Nothing
test_that("illustration functions returns ggplot object", {
expect_is(illustrate_RPS(), "ggplot")
expect_is(illustrate_forward_chaining(), "ggplot")
})
test_that("illustration functions identify incorrect inputs", {
expect_error(illustrate_RPS(observed = -1))
expect_error(illustrate_RPS(mu = -10, sigma = 3))
})
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