The last successfull run can be found at https://integration.wikimedia.org/ci/job/mwext-qunit-jessie/6407/console from the 30th November.
The first failure run can be found at https://integration.wikimedia.org/ci/job/mwext-qunit-jessie/6711 from the 10 Dec
The failure is confirmed by the job validation patch at https://gerrit.wikimedia.org/r/#/c/326533/ https://integration.wikimedia.org/ci/job/mwext-qunit-jessie/6775/console
Output can be seen below:
```
20:16:40 Chrome 53.0.2785 (Linux 0.0.0) ext.RevisionSlider.RevisionListView tooltip is composed correctly with en lang FAILED
20:16:40 Test the page size.
20:16:40 Expected: true
20:16:40 Actual: null
20:16:40 at Object.<anonymous> (http://localhost:9876/jenkins-mwext-qunit-jessie-6775/load.php?debug=false&lang=en&modules=ext.RevisionSlider.DiffPage%2CHelpDialog%2CPointer%2CPointerLine%2CPointerView%2CRevision%2CRevisionList%2CRevisionListView%2CSlider%2CSliderView%2CdialogImages%2Ctests%7Cjquery.accessKeyLabel%2CautoEllipsis%2CbyteLength%2CbyteLimit%2CcheckboxShiftClick%2Cclient%2Ccolor%2CcolorUtil%2Ccookie%2CgetAttrs%2Chidpi%2ChighlightText%2Clocalize%2CmakeCollapsible%2Cmw-jump%2CmwExtension%2Cplaceholder%2CtabIndex%2Ctablesorter%2CtextSelection%7Cmediawiki.ForeignApi%2CRegExp%2CTitle%2CUri%2Capi%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2CmessagePoster%2Cnotify%2Cstorage%2Ctemplate%2Ctoc%2Cuser%2Cutil%2Cviewport%7Cmediawiki.ForeignApi.core%7Cmediawiki.api.category%2Cedit%2Cmessages%2Coptions%2Cparse%2Cupload%2Cuser%2Cwatch%7Cmediawiki.language.data%2Cinit%2Cmonths%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.special.recentchanges%7Cmediawiki.template.mustache%2Cregexp%7Cmoment%2Coojs%2Coojs-ui%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cindicators%2Ctextures%7Ctest.mediawiki.qunit.suites%2Ctestrunner%7Ctest.sinonjs%7Cuser.defaults&skin=fallback&version=1be0466:61:373)
20:16:40 at runTest (node_modules/qunitjs/qunit/qunit.js:905:28)
20:16:40 at Object.run (node_modules/qunitjs/qunit/qunit.js:890:4)
20:16:40 at node_modules/qunitjs/qunit/qunit.js:1032:11
20:16:40 at process (node_modules/qunitjs/qunit/qunit.js:692:24)
20:16:40 at begin (node_modules/qunitjs/qunit/qunit.js:674:2)
20:16:40
20:16:40 Test the change size.
