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/* eslint-env jest */
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)
})
})
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