library(testthat)
library(rsample)
library(tidyr)
cvs <- vfold_cv(mtcars)
cvs$one <- 1
cvs$two <- 2
expt <- cvs %>% gather(model, statistic, -id)
test_that('basics', {
res_1 <- gather(cvs)
expect_equal(res_1, expt)
})
test_that('extra args ignored', {
res_2 <- gather(cvs, contains("o"))
expect_equal(res_2, expt)
res_2 <- gather(cvs, key = ignored)
expect_equal(res_2, expt)
res_3 <- gather(cvs, ignored)
expect_equal(res_2, expt)
})
test_that('no extra cols', {
expect_error(gather(vfold_cv(mtcars)))
})
test_that('no splits', {
cvs2 <- cvs
cvs2$splits <- NULL
res_4 <- gather(cvs2)
expect_equal(res_4, expt)
})
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