@Test public void translatorShouldSplitKeyAccordingToValue() {

    initPrefs("fruit", "pear_anjou");
    PrefMigrator.migrate(prefs, KEY_SPLITTER);
    assertPrefs("pear", "anjou");
    initPrefs("fruit", "melon_watermelon");
    PrefMigrator.migrate(prefs, KEY_SPLITTER);
    assertPrefs("melon", "watermelon");
}