Nothing

```
data_curve <- data.frame(x1 = c(0,0.5,1), x2 = c(0,0,0))
test_that("Test can calculate polygon length", {
expect_equal(get_polygon_length(data_curve), 1)
})
test_that("Test can calculate curve center", {
expect_equal(get_center(data_curve), c(x1 = 0.5, x2 = 0))
})
test_that("Test distance between same curves is zero",{
srv_data_curve <- elasdics::get_srv_from_points(data_curve)
knots <- c(0,0.5,1)
type <- "polygon"
coefs <- as.matrix(srv_data_curve[,-1])
distance <- get_distance(
srv_curve = function(t) t(make_design(t, knots=knots, type=type) %*% coefs),
s = c(srv_data_curve$t, 1),
q = t(srv_data_curve[,-1])
)
expect_equal(distance, 0, tolerance=1e-6)
})
```

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