Improved test output readability for custom views failures
Improved test output readability for custom views failures

no issue

- test was failing locally due to a bad dependency version but the "expected null to exist" error was not very helpful
- added custom messages to the expectations so it's immediately obvious which expectation has failed, eg "custom view modal (on add): expected null to exist"

TryGhost/Ghost-Admin,TryGhost/Ghost-Admin