[FEATURE] Unit test that optional metadata is autofilled NA during conversion from list to data.frame

When resource metadata is given as a list, there is no guarantee that each resource defines exactly the same set of metadata. Some resources may define additional metadata. When the list of resource is converted to a data.frame internally, additional metadata defined in some resources but not others should be handled as follows:

The additional metadata creates a column in the 1-row data.frame of the corresponding resource
When all the 1-row data.frames are combined, that column should be filled with NA for resources that haven't defined it.

Write a unit test that checks it does indeed work as expected

Context

Provide some context for your bug report or feature request. This could be the:

link to raw code, example: https://github.com/lcolladotor/osca_LIIGH_UNAM_2020/blob/master/00-template.Rmd#L24-L28
link to a commit, example: https://github.com/lcolladotor/osca_LIIGH_UNAM_2020/commit/6aa30b22eda614d932c12997ba611ba582c435d7
link to a line of code inside a commit, example: https://github.com/lcolladotor/osca_LIIGH_UNAM_2020/commit/6aa30b22eda614d932c12997ba611ba582c435d7#diff-e265269fe4f17929940e81341b92b116R17
link to code from an R package, example: https://github.com/LieberInstitute/spatialLIBD/blob/master/R/run_app.R#L51-L55

Code

Include the code you ran and comments

## prompt an error
stop('hola')

## check the error trace
traceback()

Small reproducible example

If you copy the lines of code that lead to your error, you can then run reprex::reprex() which will create a small website with code you can then easily copy-paste here in a way that will be easy to work with later on.

## prompt an error
stop('hola')
#> Error in eval(expr, envir, enclos): hola

## check the error trace
traceback()
#> No traceback available

R session information

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options(width = 120)
sessioninfo::session_info()

The output of sessioninfo::session_info() includes relevant GitHub installation information and other details that are missed by sessionInfo().

iSEE / iSEEindex