assert: add deep equal check for more Error type #51805

kylo5aby · 2024-02-19T09:08:53Z

add deep equal check for the cases below:

Error with cause property: new Error('msg', { cause: xxx })
AggregateError: new AggregateError([err1, err2, ...], 'msg')

BridgeAR

This is already looking very promising!

The documentation still needs an update (we describe what properties we check in addition to enumerable ones) and I left improvement suggestions for edge cases.

BridgeAR · 2024-02-19T09:45:39Z

lib/internal/util/comparisons.js

      return false;
    }
+    if (val1 instanceof AggregateError && val2 instanceof AggregateError) {


The instanceof check will work in most cases while it would not detect AggregateErrors created in a different context/realm (e.g., by creating errors in a context created by vm.createContext()). I believe it is fine to just always check for this property, in case it is not already an enumerable property.

This check would currently miss the case, if either side is an AggregateError and the other is not. That could be addressed in a similar way as I suggested above about the enumerable property.

BridgeAR · 2024-02-19T10:01:22Z

lib/internal/util/comparisons.js

@@ -237,9 +238,15 @@ function innerDeepEqual(val1, val2, strict, memos) {
    // is otherwise identical.
    if ((!isNativeError(val2) && !(val2 instanceof Error)) ||
        val1.message !== val2.message ||
-        val1.name !== val2.name) {
+        val1.name !== val2.name ||
+        !innerDeepEqual(val1.cause, val2.cause, strict, memos)) {


This is definitely the right check as long the property is non-enumerable. If it is enumerable, we'd do the check twice and this could be costly and a lot of errors are created in the wild with a cause property set as an enumerable one.

In addition, we should also verify that the properties have the same enumerability. We don't yet do that for name and message, but that would be beneficial.

const cause1Enumerable = ObjectPrototypePropertyIsEnumerable(val1, 'cause'); if (cause1Enumerable !== ObjectPrototypePropertyIsEnumerable(val2, 'cause') || !cause1Enumerable && !innerDeepEqual(val1.cause, val2.cause, strict, memos)) { return false; }

BridgeAR · 2024-02-19T10:06:30Z

test/parallel/test-assert-deep.js

+  const e3 = new Error('e1');
+  const e4 = new AggregateError([e1, e2], 'Aggregate Error');
+  const e5 = new AggregateError([e1], 'Aggregate Error');
+  const e6 = new AggregateError([e1, e2], 'Aggregate Error');


Nit (just a general suggestion without need to follow-up upon): the variable names could be changed in a way that it's clearer what they stand for. E.g., this one could be:

Suggested change

const e6 = new AggregateError([e1, e2], 'Aggregate Error');

const e4duplicate = new AggregateError([e1, e2], 'Aggregate Error');

That way it would be easy to understand in the comparison that the entries are meant to be identical.

kylo5aby · 2024-02-20T06:05:19Z

@BridgeAR Thanks for your suggestion!

kylo5aby · 2024-02-23T07:21:36Z

@BridgeAR, I have update based on Non-Enumerable properties on Error, PTAL feel free

atlowChemi · 2024-03-04T15:02:21Z

lib/internal/util/comparisons.js

+    if ((message1Enumerable !== ObjectPrototypePropertyIsEnumerable(val2, 'message') ||
+          (!message1Enumerable && val1.message !== val2.message)) ||
+        (name1Enumerable !== ObjectPrototypePropertyIsEnumerable(val2, 'name') ||
+          (!name1Enumerable && val1.name !== val2.name)) ||


As far as I can tell, this means now we only compare the name and message fields when they are enumerable, which specificaly opposite from the documentation, and is a breaking change...

As far as I can tell, this means now we only compare the name and message fields when they are enumerable, which specificaly opposite from the documentation, and is a breaking change...

FWIK, As mentioned in ECMAScript 2025, name, message, cause and errors are all non-enumerable, so in the judgement above, I just compared the attributes whether they have same enumerable property, if it's same and they are non-enumerable, then compare the attributes contents.

So if the attributes are enumerable(for example in a custom Error), the next check keyCheck will check them, in the doc change, I have just added errors, and causes attributes, and didn't change name and message, I think its doesn't break the doc, have I missed something?

