Jest Testing with TypeORM - react-native

Question

I'm trying to get Jest working with the TypeORM Expo-Example project
I've done a lot to try to get either ts-jest as well as expo-jest working. I have followed official guides for both Jest and Expo Jest. I was able to expo init a new empty project (not the TypeORM example) and get Expo-Jest working as expected, but when I to apply the changes to the TypeORM expo project, it ran into issues.
I think expo-jest is preferred. It will probably be easier to start from a clean clone of the TypeORM Expo-Example repo.
I've edited the package.json to a version that shouldn't have dependency issues if it is an easier starting point. (the jest stuff can be modified or removed in favor of separate config)
{
"name": "expo-example",
"version": "0.1.0",
"private": true,
"devDependencies": {
"#babel/core": "^7.18.0",
"#babel/preset-env": "^7.18.0",
"#types/jest": "^27.5.1",
"#types/node": "^10.1.3",
"#types/react": "~17.0.21",
"#types/react-native": "~0.67.6",
"#types/react-test-renderer": "^16.0.1",
"babel-plugin-transform-typescript-metadata": "^0.3.2",
"jest": "27",
"jest-expo": "^45.0.1",
"react-native-typescript-transformer": "^1.2.9",
"react-test-renderer": "17",
"typescript": "^4.6.4"
},
"scripts": {
"start": "expo start --dev-client",
"eject": "expo eject",
"android": "expo run:android",
"ios": "expo run:ios",
"test": "jest",
"postinstall": "patch-package"
},
"jest": {
"preset": "jest-expo",
"moduleFileExtensions": [
"ts",
"tsx",
"js"
],
"transform": {
"^.+\\.(js)$": "<rootDir>/node_modules/babel-jest",
"\\.(ts|tsx)$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
},
"testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
"testPathIgnorePatterns": [
"\\.snap$",
"<rootDir>/node_modules/"
],
"cacheDirectory": ".jest/cache",
"transformIgnorePatterns": [
"node_modules/(?!((jest-)?react-native|#react-native(-community)?)|expo(nent)?|#expo(nent)?/.*|#expo-google-fonts/.*|react-navigation|#react-navigation/.*|#unimodules/.*|unimodules|sentry-expo|native-base|react-native-svg)"
]
},
"dependencies": {
"babel-jest": "27",
"expo": "^45.0.0",
"expo-splash-screen": "~0.15.1",
"expo-sqlite": "~10.2.0",
"expo-status-bar": "~1.3.0",
"patch-package": "^6.4.7",
"postinstall-postinstall": "^2.1.0",
"react": "17.0.2",
"react-dom": "17.0.2",
"react-native": "0.68.1",
"react-native-sqlite-storage": "^4.1.0",
"react-native-web": "0.17.7",
"reflect-metadata": "^0.1.13",
"ts-jest": "27",
"tslib": "^1.9.1",
"typeorm": "^0.3.6"
}
}

Answer 1

I have the same issue, my problem is an error when i try test the return of getConnection() typeorm function or DataSource({...}).initialize() with expo-sqlite driver... to make it work i use slite3 lib instead expo-sqlite... so it work, see: https://github.com/EmanuelVogt/expo-sqlite-typeorm-jest