@Test
public void baseUrlNullThrows() {

    try {
        new RetroProxy.Builder().baseUrl((String) null);
        fail();
    } catch (NullPointerException e) {
        assertThat(e).hasMessage("baseUrl == null");
    }
    try {
        new RetroProxy.Builder().baseUrl((HttpUrl) null);
        fail();
    } catch (NullPointerException e) {
        assertThat(e).hasMessage("baseUrl == null");
    }
}