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gatsby-ssr.spec.ts
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gatsby-ssr.spec.ts
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import { onPreRenderHTML, onRenderBody } from './gatsby-ssr'
import Spy = jasmine.Spy
import { headComponentsData, postBodyComponentsData, scriptsData } from './fake-data.spec'
describe('gatsby-ssr.js', () => {
describe('onRenderBody', () => {
it('throws an error when no scripts are passed in', function () {
expect(() => { onRenderBody({}) }).toThrow(new Error('gatsby-plugin-no-javascript: Gatsby removed an internal detail that this plugin relied upon, please submit this issue to https://www.github.com/itmayziii/gatsby-plugin-no-javascript.'))
})
})
describe('onPreRenderHTML', () => {
let replaceHeadComponentsSpy: Spy
let replacePostBodyComponentsSpy: Spy
beforeEach(() => {
replaceHeadComponentsSpy = jasmine.createSpy<any>('replaceHeadComponents')
replacePostBodyComponentsSpy = jasmine.createSpy<any>('replacePostBodyComponents')
})
it('does not remove non react components from the head, (checks for props)', function () {
function getHeadComponents () {
return [headComponentsData[2], headComponentsData[3]]
}
function getPostBodyComponents () {
return []
}
onPreRenderHTML({ getHeadComponents, replaceHeadComponents: replaceHeadComponentsSpy, getPostBodyComponents, replacePostBodyComponents: replacePostBodyComponentsSpy })
expect(replaceHeadComponentsSpy).toHaveBeenCalledWith([headComponentsData[2], headComponentsData[3]])
})
it('should remove static files like JSON from the head as these files are always added by Gatsby', () => {
onRenderBody({ scripts: [] })
function getHeadComponents () {
return [headComponentsData[0], headComponentsData[1], headComponentsData[14]]
}
function getPostBodyComponents () {
return []
}
onPreRenderHTML({ getHeadComponents, replaceHeadComponents: replaceHeadComponentsSpy, getPostBodyComponents, replacePostBodyComponents: replacePostBodyComponentsSpy })
expect(replaceHeadComponentsSpy).toHaveBeenCalledWith([headComponentsData[0], headComponentsData[1]])
})
it('should remove preload scripts from the head that are called out by Gatsby during onRenderBody', () => {
onRenderBody({ scripts: scriptsData })
function getHeadComponents () {
return [
headComponentsData[0], headComponentsData[1], headComponentsData[8], headComponentsData[9], headComponentsData[10], headComponentsData[11],
headComponentsData[12], headComponentsData[13], headComponentsData[14]
]
}
function getPostBodyComponents () {
return []
}
onPreRenderHTML({ getHeadComponents, replaceHeadComponents: replaceHeadComponentsSpy, getPostBodyComponents, replacePostBodyComponents: replacePostBodyComponentsSpy })
expect(replaceHeadComponentsSpy).toHaveBeenCalledTimes(1)
expect(replaceHeadComponentsSpy.calls.argsFor(0)[0].length).toEqual(2)
expect(replaceHeadComponentsSpy).toHaveBeenCalledWith([headComponentsData[0], headComponentsData[1]])
})
it('does not remove non react components from the body, (checks for props)', function () {
const fakeBodyComponents = [
{
type: 'link',
key: 'styles-module1.css'
},
{
type: 'link',
key: 'styles-module2.css'
}
]
function getHeadComponents () {
return []
}
function getPostBodyComponents () {
return fakeBodyComponents
}
onPreRenderHTML({ getHeadComponents, replaceHeadComponents: replaceHeadComponentsSpy, getPostBodyComponents, replacePostBodyComponents: replacePostBodyComponentsSpy })
expect(replacePostBodyComponentsSpy).toHaveBeenCalledWith(fakeBodyComponents)
})
it('should remove special Gatsby scripts from the body', () => {
onRenderBody({ scripts: [] })
function getHeadComponents () {
return []
}
function getPostBodyComponents () {
return [postBodyComponentsData[0], postBodyComponentsData[1], postBodyComponentsData[2]]
}
onPreRenderHTML({ getHeadComponents, replaceHeadComponents: replaceHeadComponentsSpy, getPostBodyComponents, replacePostBodyComponents: replacePostBodyComponentsSpy })
expect(replacePostBodyComponentsSpy).toHaveBeenCalledWith([postBodyComponentsData[0]])
})
it('should remove preload scripts from the body that are called out by Gatsby during onRenderBody', () => {
onRenderBody({ scripts: scriptsData })
function getHeadComponents () {
return []
}
function getPostBodyComponents () {
return [postBodyComponentsData[0], postBodyComponentsData[3], postBodyComponentsData[4], postBodyComponentsData[5], postBodyComponentsData[6], postBodyComponentsData[7]]
}
onPreRenderHTML({ getHeadComponents, replaceHeadComponents: replaceHeadComponentsSpy, getPostBodyComponents, replacePostBodyComponents: replacePostBodyComponentsSpy })
expect(replacePostBodyComponentsSpy).toHaveBeenCalledTimes(1)
expect(replacePostBodyComponentsSpy.calls.argsFor(0)[0].length).toEqual(1)
expect(replacePostBodyComponentsSpy).toHaveBeenCalledWith([postBodyComponentsData[0]])
})
})
})