testthat::test_that("is_yyyymm works", {
testthat::expect_true(yyyymm:::is_yyyymm(201912))
})
testthat::test_that("is_yyyymm fails", {
testthat::expect_error(yyyymm:::is_yyyymm(999))
testthat::expect_error(yyyymm:::is_yyyymm(201913))
testthat::expect_error(yyyymm:::is_yyyymm(201912.5))
})
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