Is it possible that you deleted PEAR after that, or that the PEAR registry files were somehow overwritten?
If you do the following, you will see a list of the phpunit pear channel you are downloading, along with other channels that you have registered or installed from:
$ pear list-channels
For each of them, you should see the channel domain name, its alias, and a summary.
Removing from any of these channels should work the same as you tried, so I think the channel log files may be somehow modified.
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