ContentTranslation merges are blocked due to this error, for example:
https://integration.wikimedia.org/ci/job/quibble-vendor-mysql-hhvm-docker/39333/console
12:12:38 HeadlessChrome 71.0.3578 (Linux 0.0.0) WARN: 'appendToSelector will soon be a required parameter to OverlayManager' 12:12:38 HeadlessChrome 71.0.3578 (Linux 0.0.0) LOG: 'Exception in module-execute in module WikibaseLexeme.tests:' 12:12:38 HeadlessChrome 71.0.3578 (Linux 0.0.0) WARN: TypeError: wb.tests.getMockListItemAdapter is not a function 12:12:38 TypeError: wb.tests.getMockListItemAdapter is not a function 12:12:38 at http://localhost:9876/load.php?debug=false&lang=en&modules=ContentTranslation%20v2%20test%20suite%2Ccolor-picker%2CdataValues%2CdiffMatchPatch%2Cdompurify%2Cjquery%7CWikibaseLexeme.tests%7CdataValues.DataValue%2CTimeValue%2Cvalues%7Cext.centralauth.ForeignApi%7Cext.cite.style%2Cstyles%2CvisualEditor%7Cext.cite.visualEditor.core%2Cdata%2Cicons%2Ctest%7Cext.cx.model%2Csitemapper%2Ctranslation%2Cutil%7Cext.cx.sitemapper.test%7Cext.cx.tools.card%2Ccategories%2Cmanager%2Cmtabuse%2Ctests%2Cvalidator%7Cext.cx.translation.loader%2Cprogress%2Ctests%7Cext.cx.translation.loader.test%7Cext.cx.util.selection%7Cext.echo.api%2Cdm%7Cext.echo.dm.tests%7Cext.eventLogging%7Cext.eventLogging.debug%7Cext.guidedTour.lib%2Cstyles%7Cext.guidedTour.lib.internal%2Ctests%7Cext.templateData.test%7Cext.templateDataGenerator.data%7Cext.uls.common%2Ci18n%2Cinit%2Clanguagenames%2Cmediawiki%2Cmessages%2Cpreferences%2Ctests%7Cext.visualEditor.articleTarget%2Cbase%2CcheckList%2CcommentAnnotation%2Ccore%2Cdata%2CdesktopArticleTarget%2CdesktopTarget%2Cdiffing%2Cexperimental%2Cicons%2Clanguage%2Cmediawiki%2CmoduleIcons%2CmoduleIndicators%2Cmwalienextension%2Cmwcore%2Cmwextensionmessages%2Cmwextensions%2Cmwformatting%2Cmwgallery%2Cmwimage%2Cmwlanguage%2Cmwlink%2Cmwmeta%2Cmwsave%2Cmwtransclusion%2CprogressBarWidget%2Crebase%2Csanitize%2CsupportCheck%2Cswitching%2CtargetLoader%2CtempWikitextEditorWidget%2Ctrack%2Cve%2Cwelcome%7Cext.visualEditor.core.desktop%7Cext.visualEditor.desktopArticleTarget.init%7Cext.visualEditor.mwextensions.desktop%7Cext.visualEditor.mwimage.core%7CglobeCoordinate.js%7Cjquery.AnimationEvent%2CPurposedCallbacks%2CaccessKeyLabel%2CanimateWithEvent%2CcheckboxShiftClick%2Cclient%2Ccolor%2CcolorUtil%2Ccookie%2CfocusAt%2CgetAttrs%2ChighlightText%2Ci18n%2Cinputautoexpand%2ClengthLimit%2CmakeCollapsible%2Csuggestions%2CtabIndex%2Ctablesorter%2CtextSelection%2Cthrottle-debounce%2Ctipsy%7Cjquery.event.special.eachchange%7Cjquery.makeCollapsible.styles%7Cjquery.tablesorter.styles%7Cjquery.ui.EditableTemplatedWidget&skin=vector&version=038ebea:257:614 12:12:38 at http://localhost:9876/load.php?debug=false&lang=en&modules=ContentTranslation%20v2%20test%20suite%2Ccolor-picker%2CdataValues%2CdiffMatchPatch%2Cdompurify%2Cjquery%7CWikibaseLexeme.tests%7CdataValues.DataValue%2CTimeValue%2Cvalues%7Cext.centralauth.ForeignApi%7Cext.cite.style%2Cstyles%2CvisualEditor%7Cext.cite.visualEditor.core%2Cdata%2Cicons%2Ctest%7Cext.cx.model%2Csitemapper%2Ctranslation%2Cutil%7Cext.cx.sitemapper.test%7Cext.cx.tools.card%2Ccategories%2Cmanager%2Cmtabuse%2Ctests%2Cvalidator%7Cext.cx.translation.loader%2Cprogress%2Ctests%7Cext.cx.translation.loader.test%7Cext.cx.util.selection%7Cext.echo.api%2Cdm%7Cext.echo.dm.tests%7Cext.eventLogging%7Cext.eventLogging.debug%7Cext.guidedTour.lib%2Cstyles%7Cext.guidedTour.lib.internal%2Ctests%7Cext.templateData.test%7Cext.templateDataGenerator.data%7Cext.uls.common%2Ci18n%2Cinit%2Clanguagenames%2Cmediawiki%2Cmessages%2Cpreferences%2Ctests%7Cext.visualEditor.articleTarget%2Cbase%2CcheckList%2CcommentAnnotation%2Ccore%2Cdata%2CdesktopArticleTarget%2CdesktopTarget%2Cdiffing%2Cexperimental%2Cicons%2Clanguage%2Cmediawiki%2CmoduleIcons%2CmoduleIndicators%2Cmwalienextension%2Cmwcore%2Cmwextensionmessages%2Cmwextensions%2Cmwformatting%2Cmwgallery%2Cmwimage%2Cmwlanguage%2Cmwlink%2Cmwmeta%2Cmwsave%2Cmwtransclusion%2CprogressBarWidget%2Crebase%2Csanitize%2CsupportCheck%2Cswitching%2CtargetLoader%2CtempWikitextEditorWidget%2Ctrack%2Cve%2Cwelcome%7Cext.visualEditor.core.desktop%7Cext.visualEditor.desktopArticleTarget.init%7Cext.visualEditor.mwextensions.desktop%7Cext.visualEditor.mwimage.core%7CglobeCoordinate.js%7Cjquery.AnimationEvent%2CPurposedCallbacks%2CaccessKeyLabel%2CanimateWithEvent%2CcheckboxShiftClick%2Cclient%2Ccolor%2CcolorUtil%2Ccookie%2CfocusAt%2CgetAttrs%2ChighlightText%2Ci18n%2Cinputautoexpand%2ClengthLimit%2CmakeCollapsible%2Csuggestions%2CtabIndex%2Ctablesorter%2CtextSelection%2Cthrottle-debounce%2Ctipsy%7Cjquery.event.special.eachchange%7Cjquery.makeCollapsible.styles%7Cjquery.tablesorter.styles%7Cjquery.ui.EditableTemplatedWidget&skin=vector&version=038ebea:259:223 12:12:38 at runScript (http://127.0.0.1:9412//index.php?title=Special:JavaScriptTest/qunit/export:13:927) 12:12:38 at execute (http://127.0.0.1:9412//index.php?title=Special:JavaScriptTest/qunit/export:15:553) 12:12:38 at doPropagation (http://127.0.0.1:9412//index.php?title=Special:JavaScriptTest/qunit/export:7:849) 12:12:38 HeadlessChrome 71.0.3578 (Linux 0.0.0) ERROR