Tests for mosaic astrometric frame

[stscijgbot-rstdms]

Issue RCAL-669 was created on JIRA by Nadia Dencheva:

The resampling step (ResampleStep) takes a series of input files aligned using Gaia and outputs a single file with the resampled and combined images. The final product is a mosaic frame with an astrometric solution (WCS) for the entire field of view.

The test passes when the keyword 'ICRS' is found in the coordinates section of the L3 metadata, indicating that we tied to ICRS via Gaia.

 
|Success Criteria:|The L3 pipeline produces a mosaic asdf file from resampling L2 files on ICRS.  The test is successful when the meta.coordinates.frame keyword in this file is ICRS.|
|Expected Artifacts:|Mosaic L3 file in ASDF format.|
|Brief Outline of Test Steps:|The pipeline is run on a series of L2 calibrated input files. The mosaic L3 file produced by the pipeline is on ICRS, as indicated by the meta.coordinates.frame keyword.|
|Inputs:|L2-calibrated files to be combined into a mosaic L3 file, on ICRS.  r0001...._cal.asdf, r0001..._cal.asdf, ...|
|Test Methods:|Demo|
|Outputs:|Mosaic L3 file in ASDF format.|

[stscijgbot-rstdms]

Comment by Mairan Teodoro on JIRA:

#787