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next.js/test/unit/loadGetInitialProps.test.js

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/* global describe, it, expect */
import { loadGetInitialProps } from '../../dist/lib/utils'
describe('loadGetInitialProps', () => {
it('should throw if getInitialProps is defined as an instance method', () => {
class TestComponent {
getInitialProps () {}
}
const rejectPromise = loadGetInitialProps(TestComponent, {})
const error = new Error('"TestComponent.getInitialProps()" is defined as an instance method - visit https://err.sh/zeit/next.js/get-initial-props-as-an-instance-method for more information.')
return expect(rejectPromise).rejects.toEqual(error)
})
it('should resolve to an object if getInitialProps is missing', async () => {
const result = await loadGetInitialProps(() => {}, {})
expect(result).toEqual({})
})
it('should resolve getInitialProps', async () => {
class TestComponent {
static async getInitialProps () {
return { foo: 1 }
}
}
const result = await loadGetInitialProps(TestComponent, {})
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 = {
res: {
finished: true
}
}
const result = await loadGetInitialProps(TestComponent, ctx)
expect(result).toBe('invalidValue')
})
it('should throw if getInitialProps won\'t return an object ', () => {
class TestComponent {
static async getInitialProps () {}
}
const rejectPromise = loadGetInitialProps(TestComponent, {})
const error = new Error('"TestComponent.getInitialProps()" should resolve to an object. But found "undefined" instead.')
return expect(rejectPromise).rejects.toEqual(error)
})
})