@react-google-maps/api/src/__tests__/utils/injectscript.test.ts

React.js Google Maps API integration

import { injectScript } from '../../utils/injectscript'

interface WindowWithGoogleMap extends Window {
  initMap?: () => void;
}

describe('utils/injectScript', () => {

  describe('injectScript', () => {
    it('adds a script to the page with id and src attributes that correspond to the id and url properties', () => {
      const url = `http://localhost/script1.js`
      const value = injectScript({
        id: 'injectScript-test1',
        url,
      })


      setTimeout(() => {
        const win: WindowWithGoogleMap = window
        if(win.initMap) {
          win.initMap()
        }
      }, 0)

      const element = document.querySelector('#injectScript-test1')
      expect(element).toBeTruthy()
      expect(element).toHaveProperty('src', url)
      return value
    })

    it('returns a promise which resolves when the script loads', () => {
      const id = 'injectScript-test2'
      const url = `http://localhost/script2.js`

      setTimeout(() => {
        const win: WindowWithGoogleMap = window
        if(win.initMap) {
          win.initMap()
        }
      }, 0)

      return injectScript({
        id,
        url,
      })
        .then(value => expect(value).toBeTruthy())
    })

    describe('duplicate calls with matching id and url properties', () => {
      it('do not add another script element to the page', () => {
        const id = 'injectScript-test4'
        const url = 'http://localhost/script4.js'

        injectScript({
          id,
          url,
        })

        const value = injectScript({
          id,
          url,
        })


        setTimeout(() => {
          const win: WindowWithGoogleMap = window
          if(win.initMap) {
            win.initMap()
          }
        }, 0)

        expect(document.querySelectorAll(`script[src="${url}"]`)).toHaveProperty('length', 1)
        return value
      })

      it('do not resolve in successive calls unless the script has actually loaded from the first call', () => {
        const id = 'injectScript-test5'
        const url = 'http://localhost/script5.js'
        let initMapCalled = false

        const value1 = injectScript({
          id,
          url,
        })

        const value2 = injectScript({
          id,
          url
        })

        setTimeout(() => {
          const win: WindowWithGoogleMap = window
          if(win.initMap) {
            initMapCalled = true
            win.initMap()
          }
        }, 50)

        return value2.then(() => {
          expect(initMapCalled).toBe(true)
          return value1
        })
      })

    })
  })
})