Continuous integration qunit task fails: ReferenceError: Can't find variable…

[aral]

As per: https://travis-ci.org/axemclion/IndexedDBShim/builds/382754742?utm_source=github_status&utm_medium=notification

Running "qunit:all" (qunit) task
Testing http://localhost:9999/tests-qunit/index.html Unable to shim indexedDB
Starting Tests with shimIndexedDB
>> Grunt qunit: ReferenceError: Can't find variable: DB::[{"file":"http://localhost:9999/tests-qunit/startTests.js","line":27,"function":"deleteDB"},{"file":"http://localhost:9999/tests-qunit/startTests.js","line":49,"function":"startTests"},{"file":"http://localhost:9999/tests-qunit/index.html","line":51,"function":"onload"}]
>> PhantomJS timed out, possibly due to:
>> - QUnit is not loaded correctly.
>> - A missing QUnit start() call.
>> - Or, a misconfiguration of this task.
Warning: 1 tests completed with 1 failed, 0 skipped, and 0 todo. 
0 assertions (in 0ms), passed: 0, failed: 0� Use --force to continue.
Aborted due to warnings.
npm ERR! Linux 4.14.12-041412-generic
npm ERR! argv "/home/travis/.nvm/versions/node/v8.9.2/bin/node" "/home/travis/.nvm/versions/node/v8.9.2/bin/npm" "run" "sauce-qunit"
npm ERR! node v8.9.2
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! indexeddbshim@3.6.2 sauce-qunit: `grunt sauce-qunit`
npm ERR! Exit status 6
npm ERR! 
npm ERR! Failed at the indexeddbshim@3.6.2 sauce-qunit script 'grunt sauce-qunit'.