@hyperlane-xyz/utils/dist/math.test.js

General utilities and types for the Hyperlane network

import { expect } from 'chai';
import { mean, median, randomInt, stdDev, sum } from './math.js';
describe('Math Utility Functions', () => {
    describe('median', () => {
        it('should return the median of an odd-length array', () => {
            expect(median([1, 3, 2])).to.equal(2);
        });
        it('should return the median of an even-length array', () => {
            expect(median([1, 2, 3, 4])).to.equal(2.5);
        });
        it('should return the median of an even-length array with non sorted numbers', () => {
            expect(median([1, 2, 0, 4, 5, 6])).to.equal(3);
        });
    });
    describe('sum', () => {
        it('should return the sum of an array', () => {
            expect(sum([1, 2, 3, 4])).to.equal(10);
            expect(sum([1, -2, 3, 4])).to.equal(6);
        });
    });
    describe('mean', () => {
        it('should return the mean of an array', () => {
            expect(mean([1, 2, 3, 4])).to.equal(2.5);
        });
    });
    describe('stdDev', () => {
        it('should return the standard deviation of an array', () => {
            expect(stdDev([1, 2, 3, 4])).to.be.closeTo(1.118, 0.001);
        });
        it('should return the standard deviation of an array with negative numbers', () => {
            expect(stdDev([-1, -2, -3, -4])).to.be.closeTo(1.118, 0.001);
        });
    });
    describe('randomInt', () => {
        it('should return a random integer within the specified range', () => {
            const min = 1;
            const max = 10;
            const result = randomInt(max, min);
            expect(result).to.be.at.least(min);
            expect(result).to.be.below(max);
            expect(result % 1).to.equal(0); // its an integer
        });
    });
});
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