Ensure that process isolation works with PHP 8.3

[sebastianbergmann]

PHPUnit 8.5

PHPUnit 8.5.33-19-g22c8daa475 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.3.0-dev
Configuration: /usr/local/src/phpunit/phpunit.xml

F                                                                   1 / 1 (100%)

Time: 365 ms, Memory: 4.00 MB

There was 1 failure:

1) /usr/local/src/phpunit/tests/end-to-end/regression/1348.phpt
Failed asserting that string matches format description.
--- Expected
+++ Actual
@@ @@
 PHPUnit 8.5.33-19-g22c8daa475 by Sebastian Bergmann and contributors.
 
-.
-STDOUT does not break test result
-E                                                                  2 / 2 (100%)
+EE                                                                  2 / 2 (100%)
 
-Time: %s, Memory: %s
+Time: 177 ms, Memory: 6.00 MB
 
-There was 1 error:
+There were 2 errors:
 
-1) Issue1348Test::testSTDERR
+1) Issue1348Test::testSTDOUT
+PHPUnit\Framework\Exception: STDOUT does not break test result
+a:4:{s:10:"testResult";N;s:13:"numAssertions";i:1;s:6:"result";O:28:"PHPUnit\Framework\TestResult":35:{s:36:"PHPUnit\Framework\TestResultpassed";a:1:{s:25:"Issue1348Test::testSTDOUT";a:2:{s:6:"result";N;s:4:"size";i:-1;}}s:36:"PHPUnit\Framework\TestResulterrors";a:0:{}s:38:"PHPUnit\Framework\TestResultfailures";a:0:{}s:38:"PHPUnit\Framework\TestResultwarnings";a:0:{}s:44:"PHPUnit\Framework\TestResultnotImplemented";a:0:{}s:35:"PHPUnit\Framework\TestResultrisky";a:0:{}s:37:"PHPUnit\Framework\TestResultskipped";a:0:{}s:39:"PHPUnit\Framework\TestResultlisteners";a:0:{}s:38:"PHPUnit\Framework\TestResultrunTests";i:1;s:34:"PHPUnit\Framework\TestResulttime";d:0.0015439987182617188;s:42:"PHPUnit\Framework\TestResulttopTestSuite";N;s:42:"PHPUnit\Framework\TestResultcodeCoverage";N;s:61:"PHPUnit\Framework\TestResultconvertDeprecationsToExceptions";b:0;s:55:"PHPUnit\Framework\TestResultconvertErrorsToExceptions";b:1;s:56:"PHPUnit\Framework\TestResultconvertNoticesToExceptions";b:1;s:57:"PHPUnit\Framework\TestResultconvertWarningsToExceptions";b:1;s:34:"PHPUnit\Framework\TestResultstop";b:0;s:41:"PHPUnit\Framework\TestResultstopOnError";b:0;s:43:"PHPUnit\Framework\TestResultstopOnFailure";b:0;s:43:"PHPUnit\Framework\TestResultstopOnWarning";b:0;s:69:"PHPUnit\Framework\TestResultbeStrictAboutTestsThatDoNotTestAnything";b:1;s:60:"PHPUnit\Framework\TestResultbeStrictAboutOutputDuringTests";b:0;s:61:"PHPUnit\Framework\TestResultbeStrictAboutTodoAnnotatedTests";b:0;s:72:"PHPUnit\Framework\TestResultbeStrictAboutResourceUsageDuringSmallTests";b:0;s:46:"PHPUnit\Framework\TestResultenforceTimeLimit";b:0;s:50:"PHPUnit\Framework\TestResulttimeoutForSmallTests";i:1;s:51:"PHPUnit\Framework\TestResulttimeoutForMediumTests";i:10;s:50:"PHPUnit\Framework\TestResulttimeoutForLargeTests";i:60;s:41:"PHPUnit\Framework\TestResultstopOnRisky";b:0;s:46:"PHPUnit\Framework\TestResultstopOnIncomplete";b:0;s:43:"PHPUnit\Framework\TestResultstopOnSkipped";b:0;s:44:"PHPUnit\Framework\TestResultlastTestFailed";b:0;s:46:"PHPUnit\Framework\TestResultdefaultTimeLimit";i:0;s:42:"PHPUnit\Framework\TestResultstopOnDefect";b:0;s:77:"PHPUnit\Framework\TestResultregisterMockObjectsFromTestArgumentsRecursively";b:0;}s:6:"output";s:0:"";}
+
+Caused by
+ErrorException: unserialize(): Error at offset 0 of 2331 bytes in /usr/local/src/phpunit/src/Util/PHP/AbstractPhpProcess.php:289
+Stack trace:
+#0 [internal function]: PHPUnit\Util\PHP\AbstractPhpProcess::PHPUnit\Util\PHP\{closure}(2, 'unserialize(): ...', '/usr/local/src/...', 289)
+#1 /usr/local/src/phpunit/src/Util/PHP/AbstractPhpProcess.php(289): unserialize('\nSTDOUT does no...')
+#2 /usr/local/src/phpunit/src/Util/PHP/AbstractPhpProcess.php(183): PHPUnit\Util\PHP\AbstractPhpProcess->processChildResult(Object(Issue1348Test), Object(PHPUnit\Framework\TestResult), '\nSTDOUT does no...', '')
+#3 /usr/local/src/phpunit/src/Framework/TestCase.php(836): PHPUnit\Util\PHP\AbstractPhpProcess->runTestJob('<?php\nuse PHPUn...', Object(Issue1348Test), Object(PHPUnit\Framework\TestResult))
+#4 /usr/local/src/phpunit/src/Framework/TestSuite.php(622): PHPUnit\Framework\TestCase->run(Object(PHPUnit\Framework\TestResult))
+#5 /usr/local/src/phpunit/src/TextUI/TestRunner.php(645): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
+#6 /usr/local/src/phpunit/src/TextUI/Command.php(235): PHPUnit\TextUI\TestRunner->doRun(Object(PHPUnit\Framework\TestSuite), Array, Array, true)
+#7 /usr/local/src/phpunit/src/TextUI/Command.php(194): PHPUnit\TextUI\Command->run(Array, true)
+#8 Standard input code(8): PHPUnit\TextUI\Command::main()
+#9 {main}
+
+2) Issue1348Test::testSTDERR
 PHPUnit\Framework\Exception: STDERR works as usual.
 
