test: add readline test for escape sequence

Tests do not cover a small piece of code in lib/internal/readline/utils.js for consuming an escape sequence. This adds a minimal test to cover the code. Refs: https://coverage.nodejs.org/coverage-0848f56cb3943209/lib/internal/readline/utils.js.html#L327 PR-URL: #34952 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]>

Author: Trott

test/parallel/test-readline-keys.js

@@ -114,6 +114,9 @@ addTest('\x1b\x1b\x1b', [
 {name: 'escape',sequence: '\x1b\x1b\x1b',meta: true},
 ]);
 
+// Escape sequence
+addTest('\x1b]',[{name: undefined,sequence: '\x1B]',meta: true}]);
+
 // Control keys
 addTest('\x01\x0b\x10',[
 {name: 'a',sequence: '\x01',ctrl: true},