Nothing
test_that("lower", {
expect_identical(lower(NA_integer_), NA_real_)
expect_identical(lower(integer(0)), NA_real_)
expect_equal(lower(1), 1)
expect_equal(lower(c(1, 1)), 1)
expect_equal(lower(0:100), 2.5)
expect_equal(lower(c(0:100, NA)), NA_real_)
expect_equal(lower(c(0:100, NA), na_rm = TRUE), 2.5)
})
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