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class-mocks-dual-import.test.ts
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class-mocks-dual-import.test.ts
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/**
* 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);
});
});