If it was a breaking change, I would expect we would see test failures.

kylo5aby · 2024-03-18T03:04:41Z

@legendecas PTAL

legendecas

Would you mind adding an item to the change list in the YAML frontmatter as well? Such as:

<!-- YAML
changes:
  - version: REPLACEME
    pr-url: https://github.com/nodejs/node/pull/51805
    description: Error cause property is now compared as well.
--->

doc/api/assert.md

legendecas · 2024-03-18T07:57:41Z

test/parallel/test-assert-deep.js

+  const e2 = new Error('err', { cause: new Error('cause e2') });
+  assertNotDeepOrStrict(e1, e2, AssertionError);
+  assertNotDeepOrStrict(e1, new Error('err'), AssertionError);
+  assertDeepAndStrictEqual(e1, new Error('err', { cause: new Error('cause e1') }), AssertionError);


assertDeepAndStrictEqual only accepts two arguments.

Suggested change

assertDeepAndStrictEqual(e1, new Error('err', { cause: new Error('cause e1') }), AssertionError);

assertDeepAndStrictEqual(e1, new Error('err', { cause: new Error('cause e1') }));

legendecas · 2024-03-18T07:57:49Z

test/parallel/test-assert-deep.js

+  const e4 = new AggregateError([e1], 'Aggregate Error');
+  assertNotDeepOrStrict(e1, e3, AssertionError);
+  assertNotDeepOrStrict(e3, e4, AssertionError);
+  assertDeepAndStrictEqual(e3, e3duplicate, AssertionError);


Suggested change

assertDeepAndStrictEqual(e3, e3duplicate, AssertionError);

assertDeepAndStrictEqual(e3, e3duplicate);

legendecas · 2024-03-18T16:49:39Z

doc/api/assert.md

-* [`Error`][] names and messages are always compared, even if these are not
-  enumerable properties.
+* [`Error`][] names, messages and causes are always compared, even if these are
+  not enumerable properties. For `AggregateError`, non-enumerable property


I believe the actual behavior unconditionally compares the errors property regardless of whether the error instance is an AggregateError or not. This could be reworded as

* [`Error`][] names, messages, causes, and errors are always compared, even if these are not enumerable properties.

Resolved. Thanks for the reminder

nodejs-github-bot · 2024-05-11T15:33:34Z

CI: https://ci.nodejs.org/job/node-test-pull-request/59119/

nodejs-github-bot · 2024-05-12T08:58:34Z

CI: https://ci.nodejs.org/job/node-test-pull-request/59158/

nodejs-github-bot · 2024-05-12T18:03:44Z

CI: https://ci.nodejs.org/job/node-test-pull-request/59181/

nodejs-github-bot · 2024-05-12T19:21:00Z

CI: https://ci.nodejs.org/job/node-test-pull-request/59187/

nodejs-github-bot · 2024-05-12T19:46:14Z

Landed in c8a4f70

PR-URL: #51805 Fixes: #51793 Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

PR-URL: nodejs#51805 Fixes: nodejs#51793 Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

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assert: add deep equal check for more Error type

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assert: add deep equal check for more Error type

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PR-URL: #51805 Fixes: #51793 Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

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v22.2.0 release proposal #52971

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This was referenced Jun 12, 2024

The "cause" property of Error is ignored when matching vitest-dev/vitest#5697

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fix(expect)!: check more properties for error equality vitest-dev/vitest#5876

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assert: add deep equal check for more Error type

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PR-URL: #51805 Fixes: #51793 Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

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PR-URL: #51805 Fixes: #51793 Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

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assert: add deep equal check for more Error type #51805

assert: add deep equal check for more Error type #51805

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	const e6 = new AggregateError([e1, e2], 'Aggregate Error');
	const e4duplicate = new AggregateError([e1, e2], 'Aggregate Error');

	assertDeepAndStrictEqual(e1, new Error('err', { cause: new Error('cause e1') }), AssertionError);
	assertDeepAndStrictEqual(e1, new Error('err', { cause: new Error('cause e1') }));

	assertDeepAndStrictEqual(e3, e3duplicate, AssertionError);
	assertDeepAndStrictEqual(e3, e3duplicate);

assert: add deep equal check for more Error type #51805

assert: add deep equal check for more Error type #51805

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