new conversion tests added

kafka-ui-api/src/main/java/com/provectus/kafka/ui/util/jsonschema/JsonAvroConversion.java

@@ -189,11 +189,8 @@ public class JsonAvroConversion {
         yield node;
       }
       case MAP -> {
-        var map = (Map<Utf8, Object>) obj;
         ObjectNode node = MAPPER.createObjectNode();
-        map.forEach((k, v) -> {
-          node.set(k.toString(), convertAvroToJson(v, avroSchema.getValueType()));
-        });
+        ((Map) obj).forEach((k, v) -> node.set(k.toString(), convertAvroToJson(v, avroSchema.getValueType())));
         yield node;
       }
       case ARRAY -> {
@@ -206,8 +203,6 @@ public class JsonAvroConversion {
         yield new TextNode(obj.toString());
       }
       case UNION -> {
-        //TODO: cover with tests
-        // non-null case
         ObjectNode node = MAPPER.createObjectNode();
         int unionIdx = AvroData.getGenericData().resolveUnion(avroSchema, obj);
         Schema unionType = avroSchema.getTypes().get(unionIdx);
@@ -232,25 +227,17 @@ public class JsonAvroConversion {
         }
         yield new IntNode((Integer) obj);
       }
-      case FLOAT -> {
-        yield new FloatNode((Float) obj);
-      }
-      case DOUBLE -> {
-        yield new DoubleNode((Double) obj);
-      }
-      case BOOLEAN -> {
-        yield BooleanNode.valueOf((Boolean) obj);
-      }
-      case NULL -> {
-        yield NullNode.getInstance();
-      }
+      case FLOAT -> new FloatNode((Float) obj);
+      case DOUBLE -> new DoubleNode((Double) obj);
+      case BOOLEAN -> BooleanNode.valueOf((Boolean) obj);
+      case NULL -> NullNode.getInstance();
       case BYTES -> {
         if (isLogicalType(avroSchema)) {
           yield processLogicalType(obj, avroSchema);
         }
         //TODO: check with tests
-        byte[] bytes = (byte[]) obj;
-        yield new TextNode(new String(bytes)); //TODO: encoding
+        ByteBuffer bytes = (ByteBuffer) obj;
+        yield new TextNode(new String(bytes.array()));
       }
       case FIXED -> {
         if (isLogicalType(avroSchema)) {
@@ -263,27 +250,26 @@ public class JsonAvroConversion {
   }
 
   private static Object processLogicalType(JsonNode node, Schema schema) {
-    String logicalTypeName = schema.getLogicalType().getName();
-    var conversion = Stream.of(LogicalTypeConversion.values())
-        .filter(t -> t.name.equalsIgnoreCase(logicalTypeName))
-        .findFirst();
-    return conversion
+    return findConversion(schema)
         .map(c -> c.jsonToAvroConversion.apply(node, schema))
         .orElseThrow(() ->
             new JsonToAvroConversionException("'%s' logical type is not supported"
-                .formatted(logicalTypeName)));
+                .formatted(schema.getLogicalType().getName())));
   }
 
   private static JsonNode processLogicalType(Object obj, Schema schema) {
-    String logicalTypeName = schema.getLogicalType().getName();
-    var conversion = Stream.of(LogicalTypeConversion.values())
-        .filter(t -> t.name.equalsIgnoreCase(logicalTypeName))
-        .findFirst();
-    return conversion
+    return findConversion(schema)
         .map(c -> c.avroToJsonConversion.apply(obj, schema))
         .orElseThrow(() ->
             new JsonToAvroConversionException("'%s' logical type is not supported"
-                .formatted(logicalTypeName)));
+                .formatted(schema.getLogicalType().getName())));
+  }
+
+  private static Optional<LogicalTypeConversion> findConversion(Schema schema) {
+    String logicalTypeName = schema.getLogicalType().getName();
+    return Stream.of(LogicalTypeConversion.values())
+        .filter(t -> t.name.equalsIgnoreCase(logicalTypeName))
+        .findFirst();
   }
 
   private static boolean isLogicalType(Schema schema) {

kafka-ui-api/src/test/java/com/provectus/kafka/ui/serdes/builtin/sr/SchemaRegistrySerdeTest.java

