, Parser, ValueEnum};
+use clap::{CommandFactory, Parser, Subcommand, ValueEnum};
 
 #[test]
 fn doc_comments() {
@@ -248,3 +248,31 @@ fn doc_comment_about_handles_both_abouts() {
     // comment.
     assert_eq!(cmd.get_long_about(), None);
 }
+
+#[test]
+fn respect_subcommand_doc_comment() {
+    #[derive(Parser, Debug)]
+    pub enum Cmd {
+        /// For child
+        #[command(subcommand)]
+        Child(Child),
+    }
+
+    #[derive(Subcommand, Debug)]
+    pub enum Child {
+        One,
+        Twp,
+    }
+
+    const OUTPUT: &str = "\
+Usage: cmd <COMMAND>
+
+Commands:
+  child  
+  help   Print this message or the help of the given subcommand(s)
+
+Options:
+  -h, --help  Print help information
+";
+    utils::assert_output::<Cmd>("cmd --help", OUTPUT, false);
+}