Mock inherited static properties and methods (#6921)

* Mocked inherited static properties and methods * Update CHANGELOG.md
jestjs · Aug 30, 2018 · c1d9c2e · c1d9c2e
1 parent 66560c3
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -12,6 +12,7 @@
 - `[jest-cli]` Fix incorrect `testEnvironmentOptions` warning ([#6852](https://github.com/facebook/jest/pull/6852))
 - `[jest-each]` Prevent done callback being supplied to describe ([#6843](https://github.com/facebook/jest/pull/6843))
 - `[jest-config]` Better error message for a case when a preset module was found, but no `jest-preset.js` or `jest-preset.json` at the root ([#6863](https://github.com/facebook/jest/pull/6863))
+- `[jest-mock]` Fix inheritance of static properties and methods in mocks ([#6921](https://github.com/facebook/jest/pull/6921))
 
 ### Chore & Maintenance
 

diff --git a/packages/jest-mock/src/__tests__/jest_mock.test.js b/packages/jest-mock/src/__tests__/jest_mock.test.js
@@ -185,6 +185,24 @@ describe('moduleMocker', () => {
  expect(instanceFooMock.toString.mock).not.toBeUndefined();
  });
 
+ it('mocks ES2015 non-enumerable static properties and methods', () => {
+ class ClassFoo {
+ static foo() {}
+ }
+ ClassFoo.fooProp = () => {};
+
+ class ClassBar extends ClassFoo {}
+
+ const ClassBarMock = moduleMocker.generateFromMetadata(
+ moduleMocker.getMetadata(ClassBar),
+ );
+
+ expect(typeof ClassBarMock.foo).toBe('function');
+ expect(typeof ClassBarMock.fooProp).toBe('function');
+ expect(ClassBarMock.foo.mock).not.toBeUndefined();
+ expect(ClassBarMock.fooProp.mock).not.toBeUndefined();
+ });
+
  it('mocks methods that are bound multiple times', () => {
  const func = function func() {};
  const multipleBoundFunc = func.bind(null).bind(null);

diff --git a/packages/jest-mock/src/index.js b/packages/jest-mock/src/index.js
@@ -690,7 +690,9 @@ class ModuleMockerClass {
  if (
  (!component.hasOwnProperty && component[slot] !== undefined) ||
  (component.hasOwnProperty && component.hasOwnProperty(slot)) ||
- (type === 'object' && component[slot] != Object.prototype[slot])
+ (type === 'object' && component[slot] != Object.prototype[slot]) ||
+ // $FlowFixMe `Function` definition does not include `prototype`
+ (type === 'function' && component[slot] != Function.prototype[slot])
  ) {
  const slotMetadata = this.getMetadata(component[slot], refs);
  if (slotMetadata) {