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next.js/test/unit/getDisplayName.test.js

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/* global describe, it, expect */
import { Component } from 'react'
import { getDisplayName } from '../../dist/lib/utils'
describe('getDisplayName', () => {
it('gets the proper display name of a component', () => {
class ComponentOne extends Component {
render () {
return null
}
}
class ComponentTwo extends Component {
static displayName = 'CustomDisplayName'
render () {
return null
}
}
function FunctionalComponent () {
return null
}
expect(getDisplayName(ComponentOne)).toBe('ComponentOne')
expect(getDisplayName(ComponentTwo)).toBe('CustomDisplayName')
expect(getDisplayName(FunctionalComponent)).toBe('FunctionalComponent')
expect(getDisplayName(() => null)).toBe('Unknown')
expect(getDisplayName('div')).toBe('div')
})
})