失败：urls.map 不是函数

Question

以下代码测试，下载按钮链接是否损坏。如果是，测试应该失败，否则通过。但是代码抛出错误 Failed: urls.map is not a function。谁能告诉我这是为什么？

it('test if templates are downloadable', async () => {
  const links = element.all(by.xpath('//button//img[@src="url_here"]'));
  const urls = links.map(link => link.getAttribute('src'));
  const requests = urls.map(url => fetch(url));
  const responses = await Promise.all(requests);
  const statusCodes = responses.map(response => response.status);
  statusCodes.forEach(statusCode => {
  expect(statusCode).toBeLessThan(400);
  });
});

Answer 1

根据 Protractor docs the .map() function that is available on element.all result returns 解析为数组的 Promise。

所以你需要await:

it('test if templates are downloadable', async () => {
     const links = element.all(by.xpath('//button//img[@src="url_here"]'));
     const urls = await links.map(link => link.getAttribute('src')); // await here
     const requests = await urls.map(url => fetch(url)); // and await here
     const responses = await Promise.all(requests);
     const statusCodes = responses.map(response => response.status);
     statusCodes.forEach(statusCode => {
        expect(statusCode).toBeLessThan(400);
     });
});

失败：urls.map 不是函数

Failed: urls.map is not a function

javascript

automated-tests

node.js

jasmine

protractor