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PHPSessionHandlerTest::testSessionHandling fails on PHP 7.2 when run after PHPSessionHandlerTest::testInstall
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Description

aryeh@monoid:/var/www/html/w$ php7.0 tests/phpunit/phpunit.php tests/phpunit/includes/session/PHPSessionHandlerTest.php --filter 'testInstall|testSessionHandling'
Using PHP 7.0.32-1+ubuntu16.04.1+deb.sury.org+1
PHPUnit 6.5.13 by Sebastian Bergmann and contributors.

....                                                                4 / 4 (100%)

Time: 248 ms, Memory: 30.00MB

OK (4 tests, 65 assertions)
aryeh@monoid:/var/www/html/w$ php7.1 tests/phpunit/phpunit.php tests/phpunit/includes/session/PHPSessionHandlerTest.php --filter 'testInstall|testSessionHandling'
Using PHP 7.1.22-1+ubuntu16.04.1+deb.sury.org+1
PHPUnit 6.5.13 by Sebastian Bergmann and contributors.

....                                                                4 / 4 (100%)

Time: 408 ms, Memory: 30.00MB

OK (4 tests, 65 assertions)
aryeh@monoid:/var/www/html/w$ php7.2 tests/phpunit/phpunit.php tests/phpunit/includes/session/PHPSessionHandlerTest.php --filter 'testInstall|testSessionHandling'
Using PHP 7.2.10-1+ubuntu16.04.1+deb.sury.org+1
PHPUnit 6.5.13 by Sebastian Bergmann and contributors.

PHP Warning:  ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /var/www/html/w/tests/phpunit/includes/session/PHPSessionHandlerTest.php on line 79
PHP Stack trace:
PHP   1. {main}() /var/www/html/w/tests/phpunit/phpunit.php:0
PHP   2. require() /var/www/html/w/tests/phpunit/phpunit.php:129
PHP   3. PHPUnitMaintClass->execute() /var/www/html/w/maintenance/doMaintenance.php:94
PHP   4. MediaWikiPHPUnitCommand->run() /var/www/html/w/tests/phpunit/phpunit.php:90
PHP   5. MediaWikiTestRunner->doRun() /var/www/html/w/vendor/phpunit/phpunit/src/TextUI/Command.php:195
PHP   6. PHPUnit\Framework\TestSuite->run() /var/www/html/w/vendor/phpunit/phpunit/src/TextUI/TestRunner.php:545
PHP   7. MediaWiki\Session\PHPSessionHandlerTest->run() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestSuite.php:755
PHP   8. MediaWiki\Session\PHPSessionHandlerTest->run() /var/www/html/w/tests/phpunit/MediaWikiTestCase.php:416
PHP   9. MediaWikiTestResult->run() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:894
PHP  10. MediaWiki\Session\PHPSessionHandlerTest->runBare() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestResult.php:698
PHP  11. MediaWiki\Session\PHPSessionHandlerTest->runTest() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:939
PHP  12. ReflectionMethod->invokeArgs() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:1071
PHP  13. MediaWiki\Session\PHPSessionHandlerTest->testInstall() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:1071
PHP  14. ini_set() /var/www/html/w/tests/phpunit/includes/session/PHPSessionHandlerTest.php:79
PHP Warning:  ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /var/www/html/w/tests/phpunit/includes/session/PHPSessionHandlerTest.php on line 80
PHP Stack trace:
PHP   1. {main}() /var/www/html/w/tests/phpunit/phpunit.php:0
PHP   2. require() /var/www/html/w/tests/phpunit/phpunit.php:129
PHP   3. PHPUnitMaintClass->execute() /var/www/html/w/maintenance/doMaintenance.php:94
PHP   4. MediaWikiPHPUnitCommand->run() /var/www/html/w/tests/phpunit/phpunit.php:90
PHP   5. MediaWikiTestRunner->doRun() /var/www/html/w/vendor/phpunit/phpunit/src/TextUI/Command.php:195
PHP   6. PHPUnit\Framework\TestSuite->run() /var/www/html/w/vendor/phpunit/phpunit/src/TextUI/TestRunner.php:545
PHP   7. MediaWiki\Session\PHPSessionHandlerTest->run() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestSuite.php:755
PHP   8. MediaWiki\Session\PHPSessionHandlerTest->run() /var/www/html/w/tests/phpunit/MediaWikiTestCase.php:416
PHP   9. MediaWikiTestResult->run() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:894
PHP  10. MediaWiki\Session\PHPSessionHandlerTest->runBare() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestResult.php:698
PHP  11. MediaWiki\Session\PHPSessionHandlerTest->runTest() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:939
PHP  12. ReflectionMethod->invokeArgs() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:1071
PHP  13. MediaWiki\Session\PHPSessionHandlerTest->testInstall() /var/www/html/w/vendor/phpunit/phpunit/src/Framework/TestCase.php:1071
PHP  14. ini_set() /var/www/html/w/tests/phpunit/includes/session/PHPSessionHandlerTest.php:80
.SSE                                                                4 / 4 (100%)