@@ -6,8 +6,8 @@ import com.fasterxml.jackson.databind.json.JsonMapper;
 import com.provectus.kafka.ui.serde.api.DeserializeResult;
 import com.provectus.kafka.ui.serde.api.SchemaDescription;
 import com.provectus.kafka.ui.serde.api.Serde;
+import com.provectus.kafka.ui.util.jsonschema.JsonAvroConversion;
 import io.confluent.kafka.schemaregistry.avro.AvroSchema;
-import io.confluent.kafka.schemaregistry.avro.AvroSchemaUtils;
 import io.confluent.kafka.schemaregistry.client.MockSchemaRegistryClient;
 import io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException;
 import java.io.ByteArrayOutputStream;
@@ -212,13 +212,13 @@ class SchemaRegistrySerdeTest {
     GenericDatumWriter<Object> writer = new GenericDatumWriter<>(schema.rawSchema());
     ByteArrayOutputStream output = new ByteArrayOutputStream();
     Encoder encoder = EncoderFactory.get().binaryEncoder(output, null);
-    writer.write(AvroSchemaUtils.toObject(json, schema), encoder);
+    writer.write(JsonAvroConversion.convertJsonToAvro(json, schema.rawSchema()), encoder);
     encoder.flush();
     return output.toByteArray();
   }
 
   @Test
-  void fieldsRepresentationIsConsistentForSerializationAndDeserialization() throws Exception {
+  void avroFieldsRepresentationIsConsistentForSerializationAndDeserialization() throws Exception {
     AvroSchema schema = new AvroSchema(
         """
              {
@@ -268,6 +268,10 @@ class SchemaRegistrySerdeTest {
                  {
                   "name": "f_union",
                   "type": ["null", "string", "int" ]
+                 },
+                 {
+                  "name": "f_optional_to_test_not_filled_case",
+                  "type": [ "null", "string"]
                  }
                ]
             }"""
@@ -288,18 +292,11 @@ class SchemaRegistrySerdeTest {
         """;
 
     registryClient.register("test-value", schema);
-
-    byte[] serializedBytes = serde.serializer("test", Serde.Target.VALUE).serialize(jsonPayload);
-
-    var deserializedJson = serde.deserializer("test", Serde.Target.VALUE)
-        .deserialize(null, serializedBytes)
-        .getResult();
-
-    assertJsonsEqual(jsonPayload, deserializedJson);
+    assertSerdeCycle("test", jsonPayload);
   }
 
   @Test
-  void logicalTypesRepresentationIsConsistentForSerializationAndDeserialization() throws Exception {
+  void avroLogicalTypesRepresentationIsConsistentForSerializationAndDeserialization() throws Exception {
     AvroSchema schema = new AvroSchema(
         """
              {
@@ -361,14 +358,18 @@ class SchemaRegistrySerdeTest {
         """;
 
     registryClient.register("test-value", schema);
+    assertSerdeCycle("test", jsonPayload);
+  }
 
-    byte[] serializedBytes = serde.serializer("test", Serde.Target.VALUE).serialize(jsonPayload);
-
-    var deserializedJson = serde.deserializer("test", Serde.Target.VALUE)
+  // 1. serialize input json to binary
+  // 2. deserialize from binary
+  // 3. check that deserialized version equal to input
+  void assertSerdeCycle(String topic, String jsonInput) {
+    byte[] serializedBytes = serde.serializer(topic, Serde.Target.VALUE).serialize(jsonInput);
+    var deserializedJson = serde.deserializer(topic, Serde.Target.VALUE)
         .deserialize(null, serializedBytes)
         .getResult();
-
-    assertJsonsEqual(jsonPayload, deserializedJson);
+    assertJsonsEqual(jsonInput, deserializedJson);
   }
 
 }

kafka-ui-api/src/test/java/com/provectus/kafka/ui/util/jsonschema/JsonAvroConversionTest.java

@@ -1,8 +1,17 @@
 package com.provectus.kafka.ui.util.jsonschema;
 
 import static com.provectus.kafka.ui.util.jsonschema.JsonAvroConversion.convertJsonToAvro;
+import static com.provectus.kafka.ui.util.jsonschema.JsonAvroConversion.convertAvroToJson;
 import static org.assertj.core.api.Assertions.assertThat;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.json.JsonMapper;
+import com.fasterxml.jackson.databind.node.BooleanNode;
+import com.fasterxml.jackson.databind.node.DoubleNode;
+import com.fasterxml.jackson.databind.node.FloatNode;
+import com.fasterxml.jackson.databind.node.IntNode;
+import com.fasterxml.jackson.databind.node.LongNode;
+import com.fasterxml.jackson.databind.node.TextNode;
 import io.confluent.kafka.schemaregistry.avro.AvroSchema;
 import java.math.BigDecimal;
 import java.time.Instant;
@@ -11,355 +20,569 @@ import java.time.LocalDateTime;
 import java.time.LocalTime;
 import java.util.List;
 import java.util.Map;
+import java.util.UUID;
+import lombok.SneakyThrows;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
 class JsonAvroConversionTest {
 
