test(parser): Show flag behavior

tests/builder/conflicts.rs

@@ -724,6 +724,30 @@ For more information, try '--help'.
     utils::assert_output(cmd, "test value1 sub1", CONFLICT_ERR, true);
 }
 
+#[test]
+#[cfg(feature = "error-context")]
+fn flag_conflicts_with_subcommand_long_flag() {
+    let cmd = Command::new("test")
+        .args_conflicts_with_subcommands(true)
+        .arg(arg!(--hello))
+        .subcommand(Command::new("sub").long_flag("sub"));
+
+    let res = cmd.try_get_matches_from(vec!["", "--hello", "--sub"]);
+    assert!(res.is_ok(), "error: {:?}", res.unwrap_err().kind());
+}
+
+#[test]
+#[cfg(feature = "error-context")]
+fn flag_conflicts_with_subcommand_short_flag() {
+    let cmd = Command::new("test")
+        .args_conflicts_with_subcommands(true)
+        .arg(arg!(--hello))
+        .subcommand(Command::new("sub").short_flag('s'));
+
+    let res = cmd.try_get_matches_from(vec!["", "--hello", "-s"]);
+    assert!(res.is_ok(), "error: {:?}", res.unwrap_err().kind());
+}
+
 #[test]
 fn subcommand_conflict_negates_required() {
     let cmd = Command::new("test")