```
context("which.min2 and which.max")
test_that("which.min2/which.max2 works as expected", {
expect_true(is.na(which.min2(c())))
expect_true(is.na(which.max2(c())))
x = 1:10
x.list = as.list(x)
types = c("first", "last", "all", "random")
sapply(types, function(type) {
expect_equal(which.min2(x, type = type), 1L)
expect_equal(which.min2(x.list, type = type), 1L)
expect_equal(which.max2(x, type = type), 10L)
expect_equal(which.max2(x.list, type = type), 10L)
})
x = c(10, 2, 2, 9, 4, 2, 4, 3, 19, 19)
expected.min.idxs = c(2, 3, 6)
expected.max.idxs = c(9, 10)
expect_equal(which.min2(x, type = "first"), 2L)
expect_equal(which.min2(x, type = "all"), expected.min.idxs)
expect_equal(which.min2(x, type = "last"), 6L)
rnd.idx = which.min2(x, type = "random")
expect_true(rnd.idx %in% expected.min.idxs)
expect_equal(which.max2(x, type = "first"), 9L)
expect_equal(which.max2(x, type = "all"), expected.max.idxs)
expect_equal(which.max2(x, type = "last"), 10L)
rnd.idx = which.max2(x, type = "random")
expect_true(rnd.idx %in% expected.max.idxs)
})
```

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