message: Set config.assetsPrefix='/' for test environment
diff: @@ -237,6 +237,9 @@ module.exports = function(environment) {
  // Testem prefers this...
  ENV.locationType = 'none';
  + // Test environment needs to find assets in the "regular" location.
  + ENV.assetsPrefix = '/';
  +
  // keep test console output quieter
  ENV.APP.LOG_ACTIVE_GENERATION = false;
  ENV.APP.LOG_VIEW_LOOKUPS = false;
  