This file should be loaded before the other spec files, right?  If so, the compiled .js file should be included as the first item under "spec_paths" in  "js_test.yml":

    spec_paths:
    - coffee/spec/discussion/unicode_specs.js
    - coffee/spec
    - js/spec
    - js/capa/spec

This doesn't fix the current build failures, but it could prevent future ones.