Iterable equality within object

packages/expect/src/__tests__/utils.test.js

@@ -271,6 +271,49 @@ describe('iterableEquality', () => {
     ).toBe(false);
   });
 
+  test('returns true when given iterator within equal objects', () => {
+    const a = {
+      [Symbol.iterator]: () => ({next: () => ({done: true})}),
+      a: [],
+    };
+    const b = {
+      [Symbol.iterator]: () => ({next: () => ({done: true})}),
+      a: [],
+    };
+
+    expect(iterableEquality(a, b)).toEqual(true);
+  });
+
+  test('returns false when given iterator within inequal objects', () => {
+    const a = {
+      [Symbol.iterator]: () => ({next: () => ({done: true})}),
+      a: [1],
+    };
+    const b = {
+      [Symbol.iterator]: () => ({next: () => ({done: true})}),
+      a: [],
+    };
+
+    expect(iterableEquality(a, b)).toEqual(false);
+  });
+
+  test('returns false when given iterator within inequal nested objects', () => {
+    const a = {
+      [Symbol.iterator]: () => ({next: () => ({done: true})}),
+      a: {
+        b: [1],
+      },
+    };
+    const b = {
+      [Symbol.iterator]: () => ({next: () => ({done: true})}),
+      a: {
+        b: [],
+      },
+    };
+
+    expect(iterableEquality(a, b)).toEqual(false);
+  });
+
   test('returns true when given circular Set shape', () => {
     const a1 = new Set();
     const a2 = new Set();

packages/expect/src/utils.ts

@@ -251,6 +251,14 @@ export const iterableEquality = (
     return false;
   }
 
+  if (!emptyObject(a) && !emptyObject(b)) {
+    const aEntries = Object.entries(a);
+    const bEntries = Object.entries(b);
+    if (!equals(aEntries, bEntries)) {
+      return false;
+    }
+  }
+
   // Remove the first value from the stack of traversed values.
   aStack.pop();
   bStack.pop();