Nothing
test_that("has no codes preceded by a 0", {
first_code_digit <- substr(psic_classification$code, 1, 1)
expect_false(0 %in% first_code_digit)
})
test_that("values of `sector` are lowercase not uppercase", {
sectors <- sort(unique(psic_classification$sector))
expect_equal(sectors, tolower(sectors))
})
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