123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172
/* eslint no-shadow: 0 */
const test = require("tap").test;const Random = require("random-js");const random = new Random.Random(Random.MersenneTwister19937.seed(0));const ss = require("../dist/simple-statistics.js");
function rng() {    return random.real(0, 1);}
test("permutation test", function (t) {    t.test(        "P-value of identical distributions being different should be 1",        function (t) {            t.equal(                ss.permutationTest([2, 2, 2, 2, 2], [2, 2, 2, 2, 2]),                1,                undefined,                rng            );            t.end();        }    );    t.test(        "P-value of distribution less than itself should be 1",        function (t) {            t.equal(                ss.permutationTest(                    [2, 2, 2, 2, 2],                    [2, 2, 2, 2, 2],                    "greater",                    undefined,                    rng                ),                1            );            t.end();        }    );    t.test(        "P-value of small sample greater than large sample should be 0",        function (t) {            t.ok(                ss.permutationTest(                    [1, 1, 1, 1, 1, 1, 1, 1, 1, 1],                    [                        99999, 99999, 99999, 99999, 99999, 99999, 99999, 99999,                        99999, 99999                    ],                    "less",                    undefined,                    rng                ) < ss.epsilon            );            t.end();        }    );
    t.test(        "permutationTest should throw error if wrong argument received",        function (t) {            t.throws(function () {                ss.permutationTest([1, 69, 420], [42, 42, 42], "one-tailed");            }, "alternative must be one of specified options");            t.end();        }    );
    t.end();});