@Test
void metaOn() {

    assertNotNull(generator.metaOn(Document.of(), String.class));
    assertNotNull(generator.metaOn(Document.of(), String.class, DocumentView.class));
    assertNotNull(generator.metaOn(Document.of()));
    assertNotNull(generator.metaOn(new ArrayList<>()));
    assertNotNull(generator.metaOn(new ArrayList<>(), String.class));
    assertNotNull(generator.metaOn(new ArrayList<>(), String.class, DocumentView.class));
}