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assert: use Same-value equality in deepStrictEqual · nodejs/node@b0d3bec · GitHub

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assert: use Same-value equality in deepStrictEqual
PR-URL: #15398 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Rich Trott <rtrott@gmail.com>
1 parent ca2c73c commit b0d3bec

4 files changed

Lines changed: 48 additions & 17 deletions

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‎doc/api/assert.md‎

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Original file line numberDiff line numberDiff line change
@@ -142,6 +142,7 @@ Generally identical to `assert.deepEqual()` with a few exceptions:
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the [Strict Equality Comparison][] too.
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3. [Type tags][Object.prototype.toString()] of objects should be the same.
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4. [Object wrappers][] are compared both as objects and unwrapped values.
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5. `0` and `-0` are not considered equal.
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```js
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const assert = require('assert');
@@ -179,6 +180,11 @@ assert.deepStrictEqual(new Number(1), new Number(2));
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// Fails because the wrapped number is unwrapped and compared as well.
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assert.deepStrictEqual(new String('foo'), Object('foo'));
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// OK because the object and the string are identical when unwrapped.
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assert.deepStrictEqual(-0, -0);
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// OK
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assert.deepStrictEqual(0, -0);
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// AssertionError: 0 deepStrictEqual -0
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```
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If the values are not equal, an `AssertionError` is thrown with a `message`
@@ -438,6 +444,9 @@ parameter is an instance of an `Error` then it will be thrown instead of the
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<!-- YAML
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added: v1.2.0
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changes:
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/REPLACEME
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description: -0 and +0 are not considered equal anymore.
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- version: REPLACEME
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pr-url: https://github.com/nodejs/node/pull/15036
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description: NaN is now compared using the [SameValueZero][] comparison.

‎lib/assert.js‎

Lines changed: 13 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -118,12 +118,12 @@ function areSimilarRegExps(a, b) {
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// For small buffers it's faster to compare the buffer in a loop. The c++
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// barrier including the Uint8Array operation takes the advantage of the faster
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// binary compare otherwise. The break even point was at about 300 characters.
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function areSimilarTypedArrays(a, b) {
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function areSimilarTypedArrays(a, b, max) {
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const len = a.byteLength;
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if (len !== b.byteLength) {
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return false;
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}
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if (len < 300) {
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if (len < max) {
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for (var offset = 0; offset < len; offset++) {
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if (a[offset] !== b[offset]) {
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return false;
@@ -160,10 +160,7 @@ function isObjectOrArrayTag(tag) {
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// reasonable to interpret their underlying memory in the same way,
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// which is checked by comparing their type tags.
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// (e.g. a Uint8Array and a Uint16Array with the same memory content
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// could still be different because they will be interpreted differently)
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// Never perform binary comparisons for Float*Arrays, though,
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// since e.g. +0 === -0 is true despite the two values' bit patterns
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// not being identical.
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// could still be different because they will be interpreted differently).
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//
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// For strict comparison, objects should have
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// a) The same built-in type tags
@@ -211,8 +208,9 @@ function strictDeepEqual(actual, expected) {
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if (actual.message !== expected.message) {
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return false;
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}
214-
} else if (!isFloatTypedArrayTag(actualTag) && ArrayBuffer.isView(actual)) {
215-
if (!areSimilarTypedArrays(actual, expected)) {
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} else if (ArrayBuffer.isView(actual)) {
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if (!areSimilarTypedArrays(actual, expected,
213+
isFloatTypedArrayTag(actualTag) ? 0 : 300)) {
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return false;
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}
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// Buffer.compare returns true, so actual.length === expected.length
@@ -266,9 +264,10 @@ function looseDeepEqual(actual, expected) {
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const actualTag = objectToString(actual);
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const expectedTag = objectToString(expected);
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if (actualTag === expectedTag) {
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if (!isObjectOrArrayTag(actualTag) && !isFloatTypedArrayTag(actualTag) &&
270-
ArrayBuffer.isView(actual)) {
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return areSimilarTypedArrays(actual, expected);
267+
if (!isObjectOrArrayTag(actualTag) && ArrayBuffer.isView(actual)) {
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return areSimilarTypedArrays(actual, expected,
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isFloatTypedArrayTag(actualTag) ?
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Infinity : 300);
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}
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// Ensure reflexivity of deepEqual with `arguments` objects.
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// See https://github.com/nodejs/node-v0.x-archive/pull/7178
@@ -280,7 +279,9 @@ function looseDeepEqual(actual, expected) {
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function innerDeepEqual(actual, expected, strict, memos) {
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// All identical values are equivalent, as determined by ===.
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if (actual === expected) {
283-
return true;
282+
if (actual !== 0)
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return true;
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return strict ? Object.is(actual, expected) : true;
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}
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// Returns a boolean if (not) equal and undefined in case we have to check

