Nothing

```
context("test-frequentdirections.R")
test_that("all_zero_row_index() works", {
eps <- 10^(-3)
x <- matrix(c(1,1,0,10^(-6),2,2), nrow = 3, byrow = TRUE)
testthat::expect_equal(all_zero_row_index(x, 10^(-3)), 2)
testthat::expect_equal(all_zero_row_index(x, 10^(-8)), integer(0))
})
```

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