- Runner tests
- Implement exception_spy
So here we have a problem. Some plugins are expecting to override some other plugins. The order can't really be arbitrary..... Actually, users won't care about order either. We just want to enable/disable plugins, not really composability.
So it really should be a bucket of plugins. At least for built-in plugins, so that we would be aware of the order. Users shouldn't pay attention on the order of built-in plugins.