Ember test failing on importing in config/environment

When I run ember test on a project I am getting this error ``` --- Log: | { type: 'error', text: 'Error: Could not find module otherapp/config/environment imported from otherapp/tests/helpers/resolver at http://localhost:7357/assets/vendor.js, line 173\n' } ... not ok 2 PhantomJS 2.1 - Global error: Error: Assertion Failed: The tests file was not loaded. Make sure your tests index.html includes "assets/tests.js". at http://localhost:7357/assets/vendor.js, line 15359 --- Log: | { type: 'error', text: 'Error: Assertion Failed: The tests file was not loaded. Make sure your tests index.html includes "assets/tests.js". at http://localhost:7357/assets/vendor.js, line 15359\n' } ...

```

I am not sure how to debug this, since this is happening in the test suite and there is no window to debug, placing debugger; doesnt help. Also this is someone else's project.

This is not a problem in the ember-cli or any packages as I created a new ember app and wrote some acceptance test without any such error. I am not sure how to trace or debug this error.