Test three month for php recurrent rule https://github.com/simshaun/recurr/

testThreeMonths.php

<?php
public function testThreeMonths()
    {
        $timezone = 'Asia/Bangkok';
        $timezoneObj = new \DateTimeZone($timezone);

        /* *\/
        $rule = new RecurrenceRule(
            'FREQ=MONTHLY;COUNT=5;INTERVAL=3',
            new \DateTime('2013-06-13 00:00:00', $timezoneObj),
            $timezone
        );
        /* */

        /* *\/
        $rule = new RecurrenceRule(
            'FREQ=MONTHLY;INTERVAL=3',
            new \DateTime('2013-06-13 00:00:00', $timezoneObj),
            $timezone
        );

        $rule->setUntil(new \DateTime('2014-06-13 00:00:00', $timezoneObj));
        /* */

        $rule = new RecurrenceRule(
            'FREQ=MONTHLY;UNTIL=20140613;INTERVAL=3',
            new \DateTime('2013-06-13', $timezoneObj),
            $timezone
        );

        $this->transformer->setRule($rule);
        $computed = $this->transformer->getComputedArray();

        $this->assertEquals(5, count($computed));
        $this->assertEquals(new \DateTime('2013-06-13 00:00:00', $timezoneObj), $computed[0]);
        $this->assertEquals(new \DateTime('2013-09-13 00:00:00', $timezoneObj), $computed[1]);
        $this->assertEquals(new \DateTime('2013-12-13 00:00:00', $timezoneObj), $computed[2]);
        $this->assertEquals(new \DateTime('2014-03-13 00:00:00', $timezoneObj), $computed[3]);
        $this->assertEquals(new \DateTime('2014-06-13 00:00:00', $timezoneObj), $computed[4]);
    }