The extension is using old API message formats, these should be replaced with i18n messages with entries in en.json and qqq.json
See https://www.mediawiki.org/wiki/API:Localisation for more information. Looking at many other extensions will also provide working examples. Such as https://github.com/wikimedia/mediawiki-extensions-CodeReview/blob/master/api/ApiCodeDiff.php#L73-L95 along with https://github.com/wikimedia/mediawiki-extensions-CodeReview/blob/master/i18n/en.json#L192-L195 and https://github.com/wikimedia/mediawiki-extensions-CodeReview/blob/master/i18n/qqq.json#L218-L221
21:16:57 1) ApiDocumentationTest::testDocumentationExists with data set "Module socialprofile-delete-message with MiserMode=false, AllowCategorizedRecentChanges=false" ('socialprofile-delete-message', array(false, false))
21:16:57 Module description message apihelp-socialprofile-delete-message-description exists
21:16:57 Failed asserting that false is true.
21:16:57
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:51
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:80
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/MediaWikiTestCase.php:399
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/maintenance/doMaintenance.php:111
21:16:57
21:16:57 2) ApiDocumentationTest::testDocumentationExists with data set "Module socialprofile-delete-message with MiserMode=true, AllowCategorizedRecentChanges=true" ('socialprofile-delete-message', array(true, true))
21:16:57 Module description message apihelp-socialprofile-delete-message-description exists
21:16:57 Failed asserting that false is true.
21:16:57
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:51
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:80
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/MediaWikiTestCase.php:399
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/maintenance/doMaintenance.php:111
21:16:57
21:16:57 3) ApiDocumentationTest::testDocumentationExists with data set "Module socialprofile-send-message with MiserMode=false, AllowCategorizedRecentChanges=false" ('socialprofile-send-message', array(false, false))
21:16:57 Module description message apihelp-socialprofile-send-message-description exists
21:16:57 Failed asserting that false is true.
21:16:57
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:51
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:80
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/MediaWikiTestCase.php:399
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/maintenance/doMaintenance.php:111
21:16:57
21:16:57 4) ApiDocumentationTest::testDocumentationExists with data set "Module socialprofile-send-message with MiserMode=true, AllowCategorizedRecentChanges=true" ('socialprofile-send-message', array(true, true))
21:16:57 Module description message apihelp-socialprofile-send-message-description exists
21:16:57 Failed asserting that false is true.
21:16:57
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:51
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:80
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/MediaWikiTestCase.php:399
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/maintenance/doMaintenance.php:111
21:16:57
21:16:57 5) ApiDocumentationTest::testDocumentationExists with data set "Module socialprofile-request-response with MiserMode=false, AllowCategorizedRecentChanges=false" ('socialprofile-request-response', array(false, false))
21:16:57 Module description message apihelp-socialprofile-request-response-description exists
21:16:57 Failed asserting that false is true.
21:16:57
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:51
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:80
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/MediaWikiTestCase.php:399
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/maintenance/doMaintenance.php:111
21:16:57
21:16:57 6) ApiDocumentationTest::testDocumentationExists with data set "Module socialprofile-request-response with MiserMode=true, AllowCategorizedRecentChanges=true" ('socialprofile-request-response', array(true, true))
21:16:57 Module description message apihelp-socialprofile-request-response-description exists
21:16:57 Failed asserting that false is true.
21:16:57
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:51
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/structure/ApiDocumentationTest.php:80
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/tests/phpunit/MediaWikiTestCase.php:399
21:16:57 /srv/jenkins-workspace/workspace/mwext-testextension-php55/src/maintenance/doMaintenance.php:111
21:16:57