public function testExtract()
{
$string = new Str('abcdefgh');
$sub = $string->extract(1);
$this->isInstanceOf(Str::class, $sub);
$this->assertEquals('bcdefgh', $sub->getInternalValue());
$sub = $string->extract(1, 1);
$this->isInstanceOf(Str::class, $sub);
$this->assertEquals('b', $sub->getInternalValue());
$sub = $string->extract(1, -1);
$this->isInstanceOf(Str::class, $sub);
$this->assertEquals('bcdefg', $sub->getInternalValue());
// with accented charcaters
$string = new Str('chaîne accentuée');
$sub = $string->extract(3, 1);
$this->isInstanceOf(Str::class, $sub);
$this->assertEquals('î', $sub->getInternalValue());
}