-  @Test
-  void primitiveRoot() {
-    assertThat(convertJsonToAvro("\"str\"", createSchema("\"string\"")))
-        .isEqualTo("str");
-
-    assertThat(convertJsonToAvro("123", createSchema("\"int\"")))
-        .isEqualTo(123);
-
-    assertThat(convertJsonToAvro("123", createSchema("\"long\"")))
-        .isEqualTo(123L);
-
-    assertThat(convertJsonToAvro("123.123", createSchema("\"float\"")))
-        .isEqualTo(123.123F);
-
-    assertThat(convertJsonToAvro("12345.12345", createSchema("\"double\"")))
-        .isEqualTo(12345.12345);
-  }
-
-  @Test
-  void primitiveTypedFields() {
-    var schema = createSchema(
-        """
-             {
-               "type": "record",
-               "name": "TestAvroRecord",
-               "fields": [
-                 {
-                   "name": "f_int",
-                   "type": "int"
-                 },
-                 {
-                   "name": "f_long",
-                   "type": "long"
-                 },
-                 {
-                   "name": "f_string",
-                   "type": "string"
-                 },
-                 {
-                   "name": "f_boolean",
-                   "type": "boolean"
-                 },
-                 {
-                   "name": "f_float",
-                   "type": "float"
-                 },
-                 {
-                   "name": "f_double",
-                   "type": "double"
-                 },
-                 {
-                   "name": "f_enum",
-                   "type" : {
-                    "type": "enum",
-                    "name": "Suit",
-                    "symbols" : ["SPADES", "HEARTS", "DIAMONDS", "CLUBS"]
+  // checking conversion from json to KafkaAvroSerializer-compatible avro objects
+  @Nested
+  class FromJsonToAvro {
+
+    @Test
+    void primitiveRoot() {
+      assertThat(convertJsonToAvro("\"str\"", createSchema("\"string\"")))
+          .isEqualTo("str");
+
+      assertThat(convertJsonToAvro("123", createSchema("\"int\"")))
+          .isEqualTo(123);
+
+      assertThat(convertJsonToAvro("123", createSchema("\"long\"")))
+          .isEqualTo(123L);
+
+      assertThat(convertJsonToAvro("123.123", createSchema("\"float\"")))
+          .isEqualTo(123.123F);
+
+      assertThat(convertJsonToAvro("12345.12345", createSchema("\"double\"")))
+          .isEqualTo(12345.12345);
+    }
+
+    @Test
+    void primitiveTypedFields() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "f_int",
+                     "type": "int"
+                   },
+                   {
+                     "name": "f_long",
+                     "type": "long"
+                   },
+                   {
+                     "name": "f_string",
+                     "type": "string"
+                   },
+                   {
+                     "name": "f_boolean",
+                     "type": "boolean"
+                   },
+                   {
+                     "name": "f_float",
+                     "type": "float"
+                   },
+                   {
+                     "name": "f_double",
+                     "type": "double"
+                   },
+                   {
+                     "name": "f_enum",
+                     "type" : {
+                      "type": "enum",
+                      "name": "Suit",
+                      "symbols" : ["SPADES", "HEARTS", "DIAMONDS", "CLUBS"]
+                     }
                    }
-                 }
-               ]
-            }"""
-    );
-
-    String jsonPayload = """
-        {
-          "f_int": 123,
-          "f_long": 4294967294,
-          "f_string": "string here",
-          "f_boolean": true,
-          "f_float": 123.1,
-          "f_double": 123456.123456,
-          "f_enum": "SPADES"
-        }
-        """;
-
-    var converted = convertJsonToAvro(jsonPayload, schema);
-    assertThat(converted).isInstanceOf(GenericData.Record.class);
-
-    var record = (GenericData.Record) converted;
-    assertThat(record.get("f_int")).isEqualTo(123);
-    assertThat(record.get("f_long")).isEqualTo(4294967294L);
-    assertThat(record.get("f_string")).isEqualTo("string here");
-    assertThat(record.get("f_boolean")).isEqualTo(true);
-    assertThat(record.get("f_float")).isEqualTo(123.1f);
-    assertThat(record.get("f_double")).isEqualTo(123456.123456);
-    assertThat(record.get("f_enum"))
-        .isEqualTo(
-            new GenericData.EnumSymbol(
-                schema.getField("f_enum").schema(),
-                "SPADES"
-            )
-        );
-  }
-
-  @Test
-  void unionRoot() {
-    var sc = createSchema("[ \"null\", \"string\", \"int\" ]");
-
-    var converted = convertJsonToAvro("{\"string\":\"string here\"}", sc);
-    assertThat(converted).isEqualTo("string here");
-
-    converted = convertJsonToAvro("{\"int\": 123}", sc);
-    assertThat(converted).isEqualTo(123);
-
-    converted = convertJsonToAvro("null", sc);
-    assertThat(converted).isEqualTo(null);
-  }
+                 ]
+              }"""
+      );
+
+      String jsonPayload = """
+          {
+            "f_int": 123,
+            "f_long": 4294967294,
