@Test
public void nullSchemaAndMapNonStringKeysToJson() {

    // This still needs to do conversion of data, null schema means "anything goes". Make sure we mix and match
    // types to verify conversion still works.
    Map<Object, Object> input = new HashMap<>();
    input.put("string", 12);
    input.put(52, "string");
    input.put(false, true);
    JsonNode converted = parse(converter.fromConnectData(TOPIC, null, input));
    validateEnvelopeNullSchema(converted);
    assertTrue(converted.get(JsonSchema.ENVELOPE_SCHEMA_FIELD_NAME).isNull());
    assertTrue(converted.get(JsonSchema.ENVELOPE_PAYLOAD_FIELD_NAME).isArray());
    ArrayNode payload = (ArrayNode) converted.get(JsonSchema.ENVELOPE_PAYLOAD_FIELD_NAME);
    assertEquals(3, payload.size());
    Set<JsonNode> payloadEntries = new HashSet<>();
    for (JsonNode elem : payload)
        payloadEntries.add(elem);
    assertEquals(new HashSet<>(Arrays.asList(JsonNodeFactory.instance.arrayNode().add("string").add(12),
                    JsonNodeFactory.instance.arrayNode().add(52).add("string"),
                    JsonNodeFactory.instance.arrayNode().add(false).add(true))),
            payloadEntries
    );
}