Nothing
test_that("Degenerate distribution", {
dist <- dist_degenerate(1)
expect_equal(
dist,
vec_cast(1, new_dist())
)
expect_equal(format(dist), "1")
# quantiles
expect_equal(quantile(dist, 0), 1)
expect_equal(quantile(dist, 0.5), 1)
expect_equal(quantile(dist, 1), 1)
# pdf
expect_equal(density(dist, 1), 1)
expect_equal(density(dist, 0.5), 0)
expect_equal(density(dist, 0.99999), 0)
# cdf
expect_equal(cdf(dist, 0), 0)
expect_equal(cdf(dist, 1), 1)
expect_equal(cdf(dist, 0.9999), 0)
# F(Finv(a)) ~= a
expect_equal(cdf(dist, quantile(dist, 1)), 1, tolerance = 1e-3)
expect_equal(cdf(dist, quantile(dist, 0)), 1, tolerance = 1e-3)
# stats
expect_equal(mean(dist), 1)
expect_equal(variance(dist), 0)
})
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