AppDatabase appDatabase = (AppDatabase) MigrationUtil.getDatabaseAfterPerformingMigrations(migrationTestHelper, AppDatabase.class, TEST_DB_NAME,
 MIGRATION_1_2, MIGRATION_2_3);

//Now checking if the new database contains the correctly exported data from the previous database
NotesDao migratedDataNotesDao = appDatabase.notesDao();
assertEquals(LiveDataTestUtil.getValue(migratedDataNotesDao.getNoteById(noteList.get(3).getNotesId())).getNoteDesc(),
 noteList.get(3).getNoteDesc());
assertNull(LiveDataTestUtil.getValue(migratedDataNotesDao.getNoteById(noteList.get(3).getNotesId())).getSubTitle());
appDatabase.close();