Nothing

```
context("tsearch")
test_that("tsearch gives the expected output", {
x <- c(-1, -1, 1)
y <- c(-1, 1, -1)
p <- cbind(x, y)
tri <- matrix(c(1, 2, 3), 1, 3)
## Should be in triangle #1
ts <- tsearch(x, y, tri, -1, -1)
expect_that(ts, equals(1))
## Should be in triangle #1
ts <- tsearch(x, y, tri, 1, -1)
expect_that(ts, equals(1))
## Should be in triangle #1
ts <- tsearch(x, y, tri, -1, 1)
expect_that(ts, equals(1))
## Centroid
ts <- tsearch(x, y, tri, -1/3, -1/3)
expect_that(ts, equals(1))
## Should be outside triangle #1, so should return NA
ts <- tsearch(x, y, tri, 1, 1)
expect_true(is.na(ts))
})
```

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