Nothing
test_that("function works", {
expect_equal(mean_absorption(c(48e5,28e9), 500, c(4, 94)), matrix(c(3216.7275)))
})
test_that("function does not works", {
expect_error(mean_absorption(c(48e5,28e9), "head", c(4, 94)), "non-numeric argument to binary operator")
})
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