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/* eslint no-shadow: 0 */
const test = require("tap").test;const ss = require("../");
test("silhouette test", function (t) {    t.test("Requires equal-sized arrays", function (t) {        t.throws(function () {            ss.silhouette([[0]], [1, 2]);        });        t.end();    });
    t.test("Single cluster of one point has metric 0", function (t) {        const points = [[0.5]];        const labels = [0];        const actual = ss.silhouette(points, labels);        t.same(actual, [0.0]);        const metric = ss.silhouetteMetric(points, labels);        t.equal(metric, 0.0);        t.end();    });
    t.test("Single cluster of two points has metric 1.0", function (t) {        const points = [[0.25], [0.75]];        const labels = [0, 0];        const actual = ss.silhouette(points, labels);        t.same(actual, [1.0, 1.0]);        const metric = ss.silhouetteMetric(points, labels);        t.equal(metric, 1.0);        t.end();    });
    t.test("Two clusters with one point each has metric 0.0", function (t) {        const points = [[0.25], [0.75]];        const labels = [0, 1];        const actual = ss.silhouette(points, labels);        t.same(actual, [0.0, 0.0]);        const metric = ss.silhouetteMetric(points, labels);        t.equal(metric, 0.0);        t.end();    });
    // Outer points have a = 0.1, b = 0.5, s = 4/5.    // Inner points have a = 0.1, b = 0.3, s = 2/3.    t.test("Two clusters with two points each has metric 0.5", function (t) {        const points = [[0.2], [0.4], [0.6], [0.8]];        const labels = [0, 0, 1, 1];        const actual = ss.silhouette(points, labels);        const expected = [4 / 5, 2 / 3, 2 / 3, 4 / 5];        t.ok(actual.every((val, i) => ss.approxEqual(val, expected[i])));        const metric = ss.silhouetteMetric(points, labels);        t.ok(ss.approxEqual(metric, 4 / 5));        t.end();    });
    t.end();});