More complete test coverage once #1376688 and/or #1386424 are fixed

Here is the print_r of the backtrace of this.

Hmmm doing the exact same thing outside of simpletest works fine. Something to do with simpletest's bootstrap? No, still nothing on Google :(

Ha! Adding this:

    if (!function_exists('drupal_map_assoc')) {
      require_once DRUPAL_ROOT . '/includes/common.inc';
    }

at line 989 of path/to/modules/rules/includes/rules.core.inc
and *all* the tests pass!
Boosting to major, and this is therefore linked to #1376604: Test "Mail has been sent if a comment is present and more than a day has passed since the last processing." failing

Why did at least one of the previous calls to cron work, then?

I requested assistance from the Rules team: #1376688: Load common.inc before serializing a variable (during caching), as objects may trigger code in __sleep() while being serialized

Sending a mail just before running cron touches this off. Weird.

This is actually not a bug with this module, but rather has to do with the fact that Drupal does not include common.inc before serializing some variables during caching. More info here:

- #1386424: Do not assume that common.inc has been loaded during __sleep()
- #1376688: Load common.inc before serializing a variable (during caching), as objects may trigger code in __sleep() while being serialized

I have submitted patches for review for both the issues referenced in comment 7, and if either patch gets in, all our tests will pass. However, until such a time, I have removed the part of the test that fails because of these issues and committed the change to MASTER. I will leave this issue open until one or the other or both of those issues are resolved and I can completely test this module.
The enclosed patch should be reapplied once one or the other of the two issues in comment 7 are fixed.

This is the patch which should be applied, rather than the one at comment 8.

No longer a problem since #1376546: states should be conditions, not events -- cron is the event has been fixed.