@Test
    public void testMultipleOperationsOnSingleFieldPath() {
        roundtripSerializeJsonAndMatch(inputJson(
                "{",
                "   'update': 'DOCUMENT_ID',",
                "   'fields': {",
                "       'map_struct{my_key}': {",
                "           'assign': {",
                "               'my_string_field': 'Some string'",
                "           },",
                "           'remove': 0",
                "       }",
                "   }",
                "}"
        ));
    }
Tests roundtrip serialization (JSON -> DocumentUpdate -> Buffer -> DocumentUpdate -> JSON) of document updates.

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