使用Jest测试时，node_modules / react-native / Libraries / Modal / Modal.js中的错误

Question

我正在用Jest做一个简单的快照测试，只是得到这个错误：

home.test.js

import React from 'react';
import Home from './index';
import renderer from 'react-test-renderer';

it('renders home', ()=> {
  const view = renderer.create(
    <Home></Home>
  ).toJSON();
  expect(view).toMatchSnapshot();
});

不幸的是，我不知道这是什么问题。 我认为测试写得很好。

任何帮助都会很棒。

Answer 1

我如何解决该错误使测试无法运行的问题

遇到此错误，导致我的测试无法运行

 错误页面

经过数小时的无奈之后，我两次删除了node_modules文件夹，并通过Stackoverflow和Google重新安装并搜寻了它，但没有任何解决方案，于是，我决定创建一个新的CRNA项目，看看它是否也会遇到同样的问题。 当我看到新存储库中不存在问题时，我使用以下步骤使其正常工作：

1. 再次删除node_modules文件夹
2. 升级了我的package.json文件，其关键更改如下所示：

```{

"devDependencies": {
        "react-native-scripts": "1.5.0",
        "jest-expo": "^21.0.2",
        "react-test-renderer": "16.0.0-alpha.12"
    },


"jest": {
        "preset": "jest-expo",
        "transformIgnorePatterns": [
                "node_modules/(?!react-native|expo|react-navigation|native-base-shoutem-theme|@shoutem/theme|@shoutem/animation|@shoutem/ui|tcomb-form-native)"
         ]
    },


"dependencies": {
                "react-native": “0.48.4”,
        "expo": "^21.0.2",
        "react": "16.0.0-alpha.12"
    },

3. The core difference was in upgrading react-native from 0.48.0 to 0.48.4; react-native-scripts from 1.2.1 to 1.5.0 and including the transformIgnorePatterns under the jest option. NOTE: The portion from *native-base* in the transformIgnorePatterns was included because I used NativeBase in the project. 4. I then added a .babelrc with the following details:

{
        "presets": ["babel-preset-expo"],
        "env": {
                "development": {
                    "plugins": ["transform-react-jsx-source"]
             }
         }
    }

```5.现在运行测试给我结果：

ing 通过测试所有测试均为绿色