run-tests.sh cannot handle unicode in PHPUnit output

Note this does not happen for core tests only contrib because they are using the --xml flag and core is not. If you make a test fail and use the following flags on a test you will see the error --verbose --xml tmp --class '\\Drupal\\Tests\\Core\\Access\\AccessManagerTest'

For example:

$ php ./core/scripts/run-tests.sh --php /opt/homebrew/bin/php --sqlite /tmp/coretest.sqlite --dburl mysql://USER:PASSWORD@localhost/drupal8alt --color --non-html --url http://drupal8alt.test/ --verbose --xml tmp --class '\\Drupal\\Tests\\Core\\Access\\AccessManagerTest'

Drupal test run
Using PHP Binary: /opt/homebrew/bin/php
---------------

Tests to be run:
  - \Drupal\Tests\Core\Access\AccessManagerTest

Test run started:
  Tuesday, January 14, 2025 - 09:54

Test summary
------------

\Drupal\Tests\Core\Access\AccessManagerTest                    0 passes    1s   1 fails

Test run duration: 0 sec

Detailed test results
---------------------


---- \Drupal\Tests\Core\Access\AccessManagerTest ----


Status    Group      Filename          Line Function
--------------------------------------------------------------------------------
Fail      Other      phpunit-7.xml        0 \Drupal\Tests\Core\Access\AccessMan
    PHPUnit Test failed to complete; Error: PHPUnit 10.5.38 by Sebastian Bergmann and contributors.

    Runtime:       PHP 8.3.14
    Configuration: /Volumes/dev/sites/drupal8alt.dev/core/phpunit.xml.dist

    F.................                                                18 / 18 (100%)

    Time: 00:00.034, Memory: 16.00 MB

    Access Manager (Drupal\Tests\Core\Access\AccessManager)
     ✘ Set checks
       ┐
       ├ Failed asserting that true is false.
       │
       │ /Volumes/dev/sites/drupal8alt.dev/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php:136
       ┴
     ✔ Set checks with dynamic access checker
     ✔ Check
     ✔ Check with null account
     ✔ Check conjunctions with data set 0
     ✔ Check conjunctions with data set 1
     ✔ Check conjunctions with data set 2
     ✔ Check conjunctions with data set 3
     ✔ Check conjunctions with data set 4
     ✔ Check conjunctions with data set 5
     ✔ Check named route
     ✔ Check named route with upcasted values
     ✔ Check named route with default value
     ✔ Check named route with non existing route
     ✔ Check exception with data set 0
     ✔ Check exception with data set 1
     ✔ Check exception with data set 2
     ✔ Check exception with data set 3

    FAILURES!
    Tests: 18, Assertions: 62, Failures: 1.
PHP Warning:  DOMDocument::saveXML(): xmlEscapeEntities : char out of range in /Volumes/dev/sites/drupal8alt.dev/core/scripts/run-tests.sh on line 1316

Warning: DOMDocument::saveXML(): xmlEscapeEntities : char out of range in /Volumes/dev/sites/drupal8alt.dev/core/scripts/run-tests.sh on line 1316

Fortunately the fix is very simple.

Locate the relevant line in run-tests.sh (near DOMDocument::saveXML) and update it to include the encoding explicitly:

$dom = new DOMDocument('1.0', 'UTF-8');
$dom->formatOutput = true;

This ensures that Unicode characters, such as emojis, are processed correctly by DOMDocument.

Simple enough.

I don't think we test the tester.

Committed/pushed to 11.x, thanks!

catch → closed merge request !10899

Created https://git.drupalcode.org/project/drupal/-/merge_requests/10912 to handle backport to 11.1.x and further...

Committed/pushed to 11.1.x and cherry-picked to 10.5.x and 10.4.x, thanks!

catch → closed merge request !10912