Nothing
context("check circulate")
test_that("circulate works propertly", {
x = 1:10
expect_equivalent(circulate(x), c(2:10, 1))
expect_equivalent(circulate(x, n = 2), c(3:10, 1:2))
expect_equivalent(circulate(x, n = 3), c(4:10, 1:3))
})
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