Mock a file input onChange event for testing

mockFileUpload.js

export default const mockFileUpload = (fileInput, fileUrl) => new Promise((resolve, reject) => {
	try {
		const xhr = new XMLHttpRequest()
		xhr.open('GET', fileUrl, true)
		xhr.responseType = 'blob'
		xhr.onload = (e) => {
			if (xhr.status == 200) {
				fileInput.files[0] = xhr.response
				const mockEvent = document.createEvent('HTMLEvents')
				mockEvent.initEvent('change', true, true)
				fileInput.dispatchEvent(mockEvent)
				resolve()
			} else {
				throw new Error('Error fetching file')
			}
		}
		xhr.send()
	} catch (error) {
		reject(error)
	}
})