I use atoum.phar on a project.
When I run a test with the contextual menu, an error appears because bin/atoum isn't found.
In my test file I have to include/require the atoum.phar like this :
require_once __DIR__ . '/atoum.phar';
it may be that detect this kind of require/include in a test file could allow to the plugin executing the atoum.phar to run the tests of this file.