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import { beforeAll, beforeEach, describe, expect, it } from 'vitest';
import type { Mersenne } from '../src/internal/mersenne/mersenne';
import mersenneFn from '../src/internal/mersenne/mersenne';
import { seededRuns } from './support/seededRuns';
const NON_SEEDED_BASED_RUN = 25;
describe('mersenne twister', () => {
const mersenne: Mersenne = mersenneFn();
for (const seed of [...seededRuns, [42, 1, 2], [1337, 1, 2], [1211, 1, 2]]) {
describe(`seed: ${JSON.stringify(seed)}`, () => {
beforeEach(() => {
mersenne.seed(seed);
});
it(`should return deterministic value for next()`, () => {
const actual = mersenne.next();
expect(actual).toMatchSnapshot();
});
});
}
// Create and log-back the seed for debug purposes
const seeds = [
Math.ceil(Math.random() * 1_000_000_000),
[
Math.ceil(Math.random() * 1_000_000_000),
Math.ceil(Math.random() * 1_000_000_000),
],
];
for (const seed of seeds) {
describe(`random seeded tests ${JSON.stringify(seed)}`, () => {
beforeAll(() => {
mersenne.seed(seed);
});
for (let i = 1; i <= NON_SEEDED_BASED_RUN; i++) {
describe('next', () => {
it('should return random number from interval [0, 1)', () => {
const actual = mersenne.next();
expect(actual).toBeGreaterThanOrEqual(0);
expect(actual).toBeLessThan(1);
});
});
}
});
}
});
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