javascript - 如果使用 Cypress 的 CLI 命令中未声明参数之一，会引发异常吗？

Question

实际结果是: 我刚刚运行，等了半个小时也没有任何反应。

预期结果是: 如果缺少特定参数，则抛出特定异常。

我目前没有任何错误消息。如果我尝试使用例如 PAGE_TITLE 等于 undefined 来运行它，则不会发生任何情况。

尝试过的场景: 我将位于 package.json、docker:test-data-creation:add-widgets 中的所有常量放入名为 requiredFields 的常量数组中，然后从 validateParameters 函数调用 requiredFields，该函数因未知原因而不起作用。

显示一些代码: 这是我使用特定参数调用 --spec 的地方

    "docker:test-data-creation:add-widgets": "XSOCK=/tmp/.X11-unix && XAUTH=/tmp/.docker.xauth && xauth nlist :0 | sed -e 's/^..../ffff/' | xauth -f $XAUTH nmerge - && chmod 755 $XAUTH && docker run --rm -it -v $XSOCK:$XSOCK -v $XAUTH:$XAUTH -e XAUTHORITY=/tmp/.docker.xauth -e DISPLAY=$DISPLAY --network=sity_static-network -v $PWD:/test -w /test cypress/included:3.8.1 --browser chrome --env baseUrl=http://symfony.local,PAGE_TITLE='Slider Swiper Widget Test',MAX_WIDGETS_IN_PAGE=50,TOTAL_WIDGETS_COUNT=250,WIDGET_TYPE='SliderSwiper',WIDGETS_WITH_ROWS=50 --spec 'cypress/integration/creation/dynamically_add_widgets_spec.js'" 

如果dynamic_add_widgets_spec.js部分

   * Name of the page where you like to save this widgets
   */
  const PAGE_TITLE = Cypress.env('PAGE_TITLE');

  /**
   * Maximum widgets in the page
   */
  const MAX_WIDGETS_IN_PAGE = Cypress.env('MAX_WIDGETS_IN_PAGE');

  /**
   * Number of total widgets to be added to the page
   */
  const TOTAL_WIDGETS_COUNT = Cypress.env('TOTAL_WIDGETS_COUNT');

  /**
   * Just change the type of the widget to select your needed widget
   */
  const WIDGET_TYPE = Cypress.env('WIDGET_TYPE');

  /**
   * This variable is needed because we want to build some widgets with rows and some widgets don't need rows. The number below is how many widgets one need with rows.
   */
  const WIDGETS_WITH_ROWS = Cypress.env('WIDGETS_WITH_ROWS');

  /**
   * This is a variable that is used to count needed widgets with rows. This variable should always stay 0.
   */
  let ROWS_COUNTER = 0;

  /**
   * This constant is used to determine if all required fields are declared in the cli command
   */
  const requiredFields = [
    PAGE_TITLE,
    MAX_WIDGETS_IN_PAGE,
    TOTAL_WIDGETS_COUNT,
    WIDGET_TYPE,
    WIDGETS_WITH_ROWS
  ];

这是我调用它的地方

context("Dynamically create widgets", () => {
    validateParameters(requiredFields);
    createWidgets(WIDGET_TYPE, TOTAL_WIDGETS_COUNT, MAX_WIDGETS_IN_PAGE, WIDGETS_WITH_ROWS);
  }); 

validateParameters 函数 -->

  function validateParameters(requiredFields) {
    requiredFields.forEach((field) => {
      if (Cypress.env(field) !== undefined) {
        return;
      }
      throw {message: `Field ${field} is required. Please provide it using --env ${field}. Please look at README.md for an example.`};
    })
  }

附注我知道这个 forEach 无法工作，因为如果缺少特定参数，我需要一条特定消息，但我试图获取此消息，然后在缺少特定参数时获取特定消息。

Answer 1

问题是在 validateParameters 函数中您传递了常量数组。每个常量都有值，例如 PAGE_TITLE = Cypress.env('PAGE_TITLE');所以它将是 .env 中定义的任何内容。这可能是字符串、数字、未定义或其他内容。

要解决问题，您需要检查传递的字段是否未定义。

function validateParameters(requiredFields) {
    requiredFields.forEach((field) => {
      if (field !== undefined) {
        return;
      }
      throw {message: `Field ${field} is required. Please provide it using --env ${field}. Please look at README.md for an example.`};
    })
  }