I tested a stack build with Astropy 4.0rc1 and that resulted in jointcal failing unit tests.
To do the install I:
- Made a fresh lsstsw deployment
- Removed astropy
- Updated pytest and pytest-* packages to get v5.3
- Followed instructions on https://github.com/astropy/astropy/wiki/v4.0-RC-testing to install astropy 4.0rc1
- Ran rebuild lsst_distrib
The failures in jointcal all relate to numerical changes in the final chi2 for astrometry and photometry, e.g:
Jointcal passes with the default conda and pytest 5.3.