public function testRegionCompareIgnoreCase()
{
$str1 = new Str("ASDFqwerty");
$str2 = new Str("QWERTYasdf");
$this->assertLessThanOrEqual(-1, $str1->regionCompareIgnoreCase(0, $str2, 0, 4));
$this->assertEquals($str1->regionCompareIgnoreCase(0, $str2, 6, 4), 0);
$this->assertGreaterThanOrEqual(1, $str2->regionCompareIgnoreCase(0, $str1, 0, 4));
}