Time: 249 ms, Memory: 32.25MB

There was 1 error:

1) MediaWiki\Session\PHPSessionHandlerTest::testSessionHandling with data set #2 ('php_serialize')
UnexpectedValueException: MediaWiki\Session\PHPSessionHandler::open: Wrong instance called!

/var/www/html/w/includes/session/PHPSessionHandler.php:180
/var/www/html/w/tests/phpunit/includes/session/PHPSessionHandlerTest.php:149
/var/www/html/w/tests/phpunit/MediaWikiTestCase.php:416
/var/www/html/w/maintenance/doMaintenance.php:94

ERRORS!
Tests: 4, Assertions: 8, Errors: 1, Skipped: 2.

This also causes a lot of tests afterwards to fail with "Trying to get property 'num_rows' of non-object" at DatabaseMysqli.php:233.

Details

Related Changes in Gerrit:
SubjectRepoBranchLines +/-
Call ob_start() before running testsmediawiki/coreREL1_31+4 -0
Call ob_start() before running testsmediawiki/coremaster+4 -0
Output only to stderr in unit testsmediawiki/coreREL1_31+3 -11
Output only to stderr in unit testsmediawiki/coremaster+5 -11
Customize query in gerrit

Related Objects

Event Timeline

Simetrical created this task.Oct 8 2018, 4:59 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptOct 8 2018, 4:59 PM
Framawiki added a project: MediaWiki-Core-Tests.Oct 8 2018, 5:01 PM
Simetrical added a comment.Oct 8 2018, 5:02 PM

I'm trying to bisect now to see if this is a regression. If headers are already sent, that seems like a problem?

Simetrical added a comment.Oct 8 2018, 5:08 PM

A revision from 2017 had the same problem, so it's safe to assume this isn't a regression in MediaWiki.

Simetrical added a comment.Oct 8 2018, 5:10 PM

The "Headers already sent" is just because capitalization changed in PHP 7.2 and evaded our error suppression, so that's presumably not related.

Simetrical added a comment.Oct 8 2018, 5:50 PM

Looks like it's this: https://bugs.php.net/bug.php?id=75628 Seems we have to make sure this test actually doesn't output anything.

gerritbot subscribed.Oct 8 2018, 6:06 PM

Change 465201 had a related patch set uploaded (by simetrical; owner: simetrical):
[mediawiki/core@master] Output only to stderr in unit tests

https://gerrit.wikimedia.org/r/465201

gerritbot added a project: Patch-For-Review.Oct 8 2018, 6:06 PM
Legoktm added a project: PHP 7.2 support.Oct 9 2018, 6:12 AM
Krinkle moved this task from Untriaged to MediaWiki core on the PHP 7.2 support board.Oct 12 2018, 6:47 PM
Legoktm assigned this task to Simetrical.Oct 13 2018, 6:15 AM
gerritbot added a comment.Oct 13 2018, 6:29 AM

