55 lines
1.2 KiB
TypeScript
55 lines
1.2 KiB
TypeScript
import { test, expect } 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('fastHashArray is fast(ish) < 20ms', () => {
|
|
|
|
const a = new Int32Array(10_000);
|
|
|
|
const t0 = performance.now();
|
|
fastHashArrayBuffer(a);
|
|
|
|
const t1 = performance.now();
|
|
|
|
a[0] = 1;
|
|
|
|
fastHashArrayBuffer(a);
|
|
|
|
const t2 = performance.now();
|
|
|
|
expect(t1 - t0).toBeLessThan(20);
|
|
expect(t2 - t1).toBeLessThan(20);
|
|
});
|
|
|
|
// 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);
|
|
});
|