Add reference files for end-to-end testing

[arunkannawadi]

No description provided.

[sidneymau]

From @aguinot:

Objects are drawn in order so you will draw only the first 10 objects in the list. Given that stars are at the end, you will not test some particular case regarding the PSF handling. If you want to limit the number of objects drawn you shoudl make sure that they are representative enough of all the cases.
Maybe a way to do that would be link this to a coverage test so we can check if critical part of the code are not covered by the test

[sidneymau]

N.B. hack.sha produced by

find output -type f -exec sha256sum {} \; > hack.sha

and you can validate new outputs with sha256sum -c hack.sha (will require dir format to be the same)

[aguinot]

From @aguinot:

Objects are drawn in order so you will draw only the first 10 objects in the list. Given that stars are at the end, you will not test some particular case regarding the PSF handling. If you want to limit the number of objects drawn you shoudl make sure that they are representative enough of all the cases.
Maybe a way to do that would be link this to a coverage test so we can check if critical part of the code are not covered by the test

Actually, there is another problem by limiting the number of objects particularly to small numbers. Given that there is a buffer defined around the image, you could end up in case where none of the objects are drawn.