Function bootstrap

test/spec/helper.ts:41–63

(
  htmlUrl: string,
  cssUrl?: string,
  refImageUrl?: string,
)

}

export async function bootstrap(
  htmlUrl: string,
  cssUrl?: string,
  refImageUrl?: string,
) {
  await setup()

  const html = await fetchFile(htmlUrl)
  const captureNode = getCaptureNode()
  captureNode.innerHTML = html

  if (cssUrl) {
    const css = await fetchFile(cssUrl)
    getStyleNode().appendChild(document.createTextNode(css))
  }

  if (refImageUrl) {
    const url = await fetchFile(refImageUrl)
    getReferenceImage().setAttribute('src', url)
  }

  return captureNode
}

async function fetchFile(fileName: string) {
  const url = BASE_URL + fileName