+            "f_string": "string here",
+            "f_boolean": true,
+            "f_float": 123.1,
+            "f_double": 123456.123456,
+            "f_enum": "SPADES"
+          }
+          """;
+
+      var converted = convertJsonToAvro(jsonPayload, schema);
+      assertThat(converted).isInstanceOf(GenericData.Record.class);
+
+      var record = (GenericData.Record) converted;
+      assertThat(record.get("f_int")).isEqualTo(123);
+      assertThat(record.get("f_long")).isEqualTo(4294967294L);
+      assertThat(record.get("f_string")).isEqualTo("string here");
+      assertThat(record.get("f_boolean")).isEqualTo(true);
+      assertThat(record.get("f_float")).isEqualTo(123.1f);
+      assertThat(record.get("f_double")).isEqualTo(123456.123456);
+      assertThat(record.get("f_enum"))
+          .isEqualTo(
+              new GenericData.EnumSymbol(
+                  schema.getField("f_enum").schema(),
+                  "SPADES"
+              )
+          );
+    }
+
+    @Test
+    void unionRoot() {
+      var schema = createSchema("[ \"null\", \"string\", \"int\" ]");
+
+      var converted = convertJsonToAvro("{\"string\":\"string here\"}", schema);
+      assertThat(converted).isEqualTo("string here");
+
+      converted = convertJsonToAvro("{\"int\": 123}", schema);
+      assertThat(converted).isEqualTo(123);
+
+      converted = convertJsonToAvro("null", schema);
+      assertThat(converted).isEqualTo(null);
+    }
+
+    @Test
+    void unionField() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "namespace": "com.test",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "f_union",
+                     "type": [ "null", "int", "TestAvroRecord"]
+                   }
+                 ]
+              }"""
+      );
+
+      String jsonPayload = "{ \"f_union\": null }";
+
+      var record = (GenericData.Record) convertJsonToAvro(jsonPayload, schema);
+      assertThat(record.get("f_union")).isNull();
+
+      jsonPayload = "{ \"f_union\": { \"int\": 123 } }";
+      record = (GenericData.Record) convertJsonToAvro(jsonPayload, schema);
+      assertThat(record.get("f_union")).isEqualTo(123);
+
+      //inner-record's name should be fully-qualified!
+      jsonPayload = "{ \"f_union\": { \"com.test.TestAvroRecord\": { \"f_union\": { \"int\": 123  } } } }";
+      record = (GenericData.Record) convertJsonToAvro(jsonPayload, schema);
+      assertThat(record.get("f_union")).isInstanceOf(GenericData.Record.class);
+      var innerRec = (GenericData.Record) record.get("f_union");
+      assertThat(innerRec.get("f_union")).isEqualTo(123);
+    }
+
+    @Test
+    void mapField() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "long_map",
+                     "type": {
+                       "type": "map",
+                       "values" : "long",
+                       "default": {}
+                     }
+                   },
+                   {
+                     "name": "string_map",
+                     "type": {
+                       "type": "map",
+                       "values" : "string",
+                       "default": {}
+                     }
+                   },
+                   {
+                     "name": "self_ref_map",
+                     "type": {
+                       "type": "map",
+                       "values" : "TestAvroRecord",
+                       "default": {}
+                     }
+                   }
+                 ]
+              }"""
+      );
+
+      String jsonPayload = """
+          {
+            "long_map": {
+              "k1": 123,
+              "k2": 456
+            },
+            "string_map": {
+              "k3": "s1",
+              "k4": "s2"
+            },
+            "self_ref_map": {
+              "k5" : {
+                "long_map": { "_k1": 222 },
+                "string_map": { "_k2": "_s1" }
+              }
+            }
+          }
+          """;
+
+      var record = (GenericData.Record) convertJsonToAvro(jsonPayload, schema);
+      assertThat(record.get("long_map"))
+          .isEqualTo(Map.of("k1", 123L, "k2", 456L));
+      assertThat(record.get("string_map"))
+          .isEqualTo(Map.of("k3", "s1", "k4", "s2"));
+      assertThat(record.get("self_ref_map"))
+          .isNotNull();
+
+      Map<String, Object> selfRefMapField = (Map<String, Object>) record.get("self_ref_map");
+      assertThat(selfRefMapField)
+          .hasSize(1)
+          .hasEntrySatisfying("k5", v -> {
+            assertThat(v).isInstanceOf(GenericData.Record.class);
+            var innerRec = (GenericData.Record) v;
+            assertThat(innerRec.get("long_map"))
+                .isEqualTo(Map.of("_k1", 222L));
+            assertThat(innerRec.get("string_map"))
+                .isEqualTo(Map.of("_k2", "_s1"));
+          });
+    }
+
+    @Test
+    void arrayField() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "f_array",
+                     "type": {
+                        "type": "array",
+                        "items" : "string",
+                        "default": []
+                      }
+                   }
+                 ]
+              }"""
+      );
 
