public function testMap()
 {
     $this->assertSame(['foofoofoo', 'bar' => 'bazbazbaz'], ArrayUtils::map('str_repeat', array('foo', 'bar' => 'baz'), 3));
     $this->assertSame(['1', '2'], ArrayUtils::map(function ($number) {
         return $number . "";
     }, [1, 2]));
 }