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)); }