CLI: Unit tests for deploy #1270
Description
The deploy command has somehow managed to become both the most complex and least tested function in the whole of new sync
As I've been rushing to get releases out lately I've been over-reliant on manual testing. And the deploy command just isn't working very well - just today I've opened up #1268
It would really help to get a suite of unit tests in place so that I can better isolate issues, as well as tracking regressions of course.
It's not an easy code area to test because of its intrinsic complexity. But some genius/hero needs to figure it out.