Nothing

```
context("Testing qlspline")
# Data
d <- data.frame(
x = 0:10,
y = c(6:1, 2:6)
)
test_that("qlspline() works for integer input", {
expect_silent(
m1 <- lm(y ~ qlspline(x, 2, marginal=FALSE), data=d)
)
expect_equivalent( coef(m1), c(6, -1, 1) )
# Knot is at median of `x`
expect_equivalent( attr(m1$model$`qlspline(x, 2, marginal = FALSE)`, "knots"), median(d$x) )
})
test_that("qlspline() computes correct knot location", {
# Knot is at median of `x`
expect_equivalent(
attr(lm(y ~ qlspline(x, 2, marginal=FALSE), data=d)$model$`qlspline(x, 2, marginal = FALSE)`, "knots"),
median(d$x)
)
# Knot is at quartiles
expect_equivalent(
attr(lm(y ~ qlspline(x, 4, marginal=FALSE), data=d)$model$`qlspline(x, 4, marginal = FALSE)`, "knots"),
quantile(d$x, probs=c(0.25, 0.5, 0.75))
)
})
```

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