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()); }