‎test/parallel/test-assert-deep.js‎

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@@ -507,5 +507,8 @@ assert.doesNotThrow(
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boxedSymbol.slow = true;
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assertNotDeepOrStrict(boxedSymbol, {});
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}
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// Minus zero
511+
assertOnlyDeepEqual(0, -0);
512+
assertDeepAndStrictEqual(-0, -0);
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/* eslint-enable */

‎test/parallel/test-assert-typedarray-deepequal.js‎

Lines changed: 23 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -20,16 +20,20 @@ const equalArrayPairs = [
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[new Int32Array(1e5), new Int32Array(1e5)],
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[new Float32Array(1e5), new Float32Array(1e5)],
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[new Float64Array(1e5), new Float64Array(1e5)],
23-
[new Int16Array(256), new Uint16Array(256)],
24-
[new Int16Array([256]), new Uint16Array([256])],
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[new Float32Array([+0.0]), new Float32Array([-0.0])],
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[new Float64Array([+0.0]), new Float32Array([-0.0])],
27-
[new Float64Array([+0.0]), new Float64Array([-0.0])],
23+
[new Float32Array([+0.0]), new Float32Array([+0.0])],
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[new Uint8Array([1, 2, 3, 4]).subarray(1), new Uint8Array([2, 3, 4])],
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[new Uint16Array([1, 2, 3, 4]).subarray(1), new Uint16Array([2, 3, 4])],
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[new Uint32Array([1, 2, 3, 4]).subarray(1, 3), new Uint32Array([2, 3])]
3127
];
3228

29+
const looseEqualArrayPairs = [
30+
[new Float64Array([+0.0]), new Float32Array([-0.0])],
31+
[new Int16Array(256), new Uint16Array(256)],
32+
[new Int16Array([256]), new Uint16Array([256])],
33+
[new Float32Array([+0.0]), new Float32Array([-0.0])],
34+
[new Float64Array([+0.0]), new Float64Array([-0.0])]
35+
];
36+
3337
const notEqualArrayPairs = [
3438
[new Uint8Array(2), new Uint8Array(3)],
3539
[new Uint8Array([1, 2, 3]), new Uint8Array([4, 5, 6])],
@@ -46,6 +50,16 @@ const notEqualArrayPairs = [
4650
equalArrayPairs.forEach((arrayPair) => {
4751
// eslint-disable-next-line no-restricted-properties
4852
assert.deepEqual(arrayPair[0], arrayPair[1]);
53+
assert.deepStrictEqual(arrayPair[0], arrayPair[1]);
54+
});
55+
56+
looseEqualArrayPairs.forEach((arrayPair) => {
57+
// eslint-disable-next-line no-restricted-properties
58+
assert.deepEqual(arrayPair[0], arrayPair[1]);
59+
assert.throws(
60+
makeBlock(assert.deepStrictEqual, arrayPair[0], arrayPair[1]),
61+
assert.AssertionError
62+
);
4963
});
5064

5165
notEqualArrayPairs.forEach((arrayPair) => {
@@ -54,4 +68,8 @@ notEqualArrayPairs.forEach((arrayPair) => {
5468
makeBlock(assert.deepEqual, arrayPair[0], arrayPair[1]),
5569
assert.AssertionError
5670
);
71+
assert.throws(
72+
makeBlock(assert.deepStrictEqual, arrayPair[0], arrayPair[1]),
73+
assert.AssertionError
74+
);
5775
});

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