Nothing
library(testthat)
test_that("test CRAN mirror works", {
mirrors= test_mirror(region = 'China')
# check the result
expect_s3_class(mirrors, 'data.frame')
expect_named(mirrors, c('Name', 'URL', 'download_time'))
expect_true(nrow(mirrors) > 0)
expect_true(ncol(mirrors) > 0)
})
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