[Node v20] assert.deepEqual doesn't detect two different URLs

[regseb]

Version

v20.9.0

Platform

Linux regseblaptop 6.2.0-36-generic #37~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct 9 15:34:04 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

No response

What steps will reproduce the bug?

• create file index.js:

  const assert = require("node:assert/strict");
  
  const url1 = new URL("http://foo1.com/");
  const url2 = new URL("http://foo2.com/");
  assert.deepEqual(url1, url2);

• node index.js

How often does it reproduce? Is there a required condition?

Always.

What is the expected behavior? Why is that the expected behavior?

The index.js script must raise an error because the two URLs are different.

What do you see instead?

No error.

Additional information

• npx node@18 index.js

  node:assert:125
    throw new AssertionError(obj);
    ^
  
  AssertionError [ERR_ASSERTION]: Expected values to be strictly deep-equal:
  + actual - expected ... Lines skipped
  
    URL {
      [Symbol(context)]: URLContext {
        hash_start: 4294967295,
        host_end: 15,
        host_start: 7,
  +     href: 'http://foo1.com/',
  -     href: 'http://foo2.com/',
        pathname_start: 15,
  ...
        username_end: 7
      }
    }
      at Object.<anonymous> (/home/regseb/testcase/index.js:5:8)
      at Module._compile (node:internal/modules/cjs/loader:1256:14)
      at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
      at Module.load (node:internal/modules/cjs/loader:1119:32)
      at Module._load (node:internal/modules/cjs/loader:960:12)
      at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:86:12)
      at node:internal/main/run_main_module:23:47 {
    generatedMessage: true,
    code: 'ERR_ASSERTION',
    actual: URL {
      [Symbol(context)]: URLContext {
        href: 'http://foo1.com/',
        protocol_end: 5,
        username_end: 7,
        host_start: 7,
        host_end: 15,
        pathname_start: 15,
        search_start: 4294967295,
        hash_start: 4294967295,
        port: 4294967295,
        scheme_type: 0
      }
    },
    expected: URL {
      [Symbol(context)]: URLContext {
        href: 'http://foo2.com/',
        protocol_end: 5,
        username_end: 7,
        host_start: 7,
        host_end: 15,
        pathname_start: 15,
        search_start: 4294967295,
        hash_start: 4294967295,
        port: 4294967295,
        scheme_type: 0
      }
    },
    operator: 'deepStrictEqual'
  }
  
  Node.js v18.18.2
  

[regseb]

The two URLs are different.

• With Node v18, assert.deepEqual shows that there is a difference.
• With Node v20, assert.deepEqual doesn't return an error, although the URLs aren't equal.

It works in v18 and the bug is in v20.

[marco-ippolito]

cc @anonrig

[BridgeAR]

The difference is not about assert. It's about URL changing the properties of the object. In Node.js 18 the symbol was enumerable and therefore it was compared by assert. But the URL object changed in the meanwhile.

[climba03003]

I believe it is closely related to #46904 which changing the symbol to private property.
assert.deepEqual only compare the enumerable properties, so it no longer able to check that symbol property.

Will it be acceptable to check like Date in here, and create an dedicated checking for URL object?

node/lib/internal/util/comparisons.js

Lines 184 to 204 in f425710

	} else if (isDate(val1)) {
	if (!isDate(val2) ||
	DatePrototypeGetTime(val1) !== DatePrototypeGetTime(val2)) {
	return false;
	}
	} else if (isRegExp(val1)) {
	if (!isRegExp(val2) || !areSimilarRegExps(val1, val2)) {
	return false;
	}
	} else if (isArrayBufferView(val1)) {
	if (TypedArrayPrototypeGetSymbolToStringTag(val1) !==
	TypedArrayPrototypeGetSymbolToStringTag(val2)) {
	return false;
	}
	if (!strict && (isFloat32Array(val1) || isFloat64Array(val1))) {
	if (!areSimilarFloatArrays(val1, val2)) {
	return false;
	}
	} else if (!areSimilarTypedArrays(val1, val2)) {
	return false;
	}

[regseb]

The util.isDeepStrictEqual(val1, val2) method has the same problem (probably because it uses the same code).

const util = require("node:util");

const url1 = new URL("http://foo1.com/");
const url2 = new URL("http://foo2.com/");
console.log(util.isDeepStrictEqual(url1, url2));
// true

[regseb]

FYI There's the same problem with Promise. #55198 (comment)

import assert from 'node:assert/strict';

const promise1 = Promise.resolve("foo");
const promise2 = Promise.resolve("bar");
assert.deepEqual(promise1, promise2);