DateTime range overlapped ?

DatePeriodHelper.php

<?php

use DatePeriod;

class DatePeriodHelper
{

    /**
     * @param DatePeriod $datePeriod1
     * @param DatePeriod $datePeriod2
     * @return boolean
     */
    public static function isOverlapped(DatePeriod $datePeriod1, DatePeriod $datePeriod2)
    {
        return $datePeriod1->getEndDate() > $datePeriod2->getStartDate()
          && $datePeriod1->getStartDate() < $datePeriod2->getEndDate();
    }
}

DatePeriodHelperTest.php

<?php

use DateTime;
use DatePeriod;
use DateInterval;
use Zgok\HelperBundle\Helper\DatePeriodHelper;

class DatePeriodHelperTest extends \PHPUnit_Framework_TestCase
{

    /** @test */
    public function isOverlapped_returns_false_when_first_dateperiod_is_before_second_dateperiod()
    {
        $interval = DateInterval::createFromDateString('1 hour');

        $begin = new DateTime('2016-01-01 00:00:00');
        $end = new DateTime('2016-01-01 01:00:00');
        $firstDatePeriod = new DatePeriod($begin, $interval, $end);

        $secondBegin = new DateTime('2016-01-01 01:00:00');
        $secondEnd = new DateTime('2016-01-01 02:00:00');
        $secondDatePeriod = new DatePeriod($secondBegin, $interval, $secondEnd);
        
        assertThat(
            DatePeriodHelper::isOverlapped($firstDatePeriod, $secondDatePeriod),
            is(false)
        );
    }

    /** @test */
    public function isOverlapped_returns_false_when_first_dateperiod_is_after_dateperiod()
    {
        $interval = DateInterval::createFromDateString('1 hour');

        $begin = new DateTime('2016-01-01 02:00:00');
        $end = new DateTime('2016-01-01 03:00:00');
        $firstDatePeriod = new DatePeriod($begin, $interval, $end);

        $secondBegin = new DateTime('2016-01-01 01:00:00');
        $secondEnd = new DateTime('2016-01-01 02:00:00');
        $secondDatePeriod = new DatePeriod($secondBegin, $interval, $secondEnd);
        
        assertThat(
            DatePeriodHelper::isOverlapped($firstDatePeriod, $secondDatePeriod),
            is(false)
        );
    }

    /** @test */
    public function isOverlapped_returns_true_when_both_period_is_same()
    {
        $interval = DateInterval::createFromDateString('1 hour');

        $begin = new DateTime('2016-01-01 01:00:00');
        $end = new DateTime('2016-01-01 02:00:00');
        $firstDatePeriod = new DatePeriod($begin, $interval, $end);

        $secondBegin = new DateTime('2016-01-01 01:00:00');
        $secondEnd = new DateTime('2016-01-01 02:00:00');
        $secondDatePeriod = new DatePeriod($secondBegin, $interval, $secondEnd);
        
        assertThat(
            DatePeriodHelper::isOverlapped($firstDatePeriod, $secondDatePeriod),
            is(true)
        );
    }

    /** @test */
    public function isOverlapped_returns_true_when_first_dateperiod_is_within_range_of_second_dateperiod()
    {
        $interval = DateInterval::createFromDateString('1 hour');

        $begin = new DateTime('2016-01-01 01:00:00');
        $end = new DateTime('2016-01-01 02:00:00');
        $firstDatePeriod = new DatePeriod($begin, $interval, $end);

        $secondBegin = new DateTime('2016-01-01 00:00:00');
        $secondEnd = new DateTime('2016-01-01 03:00:00');
        $secondDatePeriod = new DatePeriod($secondBegin, $interval, $secondEnd);
        
        assertThat(
            DatePeriodHelper::isOverlapped($firstDatePeriod, $secondDatePeriod),
            is(true)
        );
    }

    /** @test */
    public function isOverlapped_returns_true_when_first_dateperiod_start_date_is_in_scond_dateperiod()
    {
        $interval = DateInterval::createFromDateString('1 hour');

        $begin = new DateTime('2016-01-01 02:00:00');
        $end = new DateTime('2016-01-01 04:00:00');
        $firstDatePeriod = new DatePeriod($begin, $interval, $end);

        $secondBegin = new DateTime('2016-01-01 01:00:00');
        $secondEnd = new DateTime('2016-01-01 03:00:00');
        $secondDatePeriod = new DatePeriod($secondBegin, $interval, $secondEnd);
        
        assertThat(
            DatePeriodHelper::isOverlapped($firstDatePeriod, $secondDatePeriod),
            is(true)
        );
    }

    /** @test */
    public function isOverlapped_returns_true_when_first_dateperiod_end_date_is_in_second_dateperiod()
    {
        $interval = DateInterval::createFromDateString('1 hour');

        $begin = new DateTime('2016-01-01 00:00:00');
        $end = new DateTime('2016-01-01 02:00:00');
        $firstDatePeriod = new DatePeriod($begin, $interval, $end);

        $secondBegin = new DateTime('2016-01-01 01:00:00');
        $secondEnd = new DateTime('2016-01-01 03:00:00');
        $secondDatePeriod = new DatePeriod($secondBegin, $interval, $secondEnd);
        
        assertThat(
            DatePeriodHelper::isOverlapped($firstDatePeriod, $secondDatePeriod),
            is(true)
        );
    }

    /** @test */
    public function isOverlapped_returns_true_when_second_secondperiod_is_within_first_dateperiod()
    {
        $interval = DateInterval::createFromDateString('1 hour');

        $begin = new DateTime('2016-01-01 00:00:00');
        $end = new DateTime('2016-01-01 03:00:00');
        $firstDatePeriod = new DatePeriod($begin, $interval, $end);

        $secondBegin = new DateTime('2016-01-01 01:00:00');
        $secondEnd = new DateTime('2016-01-01 02:00:00');
        $secondDatePeriod = new DatePeriod($secondBegin, $interval, $secondEnd);
        
        assertThat(
            DatePeriodHelper::isOverlapped($firstDatePeriod, $secondDatePeriod),
            is(true)
        );
    }

}