wiki.techinc.nl/tests/phpunit/includes/TimeAdjustTest.php

<?php

use MediaWiki\MediaWikiServices;

class TimeAdjustTest extends MediaWikiLangTestCase {
	protected function setUp() {
		parent::setUp();
	}

	/**
	 * Test offset usage for a given Language::userAdjust
	 * @dataProvider dataUserAdjust
	 * @covers Language::userAdjust
	 */
	public function testUserAdjust( $date, $localTZoffset, $expected ) {
		$this->setMwGlobals( 'wgLocalTZoffset', $localTZoffset );

		$this->assertEquals(
			$expected,
			strval( MediaWikiServices::getInstance()->getContentLanguage()->
				userAdjust( $date, '' ) ),
			"User adjust {$date} by {$localTZoffset} minutes should give {$expected}"
		);
	}

	public static function dataUserAdjust() {
		return [
			[ '20061231235959', 0, '20061231235959' ],
			[ '20061231235959', 5, '20070101000459' ],
			[ '20061231235959', 15, '20070101001459' ],
			[ '20061231235959', 60, '20070101005959' ],
			[ '20061231235959', 90, '20070101012959' ],
			[ '20061231235959', 120, '20070101015959' ],
			[ '20061231235959', 540, '20070101085959' ],
			[ '20061231235959', -5, '20061231235459' ],
			[ '20061231235959', -30, '20061231232959' ],
			[ '20061231235959', -60, '20061231225959' ],
		];
	}
}