我有一个插件，我从一个现有项目中提取了一个vue创建的裸露项目，请参见下面的代码。插件在文档正文（src / plugin.js）中附加了一个div。它具有一个带有'test'文本的.vue组件，当单击Vue徽标（src / plugin.vue和vue-test-plugin.gif）时，该文本会更改可见性。
我能够通过src / main.js中的vm.$el.parentElement.getElementsByClassName('plugin-container')访问此插件的HTML元素，但是当我在测试文件（tests \ unit \ plugin.spec.js）中访问TypeError: Cannot read property 'getElementsByClassName' of null时，就会得到 PASS tests/unit/example.spec.js
FAIL tests/unit/plugin.spec.js
● Plugin › should change visibility when Vue image is clicked
TypeError: Cannot read property 'getElementsByClassName' of null
16 |
17 | const image = vm.$el.getElementsByTagName('img')[0];
> 18 | const pluginContainer = vm.$el.parentElement.getElementsByClassName('plugin-container').length;
| ^
19 |
20 | expect(pluginContainer).toBe(0);
21 | image.click();
at Object.getElementsByClassName (tests/unit/plugin.spec.js:18:50)
Test Suites: 1 failed, 1 passed, 2 total
Tests: 1 failed, 1 passed, 2 total
Snapshots: 0 total
Time: 2.266s
Ran all test suites.
Watch Usage: Press w to show more.
）。
(snakes) C:\Users\Acer\pypy2.7-v7.0.0-win32>pypy
Python 2.7.13 (9112c8071614, Feb 06 2019, 23:10:08)
[PyPy 7.0.0 with MSC v.1500 32 bit] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>> pypy epto.py conf_epto 1
File "<stdin>", line 1
pypy epto.py conf_epto 1
^
SyntaxError: invalid syntax
>>>>
我希望我的考试能够顺利通过。