 ERRORS!
-Tests: 2, Assertions: 1, Errors: 1.
+Tests: 2, Assertions: 0, Errors: 2.

/usr/local/src/phpunit/tests/end-to-end/regression/1348.phpt:18
/usr/local/src/phpunit/src/Framework/TestSuite.php:622
/usr/local/src/phpunit/src/TextUI/TestRunner.php:645
/usr/local/src/phpunit/src/TextUI/Command.php:235
/usr/local/src/phpunit/src/TextUI/Command.php:194

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

PHPUnit 9.6

PHPUnit 9.6.7-5-g71b53aef43 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.3.0-dev
Configuration: /usr/local/src/phpunit/phpunit.xml

F                                                                   1 / 1 (100%)

Time: 00:00.236, Memory: 8.00 MB

There was 1 failure:

1) /usr/local/src/phpunit/tests/end-to-end/regression/1348.phpt
Failed asserting that string matches format description.
--- Expected
+++ Actual
@@ @@
 PHPUnit 9.6.7-5-g71b53aef43 by Sebastian Bergmann and contributors.
 
-.
-STDOUT does not break test result
-E                                                                  2 / 2 (100%)
+EE                                                                  2 / 2 (100%)
 
-Time: %s, Memory: %s
+Time: 00:00.111, Memory: 6.00 MB
 
-There was 1 error:
+There were 2 errors:
 
