Test the broad shape of an issue (the right objects/properties appear, and are the right value)
This does not use any JSON bean deserialization, so we avoid any bugs that mask themselves
(e.g.
This *should* live in com.atlassian.jira.webtests.ztests.misc.TestSeraphAuthType but those tests don't run
with bundled plugins enabled and this depends on the atlassian-rest plugin existing.