codePointsAt example

    public function testCodePointsAt(array $expected, string $string, int $offset, int $form = null)
    {
        if (2 !== grapheme_strlen('च्छे') && 'नमस्ते' === $string) {
            $this->markTestSkipped('Skipping due to issue ICU-21661.');
        }

        $instance = static::createFromString($string);
        $instance = $form ? $instance->normalize($form) : $instance;

        $this->assertSame($expected, $instance->codePointsAt($offset));
    }

    public static function provideCodePointsAt(): array
    {
        return [
            [[], '', 0],
            [[], 'a', 1],
            [[0x53], 'Späßchen', 0],
            [[0xE4], 'Späßchen', 2],
            [[0xDF], 'Späßchen', -5],
            [[0x260E], '☢☎❄', 1],
        ];