Nothing
test_that("unique", {
expect_identical(unique(new_hms(numeric(0))), new_hms(numeric(0)))
expect_identical(unique(new_hms(NA_real_)), new_hms(NA_real_))
expect_identical(unique(new_hms(101)), new_hms(101))
expect_identical(unique(new_hms(c(101, 101, 99, 101))), new_hms(c(101, 99)))
expect_identical(unique(new_hms(c(101, NA_real_, 101, 99, 101))), new_hms(c(101, NA_real_, 99)))
})
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