test: improve coverage for internal/readline

Add tests for readline keys to improve coverage.
PR-URL: #20840
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Author: Masashi Hirano

test/parallel/test-readline-keys.js

@@ -279,6 +279,23 @@ addTest('\x1b[31ma\x1b[39ma', [
 {name: 'a',sequence: 'a'},
 ]);
 
+// rxvt keys with modifiers
+addTest('\x1b[a\x1b[b\x1b[c\x1b[d\x1b[e',[
+{name: 'up',sequence: '\x1b[a',code: '[a',shift: true},
+{name: 'down',sequence: '\x1b[b',code: '[b',shift: true},
+{name: 'right',sequence: '\x1b[c',code: '[c',shift: true},
+{name: 'left',sequence: '\x1b[d',code: '[d',shift: true},
+{name: 'clear',sequence: '\x1b[e',code: '[e',shift: true},
+]);
+
+addTest('\x1bOa\x1bOb\x1bOc\x1bOd\x1bOe',[
+{name: 'up',sequence: '\x1bOa',code: 'Oa',ctrl: true},
+{name: 'down',sequence: '\x1bOb',code: 'Ob',ctrl: true},
+{name: 'right',sequence: '\x1bOc',code: 'Oc',ctrl: true},
+{name: 'left',sequence: '\x1bOd',code: 'Od',ctrl: true},
+{name: 'clear',sequence: '\x1bOe',code: 'Oe',ctrl: true},
+]);
+
 // Reduce array of addKeyIntervalTest(..) right to left
 // with () => {} as initial function
 construnKeyIntervalTests=[