run-test.sh needs full path for --file

After having a crazy idea of utilizing PSR-0 detection (following reading simpletest.module). I went ahead and created a test patch to try and allow themes to natively provide tests. However, there seems to be just one drawback:
It appears run-test.sh requires full paths for the --file argument.

https://qa.drupal.org/pifr/test/673478

[16:33:24] Scanning sites/default/files/checkout/sites/default/modules/bootstrap for .test files.
[16:33:24] Scanning sites/default/files/checkout/sites/default/modules/bootstrap for /Tests/*.php files.
[16:33:24] Cleaning run-tests.sh environment.
[16:33:24] Command [/usr/bin/php ./scripts/run-tests.sh --concurrency 8 --php /usr/bin/php --url 'http://drupaltestbot983-mysql/checkout' --file sites/default/modules/bootstrap/lib/Drupal/bootstrap/Tests/BootstrapUnitTestCase.php --clean 2>&1] succeeded.
[16:33:24] Initiating run-tests.sh.
[16:33:25] Command [/usr/bin/php ./scripts/run-tests.sh --concurrency 8 --php /usr/bin/php --url 'http://drupaltestbot983-mysql/checkout' --file sites/default/modules/bootstrap/lib/Drupal/bootstrap/Tests/BootstrapUnitTestCase.php 2>&1] succeeded
  Duration: 1 seconds
  Directory: [/var/lib/drupaltestbot/sites/default/files/checkout]
  Completion status: [0]
  Output: [ERROR: No valid tests were specified.].
[16:33:25] Encountered error on [review], details:
array (
  '@reason' => 'run-tests.sh reported no tests were found.  See review log for details.',
)
[16:33:25] Review complete. test_id=673478 result code=8 details=Array
(
    [@reason] => run-tests.sh reported no tests were found.  See review log for details.
)

Notice the difference between where the file was detected:
sites/default/files/checkout/sites/default/modules/bootstrap
and what is sent to run-tests.sh as a --file argument:
sites/default/modules/bootstrap/lib/Drupal/bootstrap/Tests/BootstrapUnitTestCase.php

After talking with jthorson on IRC, he suspects that the code responsible for this is located at:
http://drupalcode.org/project/project_issue_file_review.git/blob/refs/he...