We're currently using Drush 6 for our tests on Travis-CI, which is working great! However, I just found out that Drupal.org is running Drush 5. It probably makes sense to switch our tests to use Drush 5.10 (the latest Drush 5.x - I don't know which specific version Drupal.org is using) to match, in case there are ever compatiblity issues.

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dsnopek’s picture

@mpotter got some concrete info from @drumm about what Drush is used by the packager:

https://www.drupal.org/node/2311765#comment-9009893

Which appears to be half way between Drush 5.7 and 5.8. Anyway, we can use the same revision on Travis-CI! It also includes a very specific version of the drupalorg_drush and drush_make, which we should probably also use.