assertObjectMatch error message diff prints arrays as objects

[vwkd]

Describe the bug

The error message diff in assertObjectMatch prints arrays as objects.

This happens if the value has potentially nested property with an array or if the value itself is an array.

Steps to Reproduce

import { assertObjectMatch } from "https://deno.land/std@0.191.0/testing/asserts.ts";

Deno.test("foo", () => {
  const act = { foo: [] };

  const exp = {
    foo: [
      "bar",
    ],
  };

  assertObjectMatch(act, exp);
});

Expected behavior

    [Diff] Actual / Expected


    {
+     foo: [
+       "bar",
+     ],
-     foo: [],
    }

Actual behavior

    [Diff] Actual / Expected


    {
+     foo: {
+       "0": "bar",
+     },
-     foo: {},
    }

Environment

• OS: macOS 12.6.6
• deno version: deno 1.34.1
• std version: 0.191.0

[hasundue]

Happened to me too.

deno 1.36.0 (release, x86_64-unknown-linux-gnu)
v8 11.6.189.12
typescript 5.1.6