public function testContainsCountValidMultibyte()
 {
     $s = new Stringizer("文字列のそれ");
     $this->assertEquals(1, $s->containsCount("の"));
     $s = new Stringizer("文字列のそれ 文字列のそれ 文字列のそれ 文字列のそれ");
     $this->assertEquals(4, $s->containsCount("れ"));
 }