context('prop_seen')
test_that('prop_seen', {
dt = data.table(category = c(rep('M', 100), rep('F', 100)),
ID_unique = as.character(c(1:200)),
time_seen = sample(x = c(1:40), size = 200, replace = TRUE) )
ds = prop_seen(dt, 'category', 'ID_unique', 'time_seen')
expect_s3_class( ds, 'data.table' )
})
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