I've been struggling to set up testing for my React Native Typescript Components using Jest. Despite searching through various examples and solutions (such as this one, that one, another link, etc.), I still can't seem to get it working. Even following the setup outlined in the sample project here (with additional info from this source) or trying another example project like this one has not yielded any success.
While some setups allow me to run basic tests, importing a Component results in the following error:
● Test suite failed to run
Jest encountered an unexpected token
This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
Here's what you can do:
• If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
• To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
• If you need a custom transformation specify a "transform" option in your config.
• If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.
You'll find more details and examples of these config options in the docs:
https://jestjs.io/docs/en/configuration.html
Details:
/Users/XXX/node_modules/react-native-iphone-x-helper/index.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import { Dimensions, Platform, StatusBar } from 'react-native';
^^^^^^
SyntaxError: Cannot use import statement outside a module
at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1350:14)
at Object.<anonymous> (node_modules/react-native-paper/lib/commonjs/components/BottomNavigation.tsx:13:1)
File contents:
jest.config.js
module.exports = {
preset: 'react-native',
moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node']
}
package.json "jest"
"jest": {
"preset": "react-native",
"transform": {
"^.+\\.js$": "<rootDir>/node_modules/react-native/jest/preprocessor.js",
"\\.(ts|tsx)$": "ts-jest"
},
"globals": {
"ts-jest": {
"tsConfig": "tsconfig.jest.json"
}
},
"moduleFileExtensions": [
"ts",
"tsx",
"js"
],
"testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$"
}
tsconfig.json
{"compilerOptions": {
"target": "es6",
"module": "commonjs",
"allowJs": true,
"jsx": "react-native",
"noEmit": true,
"strict": true,
"noUnusedLocals": true,
"noUnusedParameters": true,
"noImplicitReturns": true,
"noFallthroughCasesInSwitch": true,
"moduleResolution": "node",
"allowSyntheticDefaultImports": true,
"esModuleInterop": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true
}, "include": [
"src"
]}
If anyone could provide me with a functional example, I would greatly appreciate it.