Nothing
test_that("Check whether interpolant does what it's supposed to", {
#We only work with increasing data in y, so no need to check when y is not increasing
x <- c(1, 2, 3, 4)
y <- c(3, 5, 9, 20)
expect_equal(RootLinearInterpolant(x, y, y0 = 4), 1.5)
expect_equal(RootLinearInterpolant(x, y, y0 = 7), 2.5)
#check for unsorted
rord <- sample(1:4)
x <- x[rord]
y <- y[rord]
expect_equal(RootLinearInterpolant(x, y, y0 = 4), 1.5)
expect_equal(RootLinearInterpolant(x, y, y0 = 7), 2.5)
#Return NA when no inverse exists
expect_equal(RootLinearInterpolant(x, y, y0 = 30), NA)
})
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