A simple test follows:
Hello, World!
[] = []
[a] = [a]
[abcdef] = [abcdef]
["] = ["]
["""] = ["""]
[a"] = [a"]
["a] = ["a]
[a"b] = [a"b]
[a
b] = [a
b]
['] = [']
[a'a] = [a'a]
["'
<&>]
[
A]
[śzś]
[ČzČ]
[] = []
[a] = [a]
[abcdef] = [abcdef]
["] = ["]
["""] = ["""]
[a"] = [a"]
["a] = ["a]
[a"b] = [a"b]
[a
b] = [a
b]
['] = [']
[a'a] = [a'a]
["'
<&>]
[
A]
[śzś]
[ČzČ]