public function testflatMapAssoc()
    {
        $array = array(
            'a' => array(
                '1' => array('.' => 0, ',' => 0),
                '2' => array('.' => 0, ',' => 0),
            ),
            'b' => array(
                '1' => array('.' => 0, ',' => 0),
                '2' => array('.' => 0, ',' => 0),
            ),
        );

        $keysList = array();
        $valuesList = array();
        Arrays::flatMapAssoc($array, function ($value, $keys) use (&$keysList, &$valuesList) {
            $keysList[] = $keys;
            $valuesList[] = $value;
        });

        $expectedKeysList = array(
            array('a', '1', '.'),
            array('a', '1', ','),
            array('a', '2', '.'),
            array('a', '2', ','),
            array('b', '1', '.'),
            array('b', '1', ','),
            array('b', '2', '.'),
            array('b', '2', ','),
        );
        $this->assertEquals($expectedKeysList, $keysList);
        $this->assertEquals(array_fill(0, 8, 0), $valuesList);
    }