react-native-template/changeme/__mock__/mockRealmObject.js

import { SystemEntity } from "../src/realm/entities/System";
import { UserEntity } from "../src/realm/entities/User";

export default class MockRealm{

  constructor(params){
    this.schemaVersion = params.schemaVersion;
    this[SystemEntity.name] = [];
    this[UserEntity.name] = [];
    this.deletedKeys = [];
  }

  create(repoName, entity){
    this[repoName].push(entity);
  }

  objects(repoName){
    let objects = this[repoName];
    objects.filtered = this.filtered ? this.filtered.bind(this, repoName) : () => objects;
    objects.sorted = this.sorted ? this.sorted.bind(this, repoName) : () => objects;
    return objects;
  }

  write(callback){
    callback();
  }

  delete(key){
    this.deletedKeys.push(key);
  }

  static defaultPath = '';
  static schemaVersion(path, key){
    if (path === 'negTest') {
      return -1;
    } else if (path === 'breakDB') {
      throw 'Existing DB is broken';
    } else {
      return 0;
    }
  }

  close(){
    return null;
  }
}