As currently reported in the issue tracker of Codeception, it seems like test results published by PHPUnit 4.* are making xUnit fail the build, complaining it's not in a readable format.

The error I get is the following:

> Attribute 'feature' is not allowed to appear in element 'testcase'.

The current XML that gives me these errors is the following:
https://bpaste.net/show/2fd99120add6