assert: partialDeepStrictEqual works with ArrayBuffers

Fixes: nodejs#56097

Author: puskin

lib/assert.js

@@ -21,6 +21,8 @@
 'use strict';
 
 const {
+  ArrayBuffer,
+  ArrayBufferIsView,
   ArrayFrom,
   ArrayIsArray,
   ArrayPrototypeIndexOf,
@@ -38,6 +40,7 @@ const {
   ObjectIs,
   ObjectKeys,
   ObjectPrototypeIsPrototypeOf,
+  ObjectPrototypeToString,
   ReflectApply,
   ReflectHas,
   ReflectOwnKeys,
@@ -50,6 +53,7 @@ const {
   StringPrototypeSlice,
   StringPrototypeSplit,
   SymbolIterator,
+  Uint8Array,
 } = primordials;
 
 const {
@@ -73,6 +77,7 @@ const {
   isDate,
   isWeakSet,
   isWeakMap,
+  isSharedArrayBuffer,
 } = require('internal/util/types');
 const { isError, deprecate, emitExperimentalWarning } = require('internal/util');
 const { innerOk } = require('internal/assert/utils');
@@ -369,9 +374,114 @@ function isSpecial(obj) {
 }
 
 const typesToCallDeepStrictEqualWith = [
-  isKeyObject, isWeakSet, isWeakMap, Buffer.isBuffer,
+  isKeyObject, isWeakSet, isWeakMap, Buffer.isBuffer, isSharedArrayBuffer,
 ];
 
+function compareMaps(actual, expected, comparedObjects) {
+  if (actual.size !== expected.size) {
+    return false;
+  }
+  const safeIterator = FunctionPrototypeCall(SafeMap.prototype[SymbolIterator], actual);
+
+  comparedObjects ??= new SafeWeakSet();
+
+  for (const { 0: key, 1: val } of safeIterator) {
+    if (!MapPrototypeHas(expected, key)) {
+      return false;
+    }
+    if (!compareBranch(val, MapPrototypeGet(expected, key), comparedObjects)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function compareArrayBuffers(actual, expected) {
+  const actualView = ArrayBufferIsView(actual) ? actual : new Uint8Array(actual);
+  const expectedView = ArrayBufferIsView(expected) ? expected : new Uint8Array(expected);
+
+  if (ObjectPrototypeToString(actualView) !== ObjectPrototypeToString(expectedView)) {
+    return false;
+  }
+
+  // Compare the lengths of the views (not just byte length, but actual element count)
+  if (expectedView.length > actualView.length) {
+    return false;
+  }
+
+  for (let i = 0; i < expectedView.length; i++) {
+    if (actualView[i] !== expectedView[i]) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function compareSets(actual, expected, comparedObjects) {
+  if (expected.size > actual.size) {
+    return false; // `expected` can't be a subset if it has more elements
+  }
+
+  if (isDeepEqual === undefined) lazyLoadComparison();
+
+  const actualArray = ArrayFrom(FunctionPrototypeCall(SafeSet.prototype[SymbolIterator], actual));
+  const expectedIterator = FunctionPrototypeCall(SafeSet.prototype[SymbolIterator], expected);
+  const usedIndices = new SafeSet();
+
+  expectedIteration: for (const expectedItem of expectedIterator) {
+    for (let actualIdx = 0; actualIdx < actualArray.length; actualIdx++) {
+      if (!usedIndices.has(actualIdx) && isDeepStrictEqual(actualArray[actualIdx], expectedItem)) {
+        usedIndices.add(actualIdx);
+        continue expectedIteration;
+      }
+    }
+    return false;
+  }
+
+  return true;
+}
+
+function compareArrays(actual, expected, comparedObjects) {
+  if (expected.length > actual.length) {
+    return false;
+  }
+
+  if (isDeepEqual === undefined) lazyLoadComparison();
+
+  // Create a map to count occurrences of each element in the expected array
+  const expectedCounts = new SafeMap();
+  for (const expectedItem of expected) {
+    let found = false;
+    for (const { 0: key, 1: count } of expectedCounts) {
+      if (isDeepStrictEqual(key, expectedItem)) {
+        MapPrototypeSet(expectedCounts, key, count + 1);
+        found = true;
+        break;
+      }
+    }
+    if (!found) {
+      MapPrototypeSet(expectedCounts, expectedItem, 1);
+    }
+  }
+
+  // Create a map to count occurrences of relevant elements in the actual array
+  for (const actualItem of actual) {
+    for (const { 0: key, 1: count } of expectedCounts) {
+      if (isDeepStrictEqual(key, actualItem)) {
+        if (count === 1) {
+          MapPrototypeDelete(expectedCounts, key);
+        } else {
+          MapPrototypeSet(expectedCounts, key, count - 1);
+        }
+        break;
+      }
+    }
+  }
+
+  return !expectedCounts.size;
+}
+
 /**
  * Compares two objects or values recursively to check if they are equal.
  * @param {any} actual - The actual value to compare.
@@ -388,22 +498,14 @@ function compareBranch(
 ) {
   // Check for Map object equality
   if (isMap(actual) && isMap(expected)) {
-    if (actual.size !== expected.size) {
-      return false;
-    }
-    const safeIterator = FunctionPrototypeCall(SafeMap.prototype[SymbolIterator], actual);
-
-    comparedObjects ??= new SafeWeakSet();
+    return compareMaps(actual, expected, comparedObjects);
+  }
 
