Tests for data quality information in Level 3 products

[stscijgbot-rstdms]

Issue RCAL-670 was created on JIRA by Nadia Dencheva:

The ResampleStep will create a mosaic L3 file containing three arrays associated with the data quality: {}var_poisson{}, {}var_rnoise{}, and {}var_flat{}. The test will succeed when all of these arrays are present in the output file from {}ResampleStep{}. Additionally, the test will check against NaN in the variance arrays to indicate poor data quality.

 
|Success Criteria:|Presence of three data variance arrays: {}var_poisson{}, {}var_rnoise{}, and {}var_flat{}.|
|Expected Artifacts:|Mosaic L3 file in ASDF format.|
|Brief Outline of Test Steps:|The ResampleStep is run on a series of L2-calibrated input files, resulting in a mosaic L3 file. The test will take the L3 file and check if the data variance arrays are present.|
|Inputs:|A mosaic L3 ASDF file.|
|Test Methods:|Demo|
|Outputs:|Mosaic L3 file is ASDF format.|

[stscijgbot-rstdms]

Comment by Mairan Teodoro on JIRA:

PR: #964