Use has package and getOwnPropertyDescriptor

Author: koba04

packages/enzyme-test-suite/test/Utils-spec.jsx

@@ -576,5 +576,18 @@ describe('Utils', () => {
         expect(target.incrementAndGet()).to.equal(4);
       });
     });
+    it('should be able to restore the property descriptor', () => {
+      const obj = {};
+      const descriptor = {
+        configurable: true,
+        enumerable: true,
+        writable: true,
+        value: () => {},
+      };
+      Object.defineProperty(obj, 'method', descriptor);
+      const spy = spyMethod(obj, 'method');
+      spy.restore();
+      expect(Object.getOwnPropertyDescriptor(obj, 'method')).to.deep.equal(descriptor);
+    });
   });
 });

packages/enzyme/package.json

@@ -33,6 +33,7 @@
   "dependencies": {
     "cheerio": "^1.0.0-rc.2",
     "function.prototype.name": "^1.0.3",
+    "has": "^1.0.1",
     "is-subset": "^0.1.1",
     "lodash": "^4.17.4",
     "object-is": "^1.0.1",

packages/enzyme/src/Utils.js

@@ -3,6 +3,7 @@ import isEqual from 'lodash/isEqual';
 import is from 'object-is';
 import entries from 'object.entries';
 import functionName from 'function.prototype.name';
+import has from 'has';
 import configuration from './configuration';
 import validateAdapter from './validateAdapter';
 
@@ -270,7 +271,11 @@ export function cloneElement(adapter, el, props) {
 export function spyMethod(instance, methodName) {
   let lastReturnValue;
   const originalMethod = instance[methodName];
-  const hasOwn = Object.hasOwnProperty.call(instance, methodName);
+  const hasOwn = has(instance, methodName);
+  let descriptor;
+  if (hasOwn) {
+    descriptor = Object.getOwnPropertyDescriptor(instance, methodName);
+  }
   Object.defineProperty(instance, methodName, {
     configurable: true,
     enumerable: false,
@@ -283,9 +288,13 @@ export function spyMethod(instance, methodName) {
   return {
     restore() {
       if (hasOwn) {
-        /* eslint-disable no-param-reassign */
-        instance[methodName] = originalMethod;
-        /* eslint-enable no-param-reassign */
+        if (descriptor) {
+          Object.defineProperty(instance, methodName, descriptor);
+        } else {
+          /* eslint-disable no-param-reassign */
+          instance[methodName] = originalMethod;
+          /* eslint-enable no-param-reassign */
+        }
       } else {
         /* eslint-disable no-param-reassign */
         delete instance[methodName];