-  @Test
-  void unionField() {
-    var schema = createSchema(
-        """
-             {
-               "type": "record",
-               "name": "TestAvroRecord",
-               "fields": [
-                 {
-                   "name": "f_union",
-                   "type": [ "null", "int", "TestAvroRecord"]
-                 }
-               ]
-            }"""
-    );
-
-    String jsonPayload = "{ \"f_union\": null }";
-
-    var converted = convertJsonToAvro(jsonPayload, schema);
-    assertThat(converted).isInstanceOf(GenericData.Record.class);
-
-    var record = (GenericData.Record) converted;
-    assertThat(record.get("f_union")).isNull();
-
-
-    jsonPayload = "{ \"f_union\": { \"int\": 123 } }";
-    record = (GenericData.Record) convertJsonToAvro(jsonPayload, schema);
-    assertThat(record.get("f_union")).isEqualTo(123);
-
-    jsonPayload = "{ \"f_union\": { \"TestAvroRecord\": { \"f_union\": { \"int\": 123  } } } }";
-    record = (GenericData.Record) convertJsonToAvro(jsonPayload, schema);
-
-    assertThat(record.get("f_union")).isInstanceOf(GenericData.Record.class);
-    var innerRec = (GenericData.Record) record.get("f_union");
-    assertThat(innerRec.get("f_union")).isEqualTo(123);
+      String jsonPayload = """
+          {
+            "f_array": [ "e1", "e2" ]
+          }
+          """;
+
+      var record = (GenericData.Record) convertJsonToAvro(jsonPayload, schema);
+      assertThat(record.get("f_array")).isEqualTo(List.of("e1", "e2"));
+    }
+
+    @Test
+    void logicalTypesField() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "lt_date",
+                     "type": { "type": "int", "logicalType": "date" }
+                   },
+                   {
+                     "name": "lt_uuid",
+                     "type": { "type": "string", "logicalType": "uuid" }
+                   },
+                   {
+                     "name": "lt_decimal",
+                     "type": { "type": "bytes", "logicalType": "decimal", "precision": 22, "scale":10 }
+                   },
+                   {
+                     "name": "lt_time_millis",
+                     "type": { "type": "int", "logicalType": "time-millis"}
+                   },
+                   {
+                     "name": "lt_time_micros",
+                     "type": { "type": "long", "logicalType": "time-micros"}
+                   },
+                   {
+                     "name": "lt_timestamp_millis",
+                     "type": { "type": "long", "logicalType": "timestamp-millis" }
+                   },
+                   {
+                     "name": "lt_timestamp_micros",
+                     "type": { "type": "long", "logicalType": "timestamp-micros" }
+                   },
+                   {
+                     "name": "lt_local_timestamp_millis",
+                     "type": { "type": "long", "logicalType": "local-timestamp-millis" }
+                   },
+                   {
+                     "name": "lt_local_timestamp_micros",
+                     "type": { "type": "long", "logicalType": "local-timestamp-micros" }
+                   }
+                 ]
+              }"""
+      );
+
+      String jsonPayload = """
+          {
+            "lt_date":"1991-08-14",
+            "lt_decimal": 2.1617413862327545E11,
+            "lt_time_millis": "10:15:30.001",
+            "lt_time_micros": "10:15:30.123456",
+            "lt_uuid": "a37b75ca-097c-5d46-6119-f0637922e908",
+            "lt_timestamp_millis": "2007-12-03T10:15:30.123Z",
+            "lt_timestamp_micros": "2007-12-13T10:15:30.123456Z",
+            "lt_local_timestamp_millis": "2017-12-03T10:15:30.123",
+            "lt_local_timestamp_micros": "2017-12-13T10:15:30.123456"
+          }
+          """;
+
+      var converted = convertJsonToAvro(jsonPayload, schema);
+      assertThat(converted).isInstanceOf(GenericData.Record.class);
+
+      var record = (GenericData.Record) converted;
+
+      assertThat(record.get("lt_date"))
+          .isEqualTo(LocalDate.of(1991, 8, 14));
+      assertThat(record.get("lt_decimal"))
+          .isEqualTo(new BigDecimal("2.1617413862327545E11"));
+      assertThat(record.get("lt_time_millis"))
+          .isEqualTo(LocalTime.parse("10:15:30.001"));
+      assertThat(record.get("lt_time_micros"))
+          .isEqualTo(LocalTime.parse("10:15:30.123456"));
+      assertThat(record.get("lt_timestamp_millis"))
+          .isEqualTo(Instant.parse("2007-12-03T10:15:30.123Z"));
+      assertThat(record.get("lt_timestamp_micros"))
+          .isEqualTo(Instant.parse("2007-12-13T10:15:30.123456Z"));
+      assertThat(record.get("lt_local_timestamp_millis"))
+          .isEqualTo(LocalDateTime.parse("2017-12-03T10:15:30.123"));
+      assertThat(record.get("lt_local_timestamp_micros"))
+          .isEqualTo(LocalDateTime.parse("2017-12-13T10:15:30.123456"));
+    }
   }
 
