```
describe("rthcolsums", {
it("behaves like colsums", {
m <- 100
n <- 10
x <- matrix(rnorm(m * n), m, n)
rthval <- rthcolsums(x)
rval <- colSums(x)
expect_equal(rthval[1], rval[1], tolerance = 0.1)
expect_equal(rthval[5], rval[5], tolerance = 0.1)
expect_equal(rthval[10], rval[10], tolerance = 0.1)
})
})
```

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