react-native-vector-icons/MaterialIcons jest-expo 快照测试错误与打字稿
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【中文标题】react-native-vector-icons/MaterialIcons jest-expo 快照测试错误与打字稿【英文标题】:react-native-vector-icons/MaterialIcons jest-expo snapshot test error with typescript 【发布时间】:2020-08-21 16:24:11 【问题描述】:我在学习玩笑,使用 react-native 和 expo 编写我的第一个组件快照测试。我可以在没有来自组件内的“react-native-vector-icons/MaterialIcons”的图标组件的情况下运行测试。但是,当我尝试使用上述图标组件运行测试时,出现以下错误:
ReferenceError: You are trying to `import` a file after the Jest environment has been torn down.
at Object.get Text [as Text] (node_modules/react-native/Libraries/react-native/react-native-implementation.js:118:12)
at Icon.render (node_modules/@expo/vector-icons/build/vendor/react-native-vector-icons/lib/create-icon-set.js:120:58)
at finishClassComponent (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:7618:31)
at updateClassComponent (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:7568:24)
at beginWork (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:9043:16)
Cannot log after tests are done. Did you forget to wait for something async in your test?
Attempted to log "Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/functio
n (for composite components) but got: object. You likely forgot to export your component from the file it's defined in, or you might
have mixed up default and named imports.
Check the render method of `Icon`.
in Icon (created by Icon)
in Icon".
我的测试代码如下:
import React from 'react'
import * as Icon from 'react-native-vector-icons/MaterialIcons'
import renderer from 'react-test-renderer'
it('Renders an icon', () =>
const tree = renderer.create(
<Icon.default
size=20
color= 'grey'
name= true ? 'check-box' : 'check-box-outline-blank'
/>
).toJSON()
expect(tree).toMatchSnapshot();
)
我在 package.json 中的玩笑配置是这样的:
"jest":
"preset": "jest-expo",
"transformIgnorePatterns": [
"node_modules/(?!((jest-)?react-native|react-clone-referenced-element|expo(nent)?|@expo(nent)?/.*|react-navigation|react-native-vector-icons|@unimodules))"
],
"testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
"moduleFileExtensions": [
"ts",
"tsx",
"js",
"jsx",
"json",
"android.ts",
"android.tsx"
]
,
组件在测试之外运行良好。
【问题讨论】:
不直接导入 Icon 有什么原因吗?难道你不能import Icon from 'react-native-vector-icons/MaterialIcons'
并使用<Icon>
而不是<Icon.default>
吗?
是的,我最初就是这样做的。在尝试帮助修复它的过程中,我将其更改为上述方式。无论哪种方式;默认或命名导入导致相同的错误。
【参考方案1】:
在仔细阅读了 jest 文档后,我找到了一种解决方法,即使用 mocks。
只需将以下内容添加到测试中似乎就可以解决问题:
jest.mock('react-native-vector-icons/MaterialIcons', () => 'Icon')
【讨论】:
我也这样做了,但是,现在我有一个错误 TypeError: _MaterialIcons.default.loadFont is not a function。任何想法如何解决这个问题?以上是关于react-native-vector-icons/MaterialIcons jest-expo 快照测试错误与打字稿的主要内容,如果未能解决你的问题,请参考以下文章
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react-native-vector-icons/MaterialIcons jest-expo 快照测试错误与打字稿