public function testConcat()
{
$s = new Stringizer("dog");
$this->assertEquals("god", $s->reverse());
$s = new Stringizer("stop");
$this->assertEquals("pots", $s->reverse());
$s = new Stringizer("mad");
$this->assertEquals("dam", $s->reverse());
$s = new Stringizer("mood");
$this->assertEquals("doom", $s->reverse());
$s = new Stringizer("文字列のそれ");
$this->assertEquals("れその列字文", $s->reverse());
}
