fix: mocking of getters/setters on automatically mocked classes (jest…

…js#13398)

CHANGELOG.md

@@ -9,6 +9,7 @@
 ### Fixes
 
 - `[babel-plugin-jest-hoist]` Ignore `TSTypeQuery` when checking for hoisted references ([#13367](https://github.com/facebook/jest/pull/13367))
+- `[jest-mock]` Fix mocking of getters and setters on classes ([#13398](https://github.com/facebook/jest/pull/13398))
 - `[jest-reporters]` Revert: Transform file paths into hyperlinks ([#13399](https://github.com/facebook/jest/pull/13399))
 - `[@jest/types]` Infer type of `each` table correctly when the table is a tuple or array ([#13381](https://github.com/facebook/jest/pull/13381))
 - `[@jest/types]` Rework typings to allow the `*ReturnedWith` matchers to be called with no argument ([#13385](https://github.com/facebook/jest/pull/13385))

packages/jest-mock/src/__tests__/__fixtures__/SuperTestClass.ts

@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+
+export class SuperTestClass {
+  static staticTestProperty = 'staticTestProperty';
+
+  static get staticTestAccessor(): string {
+    return 'staticTestAccessor';
+  }
+
+  static set staticTestAccessor(_x: string) {
+    return;
+  }
+
+  static staticTestMethod(): string {
+    return 'staticTestMethod';
+  }
+
+  testProperty = 'testProperty';
+
+  get testAccessor(): string {
+    return 'testAccessor';
+  }
+  set testAccessor(_x: string) {
+    return;
+  }
+
+  testMethod(): string {
+    return 'testMethod';
+  }
+}

packages/jest-mock/src/__tests__/__fixtures__/TestClass.ts

@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+
+import {SuperTestClass} from './SuperTestClass';
+
+export default class TestClass extends SuperTestClass {}

packages/jest-mock/src/__tests__/__fixtures__/class-mocks-types.ts

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+
+export default class SuperTestClass {
+  static staticTestProperty = 'staticTestProperty';
+
+  static get staticTestAccessor(): string {
+    return 'staticTestAccessor';
+  }
+
+  static set staticTestAccessor(_x: string) {
+    return;
+  }
+
+  static staticTestMethod(): string {
+    return 'staticTestMethod';
+  }
+
+  static get(): string {
+    return 'get';
+  }
+
+  static set(): string {
+    return 'set';
+  }
+
+  testProperty = 'testProperty';
+
+  get testAccessor(): string {
+    return 'testAccessor';
+  }
+  set testAccessor(_x: string) {
+    return;
+  }
+
+  testMethod(): string {
+    return 'testMethod';
+  }
+
+  get(): string {
+    return 'get';
+  }
+
+  set(): string {
+    return 'set';
+  }
+}
+
+export class TestClass extends SuperTestClass {}

packages/jest-mock/src/__tests__/class-mocks-dual-import.test.ts

@@ -0,0 +1,130 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+
+import {SuperTestClass} from './__fixtures__/SuperTestClass';
+import TestClass from './__fixtures__/TestClass';
+jest.mock('./__fixtures__/SuperTestClass');
+jest.mock('./__fixtures__/TestClass');
+
+describe('Testing the mocking of a class hierarchy defined in multiple imports', () => {
+  it('can call an instance method - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(SuperTestClass.prototype, 'testMethod')
+      .mockImplementation(() => {
+        return 'mockTestMethod';
+      });
+    const testClassInstance = new SuperTestClass();
+    expect(testClassInstance.testMethod()).toBe('mockTestMethod');
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+
+    mockTestMethod.mockClear();
+  });
+
+  it('can call a superclass instance method - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(TestClass.prototype, 'testMethod')
+      .mockImplementation(() => {
+        return 'mockTestMethod';
+      });
+    const testClassInstance = new TestClass();
+    expect(testClassInstance.testMethod()).toBe('mockTestMethod');
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+  });
+
+  it('can read a value from an instance getter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(SuperTestClass.prototype, 'testAccessor', 'get')
+      .mockImplementation(() => {
+        return 'mockTestAccessor';
+      });
+    const testClassInstance = new SuperTestClass();
+    expect(testClassInstance.testAccessor).toBe('mockTestAccessor');
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+
+    mockTestMethod.mockClear();
+  });
+
+  it('can read a value from a superclass instance getter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(TestClass.prototype, 'testAccessor', 'get')
+      .mockImplementation(() => {
+        return 'mockTestAccessor';
+      });
+    const testClassInstance = new TestClass();
+    expect(testClassInstance.testAccessor).toBe('mockTestAccessor');
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+  });
+
+  it('can write a value to an instance setter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(SuperTestClass.prototype, 'testAccessor', 'set')
+      .mockImplementation((_x: string) => {
+        return () => {};
+      });
+    const testClassInstance = new SuperTestClass();
+    testClassInstance.testAccessor = '';
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+
+    mockTestMethod.mockClear();
+  });
+
+  it('can write a value to a superclass instance setter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(TestClass.prototype, 'testAccessor', 'set')
+      .mockImplementation((_x: string) => {
+        return () => {};
+      });
+    const testClassInstance = new TestClass();
+    testClassInstance.testAccessor = '';
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+  });
+
+  it('can read a value from a static getter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(SuperTestClass, 'staticTestAccessor', 'get')
+      .mockImplementation(() => {
+        return 'mockStaticTestAccessor';
+      });
+    expect(SuperTestClass.staticTestAccessor).toBe('mockStaticTestAccessor');
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+
+    mockTestMethod.mockClear();
+  });
+
+  it('can read a value from a superclass static getter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(TestClass, 'staticTestAccessor', 'get')
+      .mockImplementation(() => {
+        return 'mockStaticTestAccessor';
+      });
+    expect(TestClass.staticTestAccessor).toBe('mockStaticTestAccessor');
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+  });
+
+  it('can write a value to a static setter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(SuperTestClass, 'staticTestAccessor', 'set')
+      .mockImplementation((_x: string) => {
+        return () => {};
+      });
+    SuperTestClass.staticTestAccessor = '';
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+
+    mockTestMethod.mockClear();
+  });
+
+  it('can write a value to a superclass static setter - Auto-mocked class', () => {
+    const mockTestMethod = jest
+      .spyOn(TestClass, 'staticTestAccessor', 'set')
+      .mockImplementation((_x: string) => {
+        return () => {};
+      });
+    TestClass.staticTestAccessor = '';
+    expect(mockTestMethod).toHaveBeenCalledTimes(1);
+  });
+});