fix(expect): toMatchObject(Map/Set) should expect Map/Set on left hand side

packages/expect/src/jest-utils.ts

@@ -584,6 +584,8 @@ function isObjectWithKeys(a: any) {
     && !(a instanceof Error)
     && !Array.isArray(a)
     && !(a instanceof Date)
+    && !(a instanceof Set)
+    && !(a instanceof Map)
   )
 }
 

test/core/test/jest-expect.test.ts

@@ -1342,6 +1342,29 @@ function getError(f: () => unknown) {
   return expect.unreachable()
 }
 
+it('toMatchObject', () => {
+  expect(() => expect(null).toMatchObject(new Set()))
+    .toThrowErrorMatchingInlineSnapshot(`[AssertionError: expected null to match object Set{}]`)
+  expect(() => expect(undefined).toMatchObject(new Set()))
+    .toThrowErrorMatchingInlineSnapshot(`[AssertionError: expected undefined to match object Set{}]`)
+  expect(() => expect(1234).toMatchObject(new Set()))
+    .toThrowErrorMatchingInlineSnapshot(`[AssertionError: expected 1234 to match object Set{}]`)
+  expect(() => expect('hello').toMatchObject(new Set()))
+    .toThrowErrorMatchingInlineSnapshot(`[AssertionError: expected 'hello' to match object Set{}]`)
+  expect(() => expect({}).toMatchObject(new Set()))
+    .toThrowErrorMatchingInlineSnapshot(`[AssertionError: expected {} to match object Set{}]`)
+  expect(() => expect({}).toMatchObject(new Map()))
+    .toThrowErrorMatchingInlineSnapshot(`[AssertionError: expected {} to match object Map{}]`)
+
+  // subset equality works inside Set/Map
+  expect(new Set([{ x: 1 }])).toMatchObject(new Set([{}]))
+  expect(new Map([[1, { a: 1 }]])).toMatchObject(new Map([[1, {}]]))
+
+  // Set/Map matches against empty object shape
+  expect(new Set()).toMatchObject({})
+  expect(new Map()).toMatchObject({})
+})
+
 it('toMatchObject error diff', () => {
   // single property on root (3 total properties, 1 expected)
   expect(getError(() => expect({ a: 1, b: 2, c: 3 }).toMatchObject({ c: 4 }))).toMatchInlineSnapshot(`