source("../example.R", chdir=TRUE)
library(testthat)

test_that("Real numbers are transformed to odd numbers.", {
  expect_equal(linear_transformation(3) %% 2, 1)
  expect_equal(linear_transformation(4) %% 2, 1)
})

test_that("Positive numbers remain positive.", {
  expect_true(linear_transformation(3) > 0)
  expect_true(linear_transformation(10) > 0)
})