Nothing

```
context("Duplicated rows")
test_that("Expected results", {
DT <- data.table(x = c(1, 1, 2, 2, 1),
y = c(1, 2, 2, 2, 1),
z = c(1, 2, 3, 4, 5))
expect_equal(nrow(duplicated_rows(DT)), 0)
DT_expected <- data.table(x = c(1, 2, 2, 1),
y = c(1, 2, 2, 1),
z = c(1, 3, 4, 5))
expect_equal(duplicated_rows(DT, by = c("x", "y"), order = FALSE), DT_expected)
})
test_that("na.rm", {
DT <- data.table(x = c(1, 1, 2, 2, 1, NA, NA),
y = c(1, 2, 2, 2, 1, NA, NA),
z = c(1, 2, 3, 4, 5, 6, 7))
DT_narm_TRUE <- data.table(x = c(1, 2, 2, 1),
y = c(1, 2, 2, 1),
z = c(1, 3, 4, 5))
expect_equal(duplicated_rows(DT, by = c("x", "y"), order = FALSE, na.rm = TRUE),
DT_narm_TRUE)
DT_narm_FALSE <- data.table(x = c(1, 2, 2, 1, NA, NA),
y = c(1, 2, 2, 1, NA, NA),
z = c(1, 3, 4, 5, 6, 7))
expect_equal(duplicated_rows(DT, by = c("x", "y"), order = FALSE, na.rm = FALSE),
DT_narm_FALSE)
})
test_that("copy", {
DT <- data.table(x = c(1, 1, 2, 2, 1, NA, NA),
y = c(1, 2, 2, 2, 1, NA, NA),
z = c(1, 2, 3, 4, 5, 6, 7))
expect_equal(nrow(duplicated_rows(DT, by = c("x", "y", "z"), copyDT = FALSE)), 0)
expect_equal(DT[["z"]], c(6, 7, 1, 5, 2, 3, 4))
expect_equal(nrow(duplicated_rows(DT, by = c("x", "y", "z"), copyDT = FALSE, na.last = TRUE)), 0)
expect_equal(DT[["z"]], c(1, 5, 2, 3, 4, 6, 7))
})
```

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