@Test
public void loadAd_shouldPropagateJsonParamsInServerExtras() throws Exception {

    subject.loadAd();
    expectedServerExtras.put("key", "value");
    expectedServerExtras.put("a different key", "a different value");
    verify(banner).loadBanner(
            any(Context.class),
            eq(subject),
            eq(expectedLocalExtras),
            eq(expectedServerExtras)
    );
}