@Test
    public void testAssignRaw() {
                roundtripSerializeJsonAndMatch(inputJson(
                        "{",
                        "    'update': 'DOCUMENT_ID',",
                        "    'fields': {",
                        "        'raw_field': {",
                        "            'assign': 'RG9uJ3QgYmVsaWV2ZSBoaXMgbGllcw=='",
                        "        }",
                        "    }",
                        "}"
                ));
    }
Tests roundtrip serialization (JSON -> DocumentUpdate -> Buffer -> DocumentUpdate -> JSON) of document updates.

@author Vegard Sjonfjell
document/src/test/java/com/yahoo/document/json/DocumentUpdateJsonSerializerTest.java