ReadableStringSet keyCheck = CollectionUtils.newStringSet("A", "B", "C");
ReadableStringSet toIgnore = CollectionUtils.newStringSet("B", "D");
logic.unstripKeys(builder, keyCheck, toIgnore);
assertEquals(2, ended.countEntries());
assertTrue(ended.contains("A"));
assertFalse(ended.contains("B"));
assertTrue(ended.contains("C"));
assertFalse(ended.contains("D"));
}