Matrix should have an "upgrade" action, so that we can test to verify that a charm upgrades properly.
This is a tricky one to implement, as we need a sensible way of specifying, in a test, that you want to start with an outdated version of one or more charms in the bundle, and then upgrade to the latest version.
Matrix should have an "upgrade" action, so that we can test to verify that a charm upgrades properly.
This is a tricky one to implement, as we need a sensible way of specifying, in a test, that you want to start with an outdated version of one or more charms in the bundle, and then upgrade to the latest version.