missing_month() in utils.R

[sarabodach]

          > @sarabodach Can you elaborate on "Include tests for NA" here? Do you want a unit test to see how the code handles empty dates? Since we are specifically looking for suspicious instances where year and day are present I assume this check doent care much if the date is fully missing

Maybe this would be a unit test for the function that is used across? This is based on an assumption that the string is "--" - i.e.,

sdtmchecks/R/utils.R

Line 209 in 2505395

missing_month <- function(date) { substr(date, 5, 7) == "---" }

I wonder if we can consider expanding the assumption that the string might be reported as "UNK" or "UN" or something else? But that would be a separate issue. For the original checkbox issue - the NA part doesn't apply as I had originally thought.

Originally posted by @sarabodach in #333 (comment)