```
library(HilbertInTreemap)
context('Hilbert curve')
test_that('default hilbert produces correct output', {
curve = hilbert(4)
expect_that(curve$x, equals(c(0, 1, 1, 0, 0, 0, 1, 1, 2, 2, 3, 3, 3, 2, 2, 3)))
expect_that(curve$y, equals(c(0, 0, 1, 1, 2, 3, 3, 2, 2, 3, 3, 2, 1, 1, 0, 0)))
})
test_that('hilbert with positions produces correct output', {
curve = hilbert(4, 5:12)
expect_that(curve$x, equals(c(0, 0, 1, 1, 2, 2, 3, 3)))
expect_that(curve$y, equals(c(2, 3, 3, 2, 2, 3, 3, 2)))
})
test_that('hilbert stops on wrong side length', {
expect_that(hilbert(6), throws_error())
})
test_that('flip and rotate works', {
curve = data.frame(x = c(0, 1, 0, 1, 0, 1, 0, 1),
y = c(2, 3, 2, 3, 2, 3, 2, 3),
rx = c(0, 0, 0, 0, 1, 1, 1, 1),
ry = c(0, 0, 1, 1, 0, 0, 1, 1),
position = 0)
curve = flip.and.rotate(curve, 4)
expect_that(curve$x, equals(c(2, 3, 0, 1, 1, 0, 0, 1)))
expect_that(curve$y, equals(c(0, 1, 2, 3, 3, 2, 2, 3)))
})
```

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