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How to mock static methods and non static methods using Jest
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| export class MockedClass { | |
| public instanceMethod(): string { | |
| return "instance"; | |
| } | |
| public static staticMethod(): string { | |
| return "static"; | |
| } | |
| } |
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| import {MockedClass} from './mocked-class' | |
| jest.mock('./mocked-class'); | |
| describe('TestClass', () => { | |
| it ('should mock instance method', () => { | |
| const expectedValue: string = 'instanceMocked' | |
| MockedClass.mockImplementation(() => { | |
| return { | |
| instanceMethod: () => expectedValue | |
| }; | |
| }); | |
| const actualValue: string = new TestClass().callStaticMethod(); | |
| expect(actualValue).toBe(expectedValue); | |
| }); | |
| it ('should mock static method', () => { | |
| const expectedValue: string = 'staticMocked' | |
| MockedClass.staticMethod.mockImplementation(() => expectedValue); | |
| const actualValue: string = new TestClass().callStaticMethod(); | |
| expect(actualValue).toBe(expectedValue); | |
| }); | |
| }); |
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| import {MockedClass} from './mocked-class' | |
| export class TestClass { | |
| public callInstanceMethod(): string { | |
| return new MockedClass().instanceMethod(); | |
| } | |
| public callStaticMethod(): string { | |
| return MockedClass.staticMethod(); | |
| } | |
| } |
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Thanks. Yes, you're right. Fixed it and thanks again.