realm-js: Testing with Jest not working

I got

> spring2016@0.0.1 test /Users/keen/dev/work_native/spring2016
> jest

Using Jest CLI v0.10.0, jasmine2, babel-jest
 FAIL  __tests__/hackathon-test.js
● Runtime Error
TypeError: Cannot read property 'debugHosts' of undefined
    at Object.<anonymous> (/Users/keen/dev/work_native/spring2016/node_modules/realm/lib/browser/index.js:30:69)
    at Object.<anonymous> (/Users/keen/dev/work_native/spring2016/node_modules/realm/lib/index.js:29:18)
    at Object.<anonymous> (/Users/keen/dev/work_native/spring2016/services/hack-service.js:2:12)
    at Object.<anonymous> (/Users/keen/dev/work_native/spring2016/__tests__/hackathon-test.js:5:18)
npm ERR! Test failed.  See above for more details.

message.

My Package.json is shown below.

{
  "name": "spring2016",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },
  "dependencies": {
    "react-native": "^0.21.0",
    "react-native-action-button": "^1.1.3",
    "react-native-facebook-login": "^1.0.3",
    "react-native-image-picker": "^0.18.3",
    "react-native-list-popover": "^1.0.5",
    "react-native-material-design": "^0.3.3",
    "react-native-material-kit": "^0.3.0",
    "react-native-vector-icons": "^1.3.2",
    "realm": "^0.11.0"
  },
  "rnpm": {
    "ios": {
      "project": "ios/spring2016.xcodeproj"
    }
  },
  "jest": {
    "setupEnvScriptFile": "<rootDir>/node_modules/react-native/jestSupport/env.js",
    "testPathIgnorePatterns": [
      "/node_modules/",
      "packager/react-packager/src/Activity/"
    ],
    "testFileExtensions": [
      "js"
    ],
    "unmockedModulePathPatterns": [
      "promise",
      "source-map",
      "<rootDir>/node_modules/react-native",
      "<rootDir>/node_modules/realm"
    ]
  },
  "devDependencies": {
    "babel-jest": "*",
    "babel-preset-react-native": "^1.5.6",
    "jest-cli": "*",
    "react-native": "^0.21.0"
  }
}

https://gist.github.com/ehrudxo/684b5aeb7211c18237092aece45f29fb

and .babelrc is like

{ “presets”: [“react-native”] }

About this issue

Original URL
State: closed
Created 8 years ago
Comments: 24 (6 by maintainers)

Most upvoted comments

Thanks @hybrisCole for a basic mock. I created one for my use based on this. https://gist.github.com/hyb175/beb9ceed4c34300ba7c77d3d6d44ae52

hyb175 on May 19, 2017

I have this very basic realm mock

export default class Realm {
    schema: any = [];
    data: any = [];
    constructor(params: any) {
        require('lodash').each(params.schema, (schema) => {
            this.data[schema.name] = [];
            this.data[schema.name].filtered = () => {
                return this.data[schema.name];
            };
        });
        this.schema = params.schema;
    }
    objects(schemaName) {
        return this.data[schemaName];
    }
    write(fn) {
        fn();
    }
    create(schemaName, data) {
        this.data[schemaName].push(data);
        return data;
    }
};

jest.mock('realm', () => {
    return require('../../mocks/realm').default;
});

That .default is bc I’m on typescript heh, you should take it away if you go with es*

hybrisCole on Jan 6, 2017

when i first use realm in for app, the Simulator show undefined is not an object (evaluating ‘_NativeModules$Realm.debugHosts’).Can i get any solutions to fix this bug ?

wjyx1lalala on Dec 14, 2016