compare objects with Symbol keys (jestjs#3437)

* compare objects with Symbol keys

* Update symbol-in-objects-test.js

packages/jest-matchers/src/__tests__/symbol-in-objects-test.js

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @emails oncall+jsinfra
+ */
+
+'use strict';
+
+describe('Symbol in objects', () => {
+  test('should compare objects with Symbol keys', () => {
+    const sym = Symbol('foo');
+    const obj1 = {[sym]: 'one'};
+    const obj2 = {[sym]: 'two'};
+    const obj3 = {[sym]: 'one'};
+
+    expect(obj1).toEqual(obj3);
+    expect(obj1).not.toEqual(obj2);
+  });
+
+  test('should compare objects with mixed keys and Symbol', () => {
+    const sym = Symbol('foo2');
+    const obj1 = {foo: 2, [sym]: 'one'};
+    const obj2 = {foo: 2, [sym]: 'two'};
+    const obj3 = {foo: 2, [sym]: 'one'};
+
+    expect(obj1).toEqual(obj3);
+    expect(obj1).not.toEqual(obj2);
+  });
+
+  test('should compare objects with different Symbol keys', () => {
+    const sym = Symbol('foo');
+    const sym2 = Symbol('foo');
+    const obj1 = {[sym]: 'one'};
+    const obj2 = {[sym2]: 'one'};
+    const obj3 = {[sym]: 'one'};
+
+    expect(obj1).toEqual(obj3);
+    expect(obj1).not.toEqual(obj2);
+  });
+});

packages/jest-matchers/src/jasmine-utils.js

@@ -215,7 +215,7 @@ function keys(obj, isArray) {
         keys.push(key);
       }
     }
-    return keys;
+    return keys.concat(Object.getOwnPropertySymbols(o));
   })(obj);
 
   if (!isArray) {