get_test_data() should return an ungrouped epi_df

[dajmcdon]

1. Ensure that the result of get_test_data() in ungrouped.
2. Add a test to check that this is true.

[ChloeYou]

@dajmcdon do you mean to ungroup by geo_value?

[ChloeYou]

I'll fix this right away! What kind of downstream issues would it cause, just curious?

[dajmcdon]

Yes, exactly. Currently, the object that comes out is a grouped epi_df and it needs to be ungrouped.

(Also, it should really be grouped/sliced by geo_value and any additional_metadata$other_keys. You can use epi_keys() to grab the keys.)

Downstream, the grouping can break the more complicated behaviours needed at prediction time when you start doing the postprocessing. The grouping gums it up (hard for me to explain).

[ChloeYou]

I see. Thanks for explaining! I'll change the grouping as well then.

[ChloeYou]

@dajmcdon I don't think time_value should be included in the grouping right? or else the slice_tail is also grouped by time value.