-1) Issue1348Test::testSTDERR
+1) Issue1348Test::testSTDOUT
+PHPUnit\Framework\Exception: STDOUT does not break test result
+a:4:{s:10:"testResult";N;s:13:"numAssertions";i:1;s:6:"result";O:28:"PHPUnit\Framework\TestResult":37:{s:36:"PHPUnit\Framework\TestResultpassed";a:1:{s:25:"Issue1348Test::testSTDOUT";a:2:{s:6:"result";N;s:4:"size";i:-1;}}s:47:"PHPUnit\Framework\TestResultpassedTestClasses";a:0:{}s:52:"PHPUnit\Framework\TestResultcurrentTestSuiteFailed";b:0;s:36:"PHPUnit\Framework\TestResulterrors";a:0:{}s:38:"PHPUnit\Framework\TestResultfailures";a:0:{}s:38:"PHPUnit\Framework\TestResultwarnings";a:0:{}s:44:"PHPUnit\Framework\TestResultnotImplemented";a:0:{}s:35:"PHPUnit\Framework\TestResultrisky";a:0:{}s:37:"PHPUnit\Framework\TestResultskipped";a:0:{}s:39:"PHPUnit\Framework\TestResultlisteners";a:0:{}s:38:"PHPUnit\Framework\TestResultrunTests";i:1;s:34:"PHPUnit\Framework\TestResulttime";d:0.002838104;s:42:"PHPUnit\Framework\TestResultcodeCoverage";N;s:61:"PHPUnit\Framework\TestResultconvertDeprecationsToExceptions";b:0;s:55:"PHPUnit\Framework\TestResultconvertErrorsToExceptions";b:1;s:56:"PHPUnit\Framework\TestResultconvertNoticesToExceptions";b:1;s:57:"PHPUnit\Framework\TestResultconvertWarningsToExceptions";b:1;s:34:"PHPUnit\Framework\TestResultstop";b:0;s:41:"PHPUnit\Framework\TestResultstopOnError";b:0;s:43:"PHPUnit\Framework\TestResultstopOnFailure";b:0;s:43:"PHPUnit\Framework\TestResultstopOnWarning";b:0;s:69:"PHPUnit\Framework\TestResultbeStrictAboutTestsThatDoNotTestAnything";b:1;s:60:"PHPUnit\Framework\TestResultbeStrictAboutOutputDuringTests";b:0;s:61:"PHPUnit\Framework\TestResultbeStrictAboutTodoAnnotatedTests";b:0;s:72:"PHPUnit\Framework\TestResultbeStrictAboutResourceUsageDuringSmallTests";b:0;s:46:"PHPUnit\Framework\TestResultenforceTimeLimit";b:0;s:51:"PHPUnit\Framework\TestResultforceCoversAnnotation";b:0;s:50:"PHPUnit\Framework\TestResulttimeoutForSmallTests";i:1;s:51:"PHPUnit\Framework\TestResulttimeoutForMediumTests";i:10;s:50:"PHPUnit\Framework\TestResulttimeoutForLargeTests";i:60;s:41:"PHPUnit\Framework\TestResultstopOnRisky";b:0;s:46:"PHPUnit\Framework\TestResultstopOnIncomplete";b:0;s:43:"PHPUnit\Framework\TestResultstopOnSkipped";b:0;s:44:"PHPUnit\Framework\TestResultlastTestFailed";b:0;s:46:"PHPUnit\Framework\TestResultdefaultTimeLimit";i:0;s:42:"PHPUnit\Framework\TestResultstopOnDefect";b:0;s:77:"PHPUnit\Framework\TestResultregisterMockObjectsFromTestArgumentsRecursively";b:0;}s:6:"output";s:0:"";}
+
+Caused by
+ErrorException: unserialize(): Error at offset 0 of 2457 bytes in /usr/local/src/phpunit/src/Util/PHP/AbstractPhpProcess.php:289
+Stack trace:
+#0 [internal function]: PHPUnit\Util\PHP\AbstractPhpProcess::PHPUnit\Util\PHP\{closure}(2, 'unserialize(): ...', '/usr/local/src/...', 289)
+#1 /usr/local/src/phpunit/src/Util/PHP/AbstractPhpProcess.php(289): unserialize('\nSTDOUT does no...')
+#2 /usr/local/src/phpunit/src/Util/PHP/AbstractPhpProcess.php(183): PHPUnit\Util\PHP\AbstractPhpProcess->processChildResult(Object(Issue1348Test), Object(PHPUnit\Framework\TestResult), '\nSTDOUT does no...', '')
+#3 /usr/local/src/phpunit/src/Framework/TestCase.php(962): PHPUnit\Util\PHP\AbstractPhpProcess->runTestJob('<?php\nuse PHPUn...', Object(Issue1348Test), Object(PHPUnit\Framework\TestResult))
+#4 /usr/local/src/phpunit/src/Framework/TestSuite.php(684): PHPUnit\Framework\TestCase->run(Object(PHPUnit\Framework\TestResult))
+#5 /usr/local/src/phpunit/src/TextUI/TestRunner.php(651): PHPUnit\Framework\TestSuite->run(Object(PHPUnit\Framework\TestResult))
+#6 /usr/local/src/phpunit/src/TextUI/Command.php(144): PHPUnit\TextUI\TestRunner->run(Object(PHPUnit\Framework\TestSuite), Array, Array, true)
+#7 /usr/local/src/phpunit/src/TextUI/Command.php(97): PHPUnit\TextUI\Command->run(Array, true)
+#8 Standard input code(8): PHPUnit\TextUI\Command::main()
+#9 {main}
+
+2) Issue1348Test::testSTDERR
 PHPUnit\Framework\Exception: STDERR works as usual.
 
 ERRORS!
-Tests: 2, Assertions: 1, Errors: 1.
+Tests: 2, Assertions: 0, Errors: 2.