-    for (const { 0: key, 1: val } of safeIterator) {
-      if (!MapPrototypeHas(expected, key)) {
-        return false;
-      }
-      if (!compareBranch(val, MapPrototypeGet(expected, key), comparedObjects)) {
-        return false;
-      }
-    }
-    return true;
+  if (
+    (ArrayBufferIsView(actual) && ArrayBufferIsView(expected)) ||
+    (actual instanceof ArrayBuffer && expected instanceof ArrayBuffer)
+  ) {
+    return compareArrayBuffers(actual, expected);
   }
 
   for (const type of typesToCallDeepStrictEqualWith) {
@@ -415,68 +517,12 @@ function compareBranch(
 
   // Check for Set object equality
   if (isSet(actual) && isSet(expected)) {
-    if (expected.size > actual.size) {
-      return false; // `expected` can't be a subset if it has more elements
-    }
-
-    if (isDeepEqual === undefined) lazyLoadComparison();
-
-    const actualArray = ArrayFrom(FunctionPrototypeCall(SafeSet.prototype[SymbolIterator], actual));
-    const expectedIterator = FunctionPrototypeCall(SafeSet.prototype[SymbolIterator], expected);
-    const usedIndices = new SafeSet();
-
-    expectedIteration: for (const expectedItem of expectedIterator) {
-      for (let actualIdx = 0; actualIdx < actualArray.length; actualIdx++) {
-        if (!usedIndices.has(actualIdx) && isDeepStrictEqual(actualArray[actualIdx], expectedItem)) {
-          usedIndices.add(actualIdx);
-          continue expectedIteration;
-        }
-      }
-      return false;
-    }
-
-    return true;
+    return compareSets(actual, expected, comparedObjects);
   }
 
   // Check if expected array is a subset of actual array
   if (ArrayIsArray(actual) && ArrayIsArray(expected)) {
-    if (expected.length > actual.length) {
-      return false;
-    }
-
-    if (isDeepEqual === undefined) lazyLoadComparison();
-
-    // Create a map to count occurrences of each element in the expected array
-    const expectedCounts = new SafeMap();
-    for (const expectedItem of expected) {
-      let found = false;
-      for (const { 0: key, 1: count } of expectedCounts) {
-        if (isDeepStrictEqual(key, expectedItem)) {
-          MapPrototypeSet(expectedCounts, key, count + 1);
-          found = true;
-          break;
-        }
-      }
-      if (!found) {
-        MapPrototypeSet(expectedCounts, expectedItem, 1);
-      }
-    }
-
-    // Create a map to count occurrences of relevant elements in the actual array
-    for (const actualItem of actual) {
-      for (const { 0: key, 1: count } of expectedCounts) {
-        if (isDeepStrictEqual(key, actualItem)) {
-          if (count === 1) {
-            MapPrototypeDelete(expectedCounts, key);
-          } else {
-            MapPrototypeSet(expectedCounts, key, count - 1);
-          }
-          break;
-        }
-      }
-    }
-
-    return !expectedCounts.size;
+    return compareArrays(actual, expected, comparedObjects);
   }
 
   // Comparison done when at least one of the values is not an object

test/parallel/test-assert-objects.js

@@ -207,6 +207,16 @@ describe('Object Comparison Tests', () => {
           actual: [1, 2, 3],
           expected: ['2'],
         },
+        {
+          description: 'throws when comparing a ArrayBuffer with a SharedArrayBuffer',
+          actual: new ArrayBuffer(3),
+          expected: new SharedArrayBuffer(3),
+        },
+        {
+          description: 'throws when comparing an Int16Array with a Uint16Array',
+          actual: new Int16Array(3),
+          expected: new Uint16Array(3),
+        },
       ];
 
       if (common.hasCrypto) {
@@ -343,10 +353,15 @@ describe('Object Comparison Tests', () => {
         expected: { error: new Error('Test error') },
       },
       {
-        description: 'compares two objects with TypedArray instances with the same content',
-        actual: { typedArray: new Uint8Array([1, 2, 3]) },
+        description: 'compares two Uint8Array objects',
+        actual: { typedArray: new Uint8Array([1, 2, 3, 4, 5]) },
         expected: { typedArray: new Uint8Array([1, 2, 3]) },
       },
+      {
+        description: 'compares two Int16Array objects',
+        actual: { typedArray: new Int16Array([1, 2, 3, 4, 5]) },
+        expected: { typedArray: new Int16Array([1, 2, 3]) },
+      },
       {
         description: 'compares two Map objects with identical entries',
         actual: new Map([

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

@@ -99,6 +99,10 @@ suite('notEqualArrayPairs', () => {
         makeBlock(assert.deepStrictEqual, arrayPair[0], arrayPair[1]),
         assert.AssertionError
       );
+      assert.throws(
+        makeBlock(assert.partialDeepStrictEqual, arrayPair[0], arrayPair[1]),
+        assert.AssertionError
+      );
     });
   }
 });