title: karma does not run my typescript tests along javascript tests
body: <p>we have a rather big/long-grown angular project. It currently runs angular 1.2 (we are in the process to upgrade to angular 1.5 and start preparing the angular2 migration).</p>
  
  <p>To be able to start the angular2 migration, we want to integrate typescript into the project. The integration for the source files was quite easy. We use browserify; we just added tsify and some configs and everything worked within minutes (js+ts code/modules get bundled together).</p>
  
  <p>For our frontend unit tests (karma, jasmine) its quite the opposite (working on that for hours now).</p>
  
  <p>Here is our karma config:
  <a href="https://gist.github.com/ds82/2eaeae875eef92481bc699ead8a7ac5c" rel="nofollow">https://gist.github.com/ds82/2eaeae875eef92481bc699ead8a7ac5c</a></p>
  
  <p>If I run our test suite with this config, the typescript spec files are just ignored completely. The tests nor the code inside these typescript files is executed at all (have console.log at the top of the spec.ts files).
  Browserify logs that it includes the typescript files, but if I open the karma debug browser view and try to open the source of the spec.ts files Chromes shows me just an empty file. While I'm doing this it logs:</p>
  
  <p><code>28 06 2016 16:25:35.242:WARN [web-server]: 404: /absolute/var/folders/0p/b7pdm54d26q8db2qsxtxb3z80000gn/T/app/scripts/blobb.spec.ts
  </code></p>
  
  <p>Now, if I comment out line 49 and line 50 of the karma config (which results in <em>only</em> loading the spec.<strong>ts</strong> files an <em>no</em> spec.<strong>js</strong> files), the typescript tests run just as expected. At the same time, I can view the spec.ts files in the karma debug browser view.</p>
  
  <p>To summarise: If I run all tests (javascript + typescript), just the javascript files/tests are executed. If I disable/comment-out all javascript tests, my typescript tests run fine.</p>
  
  <p>Does anybody has an idea how I could find the cause of this?</p>