Tests for total exposure time in Level 3 products

[stscijgbot-rstdms]

Issue RCAL-672 was created on JIRA by Nadia Dencheva:

The ResampleStep will create a mosaic L3 file containing an attribute named {}resample{}, which will hold all the parameters and values used in or calculated by the resampling step. One of the calculated parameters is the total exposure time of the mosaic (named {}product_exposure_time{}), which is added up by exposure.

The test will succeed if the combined total exposure time, {}product_exposure_time{}, can be found in the resample attribute.
|Success Criteria:|Presence of the combined total exposure time keyword ({}product_exposure_time{}) in the resample attribute.|
|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 product_exposure_time keyword is present.|
|Inputs:|A mosaic L3 ASDF file.|
|Test Methods:|Demo|
|Outputs:|None|

[stscijgbot-rstdms]

Comment by Mairan Teodoro on JIRA:

#787