20:16:40 Expected: true
20:16:40 Actual: null
20:16:40 at Object.<anonymous> (http://localhost:9876/jenkins-mwext-qunit-jessie-6775/load.php?debug=false&lang=en&modules=ext.RevisionSlider.DiffPage%2CHelpDialog%2CPointer%2CPointerLine%2CPointerView%2CRevision%2CRevisionList%2CRevisionListView%2CSlider%2CSliderView%2CdialogImages%2Ctests%7Cjquery.accessKeyLabel%2CautoEllipsis%2CbyteLength%2CbyteLimit%2CcheckboxShiftClick%2Cclient%2Ccolor%2CcolorUtil%2Ccookie%2CgetAttrs%2Chidpi%2ChighlightText%2Clocalize%2CmakeCollapsible%2Cmw-jump%2CmwExtension%2Cplaceholder%2CtabIndex%2Ctablesorter%2CtextSelection%7Cmediawiki.ForeignApi%2CRegExp%2CTitle%2CUri%2Capi%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2CmessagePoster%2Cnotify%2Cstorage%2Ctemplate%2Ctoc%2Cuser%2Cutil%2Cviewport%7Cmediawiki.ForeignApi.core%7Cmediawiki.api.category%2Cedit%2Cmessages%2Coptions%2Cparse%2Cupload%2Cuser%2Cwatch%7Cmediawiki.language.data%2Cinit%2Cmonths%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.special.recentchanges%7Cmediawiki.template.mustache%2Cregexp%7Cmoment%2Coojs%2Coojs-ui%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cindicators%2Ctextures%7Ctest.mediawiki.qunit.suites%2Ctestrunner%7Ctest.sinonjs%7Cuser.defaults&skin=fallback&version=1be0466:61:433)
20:16:40 at runTest (node_modules/qunitjs/qunit/qunit.js:905:28)
20:16:40 at Object.run (node_modules/qunitjs/qunit/qunit.js:890:4)
20:16:40 at node_modules/qunitjs/qunit/qunit.js:1032:11
20:16:40 at process (node_modules/qunitjs/qunit/qunit.js:692:24)
20:16:40 at begin (node_modules/qunitjs/qunit/qunit.js:674:2)
20:16:40
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 365 of 378 (1 FAILED) (0 secs / 6.08 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 366 of 378 (1 FAILED) (0 secs / 6.081 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 367 of 378 (1 FAILED) (0 secs / 6.083 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 368 of 378 (1 FAILED) (0 secs / 6.085 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 369 of 378 (1 FAILED) (0 secs / 6.086 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 370 of 378 (1 FAILED) (0 secs / 6.087 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 371 of 378 (1 FAILED) (0 secs / 6.089 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 372 of 378 (1 FAILED) (0 secs / 6.091 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 373 of 378 (1 FAILED) (0 secs / 6.094 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0) ext.RevisionSlider.RevisionListView big change number is formatted correctly FAILED
20:16:40 Expected: "+1,000"
20:16:40 Actual: "+1.000"
20:16:40 at Object.<anonymous> (http://localhost:9876/jenkins-mwext-qunit-jessie-6775/load.php?debug=false&lang=en&modules=ext.RevisionSlider.DiffPage%2CHelpDialog%2CPointer%2CPointerLine%2CPointerView%2CRevision%2CRevisionList%2CRevisionListView%2CSlider%2CSliderView%2CdialogImages%2Ctests%7Cjquery.accessKeyLabel%2CautoEllipsis%2CbyteLength%2CbyteLimit%2CcheckboxShiftClick%2Cclient%2Ccolor%2CcolorUtil%2Ccookie%2CgetAttrs%2Chidpi%2ChighlightText%2Clocalize%2CmakeCollapsible%2Cmw-jump%2CmwExtension%2Cplaceholder%2CtabIndex%2Ctablesorter%2CtextSelection%7Cmediawiki.ForeignApi%2CRegExp%2CTitle%2CUri%2Capi%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2CmessagePoster%2Cnotify%2Cstorage%2Ctemplate%2Ctoc%2Cuser%2Cutil%2Cviewport%7Cmediawiki.ForeignApi.core%7Cmediawiki.api.category%2Cedit%2Cmessages%2Coptions%2Cparse%2Cupload%2Cuser%2Cwatch%7Cmediawiki.language.data%2Cinit%2Cmonths%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.special.recentchanges%7Cmediawiki.template.mustache%2Cregexp%7Cmoment%2Coojs%2Coojs-ui%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cindicators%2Ctextures%7Ctest.mediawiki.qunit.suites%2Ctestrunner%7Ctest.sinonjs%7Cuser.defaults&skin=fallback&version=1be0466:64:480)