Change 465201 merged by jenkins-bot:
[mediawiki/core@master] Output only to stderr in unit tests

https://gerrit.wikimedia.org/r/465201

Legoktm closed this task as Resolved.Oct 13 2018, 6:33 AM
Legoktm merged a task: T182379: Test failures from PHPSessionHandlerTest in PHP 7.2.Oct 13 2018, 6:43 AM
Legoktm added subscribers: Reedy, Anomie, • Tgr and 3 others.
ReleaseTaggerBot added a project: MW-1.32-notes (WMF-deploy-2018-10-16 (1.32.0-wmf.26)).Oct 13 2018, 7:00 AM
Krinkle merged tasks: T196792: MediaWiki\Session\PHPSessionHandler::open: Wrong instance called, T197030: Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in /srv/mediawiki/w/includes/session/PHPSessionHandler.php on line 126.Oct 14 2018, 10:52 PM
Krinkle awarded a token.
Krinkle moved this task from Inbox to PHPUnit on the MediaWiki-Core-Tests board.
gerritbot added a comment.Oct 16 2018, 12:47 AM

Change 467549 had a related patch set uploaded (by Legoktm; owner: simetrical):
[mediawiki/core@REL1_31] Output only to stderr in unit tests

https://gerrit.wikimedia.org/r/467549

gerritbot added a comment.Oct 16 2018, 1:16 AM

Change 467549 merged by jenkins-bot:
[mediawiki/core@REL1_31] Output only to stderr in unit tests

https://gerrit.wikimedia.org/r/467549

ReleaseTaggerBot added a project: MW-1.31-release-notes.Oct 16 2018, 2:00 AM
tstarling subscribed.May 25 2020, 3:56 AM

I came across a variation of this today at https://gerrit.wikimedia.org/r/c/mediawiki/extensions/TEI/+/597681 . The problem is that an implicit policy of not sending output to stdout creates a non-obvious failure mode in which one test breaks another. Today's problem involves CI being configured with display_errors=1, causing headers to be sent when wfDeprecated() is called from a data provider.

Calling ob_start() sufficiently early fixes the problem. I'm documenting this here since I'll reference this task in my commit.

gerritbot added a comment.May 25 2020, 3:57 AM

Change 598293 had a related patch set uploaded (by Tim Starling; owner: Tim Starling):
[mediawiki/core@master] Call ob_start() before running tests

https://gerrit.wikimedia.org/r/598293

gerritbot added a comment.May 29 2020, 2:56 AM

Change 598293 merged by jenkins-bot:
[mediawiki/core@master] Call ob_start() before running tests

https://gerrit.wikimedia.org/r/598293

ReleaseTaggerBot added a project: MW-1.35-notes (1.35.0-wmf.35; 2020-06-02).May 29 2020, 3:00 AM
Maintenance_bot removed a project: Patch-For-Review.May 29 2020, 3:10 AM
gerritbot added a comment.Jun 1 2020, 7:29 PM

Change 601397 had a related patch set uploaded (by SBassett; owner: Tim Starling):
[mediawiki/core@REL1_31] Call ob_start() before running tests

https://gerrit.wikimedia.org/r/601397

gerritbot added a project: Patch-For-Review.Jun 1 2020, 7:29 PM
gerritbot added a comment.Jun 1 2020, 7:58 PM

Change 601397 merged by jenkins-bot:
[mediawiki/core@REL1_31] Call ob_start() before running tests

https://gerrit.wikimedia.org/r/601397

Maintenance_bot removed a project: Patch-For-Review.Jun 1 2020, 8:10 PM
Aklapper removed a subscriber: Anomie.Oct 16 2020, 5:38 PM
Daimona mentioned this in T420009: See if it's possible to run PHPUnit tests without `stderr=true` and without `ob_start`.Mar 13 2026, 3:06 PM
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