mirror of
https://github.com/denoland/std.git
synced 2024-11-22 04:59:05 +00:00
69 lines
2.5 KiB
TypeScript
69 lines
2.5 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
|
|
import { equals } from "./equals.ts";
|
|
import { assert, assertEquals, assertNotEquals } from "@std/assert";
|
|
|
|
Deno.test("equals()", () => {
|
|
const v = equals(new Uint8Array([0, 1, 2, 3]), new Uint8Array([0, 1, 2, 3]));
|
|
const v2 = equals(new Uint8Array([0, 1, 2, 2]), new Uint8Array([0, 1, 2, 3]));
|
|
const v3 = equals(new Uint8Array([0, 1, 2, 3]), new Uint8Array([0, 1, 2]));
|
|
assert(v);
|
|
assert(!v2);
|
|
assert(!v3);
|
|
});
|
|
|
|
const THRESHOLD_32_BIT = 160;
|
|
|
|
Deno.test("equals() handles randomized testing", () => {
|
|
// run tests before and after cutoff
|
|
for (let len = THRESHOLD_32_BIT - 10; len <= THRESHOLD_32_BIT + 10; len++) {
|
|
const arr1 = crypto.getRandomValues(new Uint8Array(len));
|
|
const arr2 = crypto.getRandomValues(new Uint8Array(len));
|
|
const arr3 = arr1.slice(0);
|
|
// the chance of arr1 equaling arr2 is basically 0
|
|
// but introduce an inequality at the end just in case
|
|
arr2[arr2.length - 1] = arr1.at(-1)! ^ 1;
|
|
// arr3 is arr1 but with an inequality in the very last element
|
|
// this is to test the equality check when length isn't a multiple of 4
|
|
arr3[arr3.length - 1] ^= 1;
|
|
// arrays with same underlying ArrayBuffer should be equal
|
|
assert(equals(arr1, arr1));
|
|
// equal arrays with different underlying ArrayBuffers should be equal
|
|
assert(equals(arr1, arr1.slice(0)));
|
|
// inequal arrays should be inequal
|
|
assert(!equals(arr1, arr2));
|
|
assert(!equals(arr1, arr3));
|
|
}
|
|
});
|
|
|
|
// https://github.com/denoland/deno_std/issues/3603
|
|
Deno.test("equals() works with .subarray()", () => {
|
|
const a = new Uint8Array(1001).subarray(1);
|
|
const b = new Uint8Array(1000);
|
|
a[0] = 123;
|
|
b[0] = 123;
|
|
assertEquals(a, b);
|
|
assert(equals(a, b));
|
|
|
|
const c = new Uint8Array(1001).subarray(1);
|
|
const d = new Uint8Array(1000);
|
|
c[999] = 123;
|
|
assertNotEquals(c, d); // ok
|
|
assert(!equals(c, d));
|
|
|
|
// Test every length/offset combination (modulo 4) to ensure that every byte is checked.
|
|
for (let offsetA = 0; offsetA < 4; offsetA++) {
|
|
for (let offsetB = 0; offsetB < 4; offsetB++) {
|
|
for (let len = THRESHOLD_32_BIT; len < THRESHOLD_32_BIT + 4; len++) {
|
|
const x = new Uint8Array(new ArrayBuffer(len + offsetA), offsetA);
|
|
const y = new Uint8Array(new ArrayBuffer(len + offsetB), offsetB);
|
|
for (let i = 0; i < len; i++) {
|
|
assert(equals(x, y));
|
|
x[i] = 1;
|
|
assert(!equals(x, y));
|
|
y[i] = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
});
|