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class-mocks-single-import.test.ts
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class-mocks-single-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, * as testTypes from './__fixtures__/class-mocks-types';
jest.mock('./__fixtures__/class-mocks-types');
describe('Testing the mocking of exported functions', () => {
it('can mock a directly exported function', () => {
jest.spyOn(testTypes, 'testFunction1').mockImplementation(() => {
return 'mockTestFunction';
});
expect(testTypes.testFunction1()).toBe('mockTestFunction');
});
it('can mock an indirectly exported function', () => {
jest.spyOn(testTypes, 'testFunction2').mockImplementation(() => {
return 'mockTestFunction';
});
expect(testTypes.testFunction2()).toBe('mockTestFunction');
});
it('can mock an indirectly exported anonymous function', () => {
jest.spyOn(testTypes, 'testFunction3').mockImplementation(() => {
return 'mockTestFunction';
});
expect(testTypes.testFunction3()).toBe('mockTestFunction');
});
});
describe('Testing the mocking of a class hierarchy defined in a single import', () => {
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(testTypes.TestClass.prototype, 'testMethod')
.mockImplementation(() => {
return 'mockTestMethod';
});
const testClassInstance = new testTypes.TestClass();
expect(testClassInstance.testMethod()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
});
it('can call an instance method named "get" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(SuperTestClass.prototype, 'get')
.mockImplementation(() => {
return 'mockTestMethod';
});
const testClassInstance = new SuperTestClass();
expect(testClassInstance.get()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call a superclass instance method named "get" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(testTypes.TestClass.prototype, 'get')
.mockImplementation(() => {
return 'mockTestMethod';
});
const testClassInstance = new testTypes.TestClass();
expect(testClassInstance.get()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call an instance method named "set" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(SuperTestClass.prototype, 'set')
.mockImplementation(() => {
return 'mockTestMethod';
});
const testClassInstance = new SuperTestClass();
expect(testClassInstance.set()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call a superclass instance method named "set" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(testTypes.TestClass.prototype, 'set')
.mockImplementation(() => {
return 'mockTestMethod';
});
const testClassInstance = new testTypes.TestClass();
expect(testClassInstance.set()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call a static method - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(SuperTestClass, 'staticTestMethod')
.mockImplementation(() => {
return 'mockTestMethod';
});
expect(SuperTestClass.staticTestMethod()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call a superclass static method - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(testTypes.TestClass, 'staticTestMethod')
.mockImplementation(() => {
return 'mockTestMethod';
});
expect(testTypes.TestClass.staticTestMethod()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
});
it('can call a static method named "get" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(SuperTestClass, 'get')
.mockImplementation(() => {
return 'mockTestMethod';
});
expect(SuperTestClass.get()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call a superclass static method named "get" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(testTypes.TestClass, 'get')
.mockImplementation(() => {
return 'mockTestMethod';
});
expect(testTypes.TestClass.get()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call a static method named "set" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(SuperTestClass, 'set')
.mockImplementation(() => {
return 'mockTestMethod';
});
expect(SuperTestClass.set()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
it('can call a superclass static method named "set" - Auto-mocked class', () => {
const mockTestMethod = jest
.spyOn(testTypes.TestClass, 'set')
.mockImplementation(() => {
return 'mockTestMethod';
});
expect(testTypes.TestClass.set()).toBe('mockTestMethod');
expect(mockTestMethod).toHaveBeenCalledTimes(1);
mockTestMethod.mockClear();
});
});