| |
| import { loadGetInitialProps } from 'next/dist/shared/lib/utils' |
|
|
| describe('loadGetInitialProps', () => { |
| it('should throw if getInitialProps is defined as an instance method', () => { |
| class TestComponent { |
| getInitialProps() {} |
| } |
| const rejectPromise = loadGetInitialProps(TestComponent as any, {}) |
| const error = new Error( |
| '"TestComponent.getInitialProps()" is defined as an instance method - visit https://nextjs.org/docs/messages/get-initial-props-as-an-instance-method for more information.' |
| ) |
| return expect(rejectPromise).rejects.toEqual(error) |
| }) |
|
|
| it('should resolve to an empty object if getInitialProps is missing', async () => { |
| const result = await loadGetInitialProps((() => {}) as any, {}) |
| expect(result).toEqual({}) |
| }) |
|
|
| it('should resolve getInitialProps', async () => { |
| class TestComponent { |
| static async getInitialProps() { |
| return { foo: 1 } |
| } |
| } |
| const result = await loadGetInitialProps(TestComponent as any, {}) |
| expect(result).toEqual({ foo: 1 }) |
| }) |
|
|
| it('should be able to return an invalid value if the request was already sent', async () => { |
| class TestComponent { |
| static async getInitialProps() { |
| return 'invalidValue' |
| } |
| } |
| const ctx: any = { |
| res: { |
| finished: true, |
| }, |
| } |
| const result = await loadGetInitialProps(TestComponent as any, ctx) |
| expect(result).toBe('invalidValue') |
| }) |
|
|
| it("should throw if getInitialProps won't return an object ", () => { |
| class TestComponent { |
| static async getInitialProps() {} |
| } |
| const rejectPromise = loadGetInitialProps(TestComponent as any, {}) |
| const error = new Error( |
| '"TestComponent.getInitialProps()" should resolve to an object. But found "undefined" instead.' |
| ) |
| return expect(rejectPromise).rejects.toEqual(error) |
| }) |
| }) |
|
|
