Warnings when performing Unit Tests w/ Search enabled

We were experiencing the same issue, so I spent some time today tracking this down.

It's not really a problem with the VotingAPI module. The probably is actually a symptom of the way the SimpleTest module works. In this particular case, the exceptions are thrown because the test calls node_delete. From the node module:

/**
 * Delete a node.
 */
function node_delete($nid) {

    /* ... */

    // Remove this node from the search index if needed.
    if (function_exists('search_wipe')) {
      search_wipe($node->nid, 'node');
    }

    /* ... */
}

The VotingAPI simple test does not enable the search module before it runs therefore the search index database tables are never created. But, if you happen to have the search module enabled on your Drupal site, the function search_wipe WILL exist in the scope of the simple test, despite the fact that the search module is not installed.

There is no awesome way to fix this. There are three options as far as I can tell:

1.) Install the search module in the VotingAPI simpletest
2.) Replace instances in core of function_exists('search_wipe') with module_exists('search')
3.) Somehow run SimpleTest in its own scope.

2 is pretty much out of the question. No reason to make core slower to fix something in SimpleTest. 3 is like, hard. Maybe if SimpleTest was invoked from the command line it could be possible. I'm not sure.

So, I'm attaching a patch that takes approach #1.

Drupal 6 is no longer supported. Closing old issues to clean up the issue queue.

Please reopen and update this issue if this is still an issue in the D7 or D8 version.