/usr/local/src/phpunit/tests/end-to-end/regression/1348.phpt:18
/usr/local/src/phpunit/src/Framework/TestSuite.php:684
/usr/local/src/phpunit/src/TextUI/TestRunner.php:651
/usr/local/src/phpunit/src/TextUI/Command.php:144
/usr/local/src/phpunit/src/TextUI/Command.php:97

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

PHPUnit 10.1

PHPUnit 10.1.2-13-gb54dec3557 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.3.0-dev
Configuration: /usr/local/src/phpunit/phpunit.xml

F                                                                   1 / 1 (100%)

Time: 00:00.356, Memory: 8.00 MB

There was 1 failure:

1) /usr/local/src/phpunit/tests/end-to-end/regression/1348.phpt
Failed asserting that string matches format description.
--- Expected
+++ Actual
@@ @@
 
 Runtime:       PHP 8.3.0-dev
 
-.
-STDOUT does not break test result
-E                                                                  2 / 2 (100%)
+EE                                                                  2 / 2 (100%)
 
-Time: %s, Memory: %s
+Time: 00:00.136, Memory: 6.00 MB
 
-There was 1 error:
+There were 2 errors:
 
-1) PHPUnit\TestFixture\Issue1348Test::testSTDERR
+1) PHPUnit\TestFixture\Issue1348Test::testSTDOUT
+PHPUnit\Framework\Exception: STDOUT does not break test result
+a:6:{s:10:"testResult";N;s:12:"codeCoverage";N;s:13:"numAssertions";i:1;s:6:"output";s:0:"";s:6:"events";O:29:"PHPUnit\Event\EventCollection":1:{s:37:"PHPUnit\Event\EventCollectionevents";a:5:{i:0;O:37:"PHPUnit\Event\Test\PreparationStarted":2:{s:52:"PHPUnit\Event\Test\PreparationStartedtelemetryInfo";O:28:"PHPUnit\Event\Telemetry\Info":5:{s:37:"PHPUnit\Event\Telemetry\Infocurrent";O:32:"PHPUnit\Event\Telemetry\Snapshot":4:{s:38:"PHPUnit\Event\Telemetry\Snapshottime";O:30:"PHPUnit\Event\Telemetry\HRTime":2:{s:39:"PHPUnit\Event\Telemetry\HRTimeseconds";i:15122;s:43:"PHPUnit\Event\Telemetry\HRTimenanoseconds";i:68315310;}s:45:"PHPUnit\Event\Telemetry\SnapshotmemoryUsage";O:35:"PHPUnit\Event\Telemetry\MemoryUsage":1:{s:42:"PHPUnit\Event\Telemetry\MemoryUsagebytes";i:4194304;}s:49:"PHPUnit\Event\Telemetry\SnapshotpeakMemoryUsage";O:35:"PHPUnit\Event\Telemetry\MemoryUsage":1:{s:42:"PHPUnit\Event\Telemetry\MemoryUsagebytes";i:4194304;}s:56:"PHPUnit\Event\Telemetry\SnapshotgarbageCollectorStatus";O:46:"PHPUnit\Event\Telemetry\GarbageCollectorStatus":8:{s:52:"PHPUnit\Event\Telemetry\GarbageCollectorStatusruns";i:0;s:57:"PHPUnit\Event\Telemetry\GarbageCollectorStatuscollected";i:0;s:57:"PHPUnit\Event\Telemetry\GarbageCollectorStatusthreshold";i:10001;s:53:"PHPUnit\Event\Telemetry\GarbageCollectorStatusroots";i:63;s:55:"PHPUnit\Event\Telemetry\GarbageCollectorStatusrunning";b:0;s:57:"PHPUnit\Event\Telemetry\GarbageCollectorStatusprotected";b:0;s:52:"PHPUnit\Event\Telemetry\GarbageCollectorStatusfull";b:0;s:58:"PHPUnit\Event\Telemetry\GarbageCollectorStatusbufferSize";i:16384;}}s:48:"PHPUnit\Event\Telemetry\InfodurationSinceStart";O:32:"PHPUnit\Event\Telemetry\Duration":2:{s:41:"PHPUnit\Event\Telemetry\Durationseconds";i:0;s:45:"PHPUnit\Event\Telemetry\Durationnanoseconds";i:65000154;}s:46:"PHPUnit\Event\Telemetry\InfomemorySinceStart";O:35:"PHPUnit\Event\Telemetry\MemoryUsage":1:{s:42:"PHPUnit\Event\Telemetry\MemoryUsagebytes";i:0;}s:51:"PHPUnit\Event\Telemetry\InfodurationSincePrevious";O:32:"PHPUnit\Event\Telemetry\Duration":2:{s:41:"PHPUnit\Event\Telemetry\Durationseconds";i:0;s:45:"PHPUnit\Event\Telemetry\Durationnanoseconds";i:4615517;}s:49:"PHPUnit\Event\Telemetry\InfomemorySincePrevious";O:35:"PHPUnit\Event\Telemetry\MemoryUsage":1:{s:42:"PHPUnit\Event\Telemetry\MemoryUsagebytes";i:0;}}s:43:"PHPUnit\Event\Test\PreparationStartedtest";O:29:"PHPUnit\Event\Code\TestMethod":7:{s:29:"PHPUnit\Event\Code\Testfile";s:73:"/usr/local/src/phpunit/tests/end-to-end/regression/1348/Issue1348Test.php";s:40:"PHPUnit\Event\Code\TestMethodclassName";s:33:"PHPUnit\TestFixture\Issue1348Test";s:41:"PHPUnit\Event\Code\TestMethodmethodName";s:10:"testSTDOUT";s:35:"PHPUnit\Event\Code\TestMethodline";i:19;s:38:"PHPUnit\Event\Code\TestMethodtestDox";O:26:"PHPUnit\Event\Code\TestDox":3:{s:47:"PHPUnit\Event\Code\TestDoxprettifiedClassName";s:41:"Issue1348 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+
+Caused by
+ErrorException: unserialize(): Error at offset 0 of 14069 bytes
+
+2) PHPUnit\TestFixture\Issue1348Test::testSTDERR
 PHPUnit\Framework\Exception: STDERR works as usual.
 
