Further clean up of ActivityListenerTest

* \u0020 is a hack required to have spaces at the beginning of resource
  strings. But there's no need to replicate this inside our tests.
* Dependencies shouldn't be static finals.
* Initialization of dependencies is usually boring. I like to extract that
  code to methods and put them at the end of the file.
* Using different values for 'current progress' and 'total' has the
  advantage of breaking tests when the two accidentally get mixed up.