squarenotsquare/squarenotsquare/__tests__/Migration-test.js

import { System } from "../src/realm/entities/System";
import { migratev0 } from "../src/realm/migrations/MigrateV0";
import { migratev1 } from "../src/realm/migrations/MigrateV1";
import { MockRealm } from "../__mock__/mockRealmObject";

test('Realm migrates to V0', () => {
    let oldRealm = new MockRealm(0);
    let newRealm = new MockRealm(0);
    migratev0(oldRealm, newRealm);
    expect(newRealm.schemaVersion).toBe(0);
})

test('Realm migrates to V1', () => {
    let oldRealm = new MockRealm(0);
    let newRealm = new MockRealm(0);
    migratev0(oldRealm, newRealm);

    oldRealm = newRealm;
    newRealm = new MockRealm(1);
    migratev1(oldRealm, newRealm);

    expect(newRealm[System.name][0].key).toBe('username');
    expect(newRealm[System.name][0].value).toBe('changeme');
})