@Test public void renamerSouldNotReplaceExistingNewKeys() {

    initPrefs(
        "colour", "red",
        "vegetable", "eggplant",
        "couleur", "bleu",
        "legume", "tomate",
        "network", true,
        "connection", "wifi"
    );
    PrefMigrator.migrate(prefs, RENAMERS);
    assertPrefs(
        "colour", "red",
        "vegetable", "eggplant",
        "couleur", "bleu",
        "legume", "tomate",
        "network", true,
        "connection", "wifi"
    );
}