import { expect, test } from 'vitest';
import { fastHashArrayBuffer, fastHashString } from './fastHash';

test('fastHashString doesnt produce clashes', () => {
  const hashA = fastHashString('abcdef');
  const hashB = fastHashString('abcdeg');
  const hashC = fastHashString('abcdeg');

  expect(hashA).not.toEqual(hashB);
  expect(hashB).toEqual(hashC);
});

test('fastHashArray doesnt product collisions', () => {
  const a = new Int32Array(1000);

  const hash_a = fastHashArrayBuffer(a);
  a[0] = 1;

  const hash_b = fastHashArrayBuffer(a);

  expect(hash_a).not.toEqual(hash_b);
});

// test if the fastHashArray function is deterministic
test('fastHashArray is deterministic', () => {
  const a = new Int32Array(1000);
  a[42] = 69;
  const b = new Int32Array(1000);
  b[42] = 69;
  const hashA = fastHashArrayBuffer(a);
  const hashB = fastHashArrayBuffer(b);
  expect(hashA).toEqual(hashB);
});