How to run ember-cli test in jenkins

How can i run Ember-cli test in jenkins?

Currently to run the tests i added a build step "Execute shell" with the following in it:

ember test --silent --config-file ${WORKSPACE}/testem.json > ${WORKSPACE}/xunit-ember-dev.xml;

But it doesn't work, this is the output

<testsuite name="Testem Tests" tests="0" failures="0" timestamp="Thu Feb 12 2015 14:20:24 GMT+0100 (CET)" time="0">

</testsuite>

If I do the same manually in the workspace as jenkins user I got the expected results.

<testsuite name="Testem Tests" tests="70" failures="0" timestamp="Thu Feb 12 2015 15:06:40 GMT+0100 (CET)" time="15">
    <testcase name="PhantomJS 1.9 Integration - Homepage: Should display the homepage"/>
    <testcase name="PhantomJS 1.9 Integration - Profile: Should display the profile sections"/>
    ...

Every time I make Jenkins run the tests, he find no tests.

Thanks