Nothing

```
require(xgboost)
context("monotone constraints")
set.seed(1024)
x = rnorm(1000, 10)
y = -1*x + rnorm(1000, 0.001) + 3*sin(x)
train = matrix(x, ncol = 1)
test_that("monotone constraints for regression", {
bst = xgboost(data = train, label = y, max_depth = 2,
eta = 0.1, nthread = 2, nrounds = 100, verbose = 0,
monotone_constraints = -1)
pred = predict(bst, train)
ind = order(train[,1])
pred.ord = pred[ind]
expect_true({
!any(diff(pred.ord) > 0)
}, "Monotone Contraint Satisfied")
})
```

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