/
gatsby-image.browser.tsx
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/
gatsby-image.browser.tsx
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/**
* @jest-environment jsdom
*/
import React from "react"
import { render, waitFor } from "@testing-library/react"
import * as hooks from "../hooks"
import type { IGatsbyImageData } from "../gatsby-image.browser"
// Prevents terser for bailing because we're not in a babel plugin
jest.mock(
`../../../macros/terser.macro`,
() =>
(strs): string =>
strs.join(``)
)
let count = 0
function generateImage(): IGatsbyImageData {
return {
width: 100,
height: 100,
layout: `fullWidth`,
images: {
fallback: { src: `some-src-fallback-${count++}.jpg`, sizes: `192x192` },
},
placeholder: { sources: [] },
backgroundColor: `red`,
}
}
describe(`GatsbyImage browser`, () => {
let beforeHydrationContent: HTMLDivElement
let image: IGatsbyImageData
let GatsbyImage
beforeEach(() => {
console.warn = jest.fn()
console.error = jest.fn()
global.SERVER = true
global.GATSBY___IMAGE = true
GatsbyImage = require(`../gatsby-image.browser`).GatsbyImage
image = generateImage()
beforeHydrationContent = document.createElement(`div`)
beforeHydrationContent.innerHTML = `
<div
class="gatsby-image-wrapper gatsby-image-wrapper-constrained"
data-gatsby-image-wrapper=""
style="position: relative;"
>
<div
style="max-width: 100px; display: block;"
>
<img
alt=""
aria-hidden="true"
role="presentation"
src="data:image/svg+xml;charset=utf-8,%3Csvg height='100' width='100' xmlns='http://www.w3.org/2000/svg' version='1.1'%3E%3C/svg%3E"
style="max-width: 100%; display: block; position: static;"
/>
</div>
<div
aria-hidden="true"
data-placeholder-image=""
sources=""
style="opacity: 1; transition: opacity 500ms linear; display: inline-block; background-color: red; position: relative;"
/>
<img
alt="A fake image for testing purpose"
data-gatsby-image-ssr=""
data-main-image=""
data-src="some-src-fallback.jpg"
decoding="async"
loading="lazy"
sizes="192x192"
style="opacity: 0;"
/>
</div>`
})
afterEach(() => {
jest.clearAllMocks()
global.SERVER = undefined
global.GATSBY___IMAGE = undefined
process.env.NODE_ENV = `test`
})
it(`shows a suggestion to switch to the new gatsby-image API when available`, async () => {
global.GATSBY___IMAGE = undefined
process.env.NODE_ENV = `development`
const { container } = render(
<GatsbyImage image={image} alt="Alt content" />
)
await waitFor(() => container.querySelector(`[data-placeholder-image=""]`))
expect(console.warn).toBeCalledWith(
`[gatsby-plugin-image] You're missing out on some cool performance features. Please add "gatsby-plugin-image" to your gatsby-config.js`
)
})
it(`shows nothing when the image props is not passed`, async () => {
process.env.NODE_ENV = `development`
// Allows to get rid of typescript error when not passing image
// This is helpful for user using JavaScript and not getting advent of
// TS types
const GatsbyImageAny = GatsbyImage as React.FC
const { container } = render(<GatsbyImageAny />)
await waitFor(() => container.querySelector(`[data-placeholder-image=""]`))
expect(console.warn).toBeCalledWith(
`[gatsby-plugin-image] Missing image prop`
)
expect(container.firstChild).toBeNull()
})
it(`cleans up the DOM when unmounting`, async () => {
;(hooks as any).hasNativeLazyLoadSupport = (): boolean => false
const { container, unmount } = render(
<GatsbyImage image={image} alt="Alt content" />
)
await waitFor(() => container.querySelector(`[data-placeholder-image=""]`))
unmount()
expect(container).toMatchInlineSnapshot(`<div />`)
})
it(`does nothing on first server hydration`, async () => {
// In this scenario,
// hasSSRHtml is true and resolved through "beforeHydrationContent" and hydrate: true
// hydrated.current is false and not resolved yet
;(hooks as any).hasNativeLazyLoadSupport = (): boolean => true
const { container } = render(
<GatsbyImage image={image} alt="Alt content" />,
{ container: beforeHydrationContent, hydrate: true }
)
const placeholder = await waitFor(
() =>
container.querySelector(`[data-placeholder-image=""]`) as HTMLElement
)
const mainImage = container.querySelector(
`[data-main-image=""]`
) as HTMLElement
expect(placeholder).toBeDefined()
expect(mainImage).toBeDefined()
expect(placeholder.style.opacity).toBe(`1`)
expect(mainImage.style.opacity).toBe(`0`)
})
it(`relies on native lazy loading when the SSR element exists and that the browser supports native lazy loading`, async () => {
const onStartLoadSpy = jest.fn()
const onLoadSpy = jest.fn()
// In this scenario,
// hasSSRHtml is true and resolved through "beforeHydrationContent" and hydrate: true
;(hooks as any).hasNativeLazyLoadSupport = (): boolean => true
const { container } = render(
<GatsbyImage
image={generateImage()}
alt="Alt content"
onStartLoad={onStartLoadSpy}
onLoad={onLoadSpy}
/>,
{ container: beforeHydrationContent, hydrate: true }
)
const img = await waitFor(() =>
container.querySelector(`[data-main-image=""]`)
)
img?.dispatchEvent(new Event(`load`))
expect(onStartLoadSpy).toBeCalledWith({ wasCached: true })
expect(onLoadSpy).toBeCalled()
})
})