Magento EcomDev PHPUnit - Admin Session Error on Install

After installing this package and running the initial phpunit command, I get failures for every method in the EcomDev_PHPUnitTest_Test_Helper_Session class, and one error.

There error is:

1) EcomDev_PHPUnitTest_Test_Helper_Session::testAdminSessionAllRights Exception: Warning: simplexml_load_string(): Entity: line 10: parser error : Start tag expected, '<' not found in /var/www/lib/Varien/Simplexml/Config.php on line 510

If I comment out the 3 tests in this class (testAdminSessionAllRights, testAdminSessionOnlyCatalog, testAdminSessionOnlyCatalogProduct) then everything passes correctly.

Any advice?