react-native-template/changeme/__tests__/DB-test.js

import { initDB } from '../src/realm/DbInit';
import DbAPI from '../src/realm/DbAPI';

test('Realm DB inits', () => {
  return initDB('negTest', 'negTest')
    .then( (dbRef) => {
      expect(dbRef).toEqual(expect.anything());
    });
});

test('Realm DB inits with no existing key', () => {
  return initDB('isNull', 'isNull')
    .then( (dbRef) => {
      expect(dbRef).toEqual(expect.anything());
    });
});

test('Realm DB inits with existing DB', () => {
  return initDB()
    .then( (dbRef) => {
      expect(dbRef).toEqual(expect.anything());
    });
});

test('Realm DB returns null after exceptions', () => {
  return initDB('breakDB', 'breakDB')
    .then( (dbRef) => {
      expect(dbRef).toEqual(null);
    });
});

test('DbAPI calls system repo getAllSystemValues()', () => {
  return initDB('isNull', 'isNull')
  .then( () => {
    let returned = DbAPI.getAllSystemValues();
    expect(returned).toEqual({});
  });
});

test('DbAPI calls system repo createSystemValue()', () => {
  return initDB('isNull', 'isNull')
  .then( () => {
    let returned = DbAPI.createSystemValue();
    expect(returned).toEqual(true);
  });
});

test('DbAPI calls system repo deleteSystemValue()', () => {
  return initDB('isNull', 'isNull')
  .then( () => {
    let returned = DbAPI.deleteSystemValue();
    expect(returned).toEqual(true);
  });
});

test('DbAPI calls system repo getSystemValue()', () => {
  return initDB('isNull', 'isNull')
  .then( () => {
    let returned = DbAPI.getSystemValue('notakey');
    expect(returned.id).toEqual(null);
  });
});