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next-image-get-img-props.test.ts
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/* eslint-env jest */
import { getImageProps } from 'next/image'
describe('getImageProps()', () => {
let warningMessages: string[]
const originalConsoleWarn = console.warn
beforeEach(() => {
warningMessages = []
console.warn = (m: string) => {
warningMessages.push(m)
}
})
afterEach(() => {
console.warn = originalConsoleWarn
})
it('should return props in correct order', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
width: 100,
height: 200,
})
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['loading', 'lazy'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=128&q=75 1x, /_next/image?url=%2Ftest.png&w=256&q=75 2x',
],
['src', '/_next/image?url=%2Ftest.png&w=256&q=75'],
])
})
it('should handle priority', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
width: 100,
height: 200,
priority: true,
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['fetchPriority', 'high'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=128&q=75 1x, /_next/image?url=%2Ftest.png&w=256&q=75 2x',
],
['src', '/_next/image?url=%2Ftest.png&w=256&q=75'],
])
})
it('should handle quality', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
width: 100,
height: 200,
quality: 50,
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['loading', 'lazy'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=128&q=50 1x, /_next/image?url=%2Ftest.png&w=256&q=50 2x',
],
['src', '/_next/image?url=%2Ftest.png&w=256&q=50'],
])
})
it('should handle loading eager', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
width: 100,
height: 200,
loading: 'eager',
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['loading', 'eager'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=128&q=75 1x, /_next/image?url=%2Ftest.png&w=256&q=75 2x',
],
['src', '/_next/image?url=%2Ftest.png&w=256&q=75'],
])
})
it('should handle sizes', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
width: 100,
height: 200,
sizes: '100vw',
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['loading', 'lazy'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
['sizes', '100vw'],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=640&q=75 640w, /_next/image?url=%2Ftest.png&w=750&q=75 750w, /_next/image?url=%2Ftest.png&w=828&q=75 828w, /_next/image?url=%2Ftest.png&w=1080&q=75 1080w, /_next/image?url=%2Ftest.png&w=1200&q=75 1200w, /_next/image?url=%2Ftest.png&w=1920&q=75 1920w, /_next/image?url=%2Ftest.png&w=2048&q=75 2048w, /_next/image?url=%2Ftest.png&w=3840&q=75 3840w',
],
['src', '/_next/image?url=%2Ftest.png&w=3840&q=75'],
])
})
it('should handle fill', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
fill: true,
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['loading', 'lazy'],
['decoding', 'async'],
[
'style',
{
bottom: 0,
color: 'transparent',
height: '100%',
left: 0,
objectFit: undefined,
objectPosition: undefined,
position: 'absolute',
right: 0,
top: 0,
width: '100%',
},
],
['sizes', '100vw'],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=640&q=75 640w, /_next/image?url=%2Ftest.png&w=750&q=75 750w, /_next/image?url=%2Ftest.png&w=828&q=75 828w, /_next/image?url=%2Ftest.png&w=1080&q=75 1080w, /_next/image?url=%2Ftest.png&w=1200&q=75 1200w, /_next/image?url=%2Ftest.png&w=1920&q=75 1920w, /_next/image?url=%2Ftest.png&w=2048&q=75 2048w, /_next/image?url=%2Ftest.png&w=3840&q=75 3840w',
],
['src', '/_next/image?url=%2Ftest.png&w=3840&q=75'],
])
})
it('should handle style', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
width: 100,
height: 200,
style: { maxWidth: '100%', height: 'auto' },
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['loading', 'lazy'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent', maxWidth: '100%', height: 'auto' }],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=128&q=75 1x, /_next/image?url=%2Ftest.png&w=256&q=75 2x',
],
['src', '/_next/image?url=%2Ftest.png&w=256&q=75'],
])
})
it('should handle loader', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
id: 'my-image',
src: '/test.png',
width: 100,
height: 200,
loader: ({ src, width, quality }) =>
`https://example.com${src}?w=${width}&q=${quality || 75}`,
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['id', 'my-image'],
['loading', 'lazy'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
[
'srcSet',
'https://example.com/test.png?w=128&q=75 1x, https://example.com/test.png?w=256&q=75 2x',
],
['src', 'https://example.com/test.png?w=256&q=75'],
])
})
it('should handle arbitrary props', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
src: '/test.png',
width: 100,
height: 200,
// @ts-ignore - testing arbitrary props
foo: true,
bar: 42,
baz: 'str',
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['foo', true],
['bar', 42],
['baz', 'str'],
['loading', 'lazy'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=128&q=75 1x, /_next/image?url=%2Ftest.png&w=256&q=75 2x',
],
['src', '/_next/image?url=%2Ftest.png&w=256&q=75'],
])
})
it('should override src', async () => {
const { props } = getImageProps({
alt: 'a nice desc',
src: '/test.png',
overrideSrc: '/override.png',
width: 100,
height: 200,
})
expect(warningMessages).toStrictEqual([])
expect(Object.entries(props)).toStrictEqual([
['alt', 'a nice desc'],
['loading', 'lazy'],
['width', 100],
['height', 200],
['decoding', 'async'],
['style', { color: 'transparent' }],
[
'srcSet',
'/_next/image?url=%2Ftest.png&w=128&q=75 1x, /_next/image?url=%2Ftest.png&w=256&q=75 2x',
],
['src', '/override.png'],
])
})
})