pytest fails to register pytest-cov

[sunu]

I am trying to run tests with coverage reports using pytest-cov. But pytest-cov plugin doesn't get registered in one of the cases and the tests fails with py.test: error: unrecognized arguments: --cov=splash

Here's an example of a failing job.
Here's the travis config.

[RonnyPfannschmidt]

try running with --collectonly, and take a look at the plugin list
also try a more recent py.test

[sunu]

Using a more recent py.test did fix the issue. Thanks :)