Fix not addressing to Sets as object without keys

CHANGELOG.md

@@ -42,6 +42,7 @@
 - `[@jest/expect-utils]` [**BREAKING**] exclude non-enumerable in object matching ([#14670](https://github.com/jestjs/jest/pull/14670))
 - `[@jest/expect-utils]` Fix comparison of `URL` ([#14672](https://github.com/jestjs/jest/pull/14672))
 - `[@jest/expect-utils]` Check `Symbol` properties in equality ([#14688](https://github.com/jestjs/jest/pull/14688))
+- `[@jest/expect-utils]` Fix not addressing to Sets as objects without keys ([#14873](https://github.com/jestjs/jest/pull/14873))
 - `[jest-leak-detector]` Make leak-detector more aggressive when running GC ([#14526](https://github.com/jestjs/jest/pull/14526))
 - `[jest-runtime]` Properly handle re-exported native modules in ESM via CJS ([#14589](https://github.com/jestjs/jest/pull/14589))
 - `[jest-util]` Make sure `isInteractive` works in a browser ([#14552](https://github.com/jestjs/jest/pull/14552))

packages/expect-utils/src/__tests__/utils.test.ts

@@ -401,6 +401,34 @@ describe('subsetEquality()', () => {
       });
     });
   });
+
+  describe('subset is not object with keys', () => {
+    test('returns true if subset has keys', () => {
+      expect(subsetEquality({foo: 'bar'}, {foo: 'bar'})).toBe(true);
+    });
+    test('returns true if subset has Symbols', () => {
+      const symbol = Symbol('foo');
+      expect(subsetEquality({[symbol]: 'bar'}, {[symbol]: 'bar'})).toBe(true);
+    });
+    test('returns undefined if subset has no keys', () => {
+      expect(subsetEquality('foo', 'bar')).toBeUndefined();
+    });
+    test('returns undefined if subset is null', () => {
+      expect(subsetEquality({foo: 'bar'}, null)).toBeUndefined();
+    });
+    test('returns undefined if subset is Error', () => {
+      expect(subsetEquality({foo: 'bar'}, new Error())).toBeUndefined();
+    });
+    test('returns undefined if subset is Array', () => {
+      expect(subsetEquality({foo: 'bar'}, [])).toBeUndefined();
+    });
+    test('returns undefined if subset is Date', () => {
+      expect(subsetEquality({foo: 'bar'}, new Date())).toBeUndefined();
+    });
+    test('returns undefined if subset is Set', () => {
+      expect(subsetEquality({foo: 'bar'}, new Set())).toBeUndefined();
+    });
+  });
 });
 
 describe('iterableEquality', () => {

packages/expect-utils/src/utils.ts

@@ -336,7 +336,8 @@ const isObjectWithKeys = (a: any) =>
   isObject(a) &&
   !(a instanceof Error) &&
   !Array.isArray(a) &&
-  !(a instanceof Date);
+  !(a instanceof Date) &&
+  !(a instanceof Set);
 
 export const subsetEquality = (
   object: unknown,