20:16:40 at runTest (node_modules/qunitjs/qunit/qunit.js:905:28)
20:16:40 at Object.run (node_modules/qunitjs/qunit/qunit.js:890:4)
20:16:40 at node_modules/qunitjs/qunit/qunit.js:1032:11
20:16:40 at process (node_modules/qunitjs/qunit/qunit.js:692:24)
20:16:40 at begin (node_modules/qunitjs/qunit/qunit.js:674:2)
20:16:40
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 374 of 378 (2 FAILED) (0 secs / 6.097 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0) ext.RevisionSlider.RevisionListView page size is formatted correctly FAILED
20:16:40 failed, expected argument to be truthy, was: null
20:16:40 Expected: true
20:16:40 Actual: null
20:16:40 at Object.<anonymous> (http://localhost:9876/jenkins-mwext-qunit-jessie-6775/load.php?debug=false&lang=en&modules=ext.RevisionSlider.DiffPage%2CHelpDialog%2CPointer%2CPointerLine%2CPointerView%2CRevision%2CRevisionList%2CRevisionListView%2CSlider%2CSliderView%2CdialogImages%2Ctests%7Cjquery.accessKeyLabel%2CautoEllipsis%2CbyteLength%2CbyteLimit%2CcheckboxShiftClick%2Cclient%2Ccolor%2CcolorUtil%2Ccookie%2CgetAttrs%2Chidpi%2ChighlightText%2Clocalize%2CmakeCollapsible%2Cmw-jump%2CmwExtension%2Cplaceholder%2CtabIndex%2Ctablesorter%2CtextSelection%7Cmediawiki.ForeignApi%2CRegExp%2CTitle%2CUri%2Capi%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2CmessagePoster%2Cnotify%2Cstorage%2Ctemplate%2Ctoc%2Cuser%2Cutil%2Cviewport%7Cmediawiki.ForeignApi.core%7Cmediawiki.api.category%2Cedit%2Cmessages%2Coptions%2Cparse%2Cupload%2Cuser%2Cwatch%7Cmediawiki.language.data%2Cinit%2Cmonths%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%2Cstartup%7Cmediawiki.special.recentchanges%7Cmediawiki.template.mustache%2Cregexp%7Cmoment%2Coojs%2Coojs-ui%2Coojs-ui-core%2Coojs-ui-toolbars%2Coojs-ui-widgets%2Coojs-ui-windows%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cindicators%2Ctextures%7Ctest.mediawiki.qunit.suites%2Ctestrunner%7Ctest.sinonjs%7Cuser.defaults&skin=fallback&version=1be0466:64:903)
20:16:40 at runTest (node_modules/qunitjs/qunit/qunit.js:905:28)
20:16:40 at Object.run (node_modules/qunitjs/qunit/qunit.js:890:4)
20:16:40 at node_modules/qunitjs/qunit/qunit.js:1032:11
20:16:40 at process (node_modules/qunitjs/qunit/qunit.js:692:24)
20:16:40 at begin (node_modules/qunitjs/qunit/qunit.js:674:2)
20:16:40
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 375 of 378 (3 FAILED) (0 secs / 6.099 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 376 of 378 (3 FAILED) (0 secs / 6.099 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 377 of 378 (3 FAILED) (0 secs / 6.124 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 378 of 378 (3 FAILED) (0 secs / 6.143 secs)
20:16:40 Chrome 53.0.2785 (Linux 0.0.0): Executed 378 of 378 (3 FAILED) (6.386 secs / 6.143 secs)
20:16:40 12 12 2016 20:16:39.337:DEBUG [karma]: Run complete, exiting.
20:16:40 12 12 2016 20:16:39.339:DEBUG [launcher]: Disconnecting all browsers
20:16:40 12 12 2016 20:16:39.863:DEBUG [launcher]: Process Chrome exited with code 0
20:16:40 12 12 2016 20:16:39.864:DEBUG [temp-dir]: Cleaning temp dir /home/jenkins/tmpfs/jenkins-0/karma-26044742
20:16:40 12 12 2016 20:16:39.921:DEBUG [launcher]: Finished all browsers
20:16:40 Warning: Task "karma:main" failed. Use --force to continue.
20:16:40
20:16:40 Aborted due to warnings.
```
2 members of the WMDE team, @Tobi_WMDE_SW & I have struggled to reproduce this locally at all :/