There was 1 error:

1) TwoColConflict\Tests\TwoColConflictHooksTest::testOnEditPageShowEditFormFields
strtolower(): Passing null to parameter #1 ($string) of type string is deprecated

/srv/mw/core/includes/context/RequestContext.php:396
/srv/mw/core/includes/context/RequestContext.php:465
/srv/mw/core/includes/language/Message.php:385
/srv/mw/core/includes/language/Message.php:984
/srv/mw/core/includes/language/Message.php:1054
/srv/mw/extensions/TwoColConflict/includes/Html/CoreUiHintHtml.php:37
/srv/mw/extensions/TwoColConflict/includes/Hooks/TwoColConflictHooks.php:139
/srv/mw/extensions/TwoColConflict/includes/Hooks/TwoColConflictHooks.php:124
/srv/mw/extensions/TwoColConflict/tests/phpunit/TwoColConflictHooksTest.php:300
/srv/mw/core/tests/phpunit/MediaWikiIntegrationTestCase.php:518
=== Logs generated by test case
[objectcache] [debug] MainWANObjectCache using store {class} {"class":"EmptyBagOStuff"}
[localisation] [debug] LocalisationCache using store LCStoreNull []
[objectcache] [debug] MainWANObjectCache using store {class} {"class":"EmptyBagOStuff"}
===

--

There was 1 failure:

1) TwoColConflict\Tests\AnnotatedHtmlDiffFormatterTest::testFormat with data set #9 ('Just a multi-line text.\nLine...above.', 'Just a multi-line text.\nAdd ...stuff.', array(array('copy', 'Just a multi-line text.'), array('change', 'Line number two. <del class=".../del>.', 'Line number two. This line is...above.', '<ins class="mw-twocolconflict.../ins>.', 'Add something new.\nLine numb...stuff.')))
Failed asserting that two arrays are identical.
--- Expected
+++ Actual
@@ @@
     1 => Array &2 (
         'action' => 'change'
         'oldhtml' => 'Line number two. <del class="mw-twocolconflict-diffchange">This </del>line <del class="mw-twocolconflict-diffchange">is </del>quite long!\n
-<del class="mw-twocolconflict-diffchange">And that's line number three - even longer than the line before.</del>\n
+<del class="mw-twocolconflict-diffchange">And that&#039;s line number three - even longer than the line before.</del>\n
  \n
 <del class="mw-twocolconflict-diffchange">Just another line with an empty line above</del>.'
         'oldtext' => 'Line number two. This line is quite long!\n

/srv/mw/extensions/TwoColConflict/tests/phpunit/unit/AnnotatedHtmlDiffFormatterTest.php:28
/srv/mw/core/tests/phpunit/MediaWikiUnitTestCase.php:116