 ERRORS!
-Tests: 2, Assertions: 1, Errors: 1.
+Tests: 2, Assertions: 0, Errors: 2.

/usr/local/src/phpunit/tests/end-to-end/regression/1348.phpt:18
/usr/local/src/phpunit/src/Framework/TestSuite.php:357
/usr/local/src/phpunit/src/TextUI/TestRunner.php:63
/usr/local/src/phpunit/src/TextUI/Application.php:168

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

[sebastianbergmann]

Identified the change in PHP 8.3 that causes this using git bisect: php/php-src@f6c0c60 (php/php-src#11169) by @nielsdos.

[nielsdos]

Huh, I certainly did not expect BC breaks from that change.
In any case, I had a look at this. It seems that you send the test results via stdout, and then deserialize it. The tests fail because the string "\nSTDOUT does not break test result\n" is now sent to stdout, which causes the unserialization to break.

I see that you override STDOUT and STDERR if they're not defined yet:

if (!defined('STDOUT')) {
    define('STDOUT', fopen('php://temp', 'w+b'));
    define('STDERR', fopen('php://stderr', 'wb'));
}

But since we now always define those, this breaks.

As a side note I found that the following breaks even in current versions of PHP:

$f = fopen("php://stdout", "w");
fwrite($f, "abc");
fclose($f);

As for a solution I see three options:

1. Revert the fix in php-src.
2. Add an option to the CLI SAPI to bypass defining those constants.
3. When you launch the process from within phpunit, perform output redirection at the process level instead of within PHP. This will fix this regression and also fix the problematic case I gave. I'm not sure how easy (if possible) this is to implement though, I only had a very brief look at phpunit's source code.

Let me know what you think. cc @iluuu1994

[iluuu1994]

Add an option to the CLI SAPI to bypass defining those constants.

I think we should avoid options with very rare use-cases.

When you launch the process from within phpunit, perform output redirection at the process level instead of within PHP.

This does sound like a more robust solution. The fact that these FD constants were missing seems more like an oversight, rather than a conscious design decision.

@sebastianbergmann WDYT? Can you trivially change this? If this causes issues for you, then of course reverting this is no problem.

[sebastianbergmann]

All the more reason then to reimplement process isolation (#5290). Thanks!

[sebastianbergmann]

I discussed this with @theseer today and we came to the following conclusions:

• Running tests in isolated processes works just fine in PHP 8.3 and with the changes mentioned in Ensure that process isolation works with PHP 8.3 #5356 (comment).

• The only test for PHPUnit's process isolation feature that started failing with php/php-src@f6c0c60, tests/end-to-end/regression/1348.phpt, is a regression test for STDOUT/STDERR IO streams do not exist in process isolation #1348.

• In this regression test for STDOUT/STDERR IO streams do not exist in process isolation #1348, output is directly written to STDOUT using fwrite(). This bypasses PHP's output buffering system as well as PHPUnit's regular means for capturing output.

• Prior to php/php-src@f6c0c60, PHPUnit's process isolation feature allowed to capture writes to standard output by redirecting STDOUT to php://temp. This is no longer possible starting with PHP 8.3.