paratest: Could not read "phpunit.xml"

Paratest refuses to see my phpunit.xml file and then refuses to read it when I use -c param. Tried 0.7.1 and dev-master.

tests/phpunit.xml file:

<phpunit bootstrap="./bootstrap.php" colors="true">
    <testsuites>
        <testsuite name="Unit Tests">
            <directory>./AppTest</directory>
        </testsuite>
    </testsuites>
</phpunit>

Reproduce:

$ composer require brianium/paratest:dev-master
$ cd tests
$ ../vendor/bin/paratest



  [RuntimeException]
  No path or configuration provided (tests must end with Test.php)



paratest [-p|--processes="..."] [-f|--functional] [--no-test-tokens] [-h|--help] [--coverage-clover="..."] [--coverage-html="..."] [--coverage-php="..."] [--phpunit="..."] [--runner="..."] [--bootstrap="..."] [-c|--configuration="..."] [-g|--group="..."] [--exclude-group="..."] [--stop-on-failure] [--log-junit="..."] [--colors] [--path="..."] [path]

$ ../vendor/bin/paratest -c phpunit.xml
Could not read "phpunit.xml".