public void testUnknownEnumValues() throws Exception {
TestUnknownEnumValue.Builder builder = TestUnknownEnumValue.newBuilder();
builder.getMutableInt32ToInt32Field().put(1, 1);
builder.getMutableInt32ToInt32Field().put(2, 54321);
ByteString data = builder.build().toByteString();
TestMap message = TestMap.parseFrom(data);
// Entries with unknown enum values will be stored into UnknownFieldSet so
// there is only one entry in the map.
assertEquals(1, message.getInt32ToEnumField().size());
assertEquals(TestMap.EnumValue.BAR, message.getInt32ToEnumField().get(1));
// Serializing and parsing should preserve the unknown entry.
data = message.toByteString();
TestUnknownEnumValue messageWithUnknownEnums = TestUnknownEnumValue.parseFrom(data);
assertEquals(2, messageWithUnknownEnums.getInt32ToInt32Field().size());
assertEquals(1, messageWithUnknownEnums.getInt32ToInt32Field().get(1).intValue());
assertEquals(54321, messageWithUnknownEnums.getInt32ToInt32Field().get(2).intValue());
}
