@Test
public void mapToJsonNonStringKeys() {

    Schema intIntMap = SchemaBuilder.map(Schema.INT32_SCHEMA, Schema.INT32_SCHEMA).build();
    Map<Integer, Integer> input = new HashMap<>();
    input.put(1, 12);
    input.put(2, 15);
    JsonNode converted = parse(converter.fromConnectData(TOPIC, intIntMap, input));
    validateEnvelope(converted);
    assertEquals(parse("{ \"type\": \"map\", \"keys\": { \"type\" : \"int32\", \"optional\": false }, \"values\": { \"type\" : \"int32\", \"optional\": false }, \"optional\": false }"),
            converted.get(JsonSchema.ENVELOPE_SCHEMA_FIELD_NAME));
    assertTrue(converted.get(JsonSchema.ENVELOPE_PAYLOAD_FIELD_NAME).isArray());
    ArrayNode payload = (ArrayNode) converted.get(JsonSchema.ENVELOPE_PAYLOAD_FIELD_NAME);
    assertEquals(2, payload.size());
    Set<JsonNode> payloadEntries = new HashSet<>();
    for (JsonNode elem : payload)
        payloadEntries.add(elem);
    assertEquals(new HashSet<>(Arrays.asList(JsonNodeFactory.instance.arrayNode().add(1).add(12),
                    JsonNodeFactory.instance.arrayNode().add(2).add(15))),
            payloadEntries
    );
}