Any ideas on how to release this working copy properly so it can be deleted between tests?

Have you tried calling the cleanup() method first?

$client->cleanup($dir, $pool); Recursively cleanup a working copy directory, $dir, finishing any incomplete operations, removing lockfiles, etc.
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In reply to Re: SVN::Client -- deleting created working copy results in 'cannot remove directory' by BrowserUk
in thread SVN::Client -- deleting created working copy results in 'cannot remove directory' by tj_thompson

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