-  @Test
-  void mapField() {
-    var schema = createSchema(
-        """
-             {
-               "type": "record",
-               "name": "TestAvroRecord",
-               "fields": [
-                 {
-                   "name": "long_map",
-                   "type": {
-                     "type": "map",
-                     "values" : "long",
-                     "default": {}
-                   }
-                 },
-                 {
-                   "name": "string_map",
-                   "type": {
-                     "type": "map",
-                     "values" : "string",
-                     "default": {}
+  // checking conversion of KafkaAvroDeserializer output to JsonNode
+  @Nested
+  class FromAvroToJson {
+
+    @Test
+    void primitiveRoot() {
+      assertThat(convertAvroToJson("str", createSchema("\"string\"")))
+          .isEqualTo(new TextNode("str"));
+
+      assertThat(convertAvroToJson(123, createSchema("\"int\"")))
+          .isEqualTo(new IntNode(123));
+
+      assertThat(convertAvroToJson(123L, createSchema("\"long\"")))
+          .isEqualTo(new LongNode(123));
+
+      assertThat(convertAvroToJson(123.1F, createSchema("\"float\"")))
+          .isEqualTo(new FloatNode(123.1F));
+
+      assertThat(convertAvroToJson(123.1, createSchema("\"double\"")))
+          .isEqualTo(new DoubleNode(123.1));
+
+      assertThat(convertAvroToJson(true, createSchema("\"boolean\"")))
+          .isEqualTo(BooleanNode.valueOf(true));
+    }
+
+    @SneakyThrows
+    @Test
+    void primitiveTypedFields() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "f_int",
+                     "type": "int"
+                   },
+                   {
+                     "name": "f_long",
+                     "type": "long"
+                   },
+                   {
+                     "name": "f_string",
+                     "type": "string"
+                   },
+                   {
+                     "name": "f_boolean",
+                     "type": "boolean"
+                   },
+                   {
+                     "name": "f_float",
+                     "type": "float"
+                   },
+                   {
+                     "name": "f_double",
+                     "type": "double"
+                   },
+                   {
+                     "name": "f_enum",
+                     "type" : {
+                      "type": "enum",
+                      "name": "Suit",
+                      "symbols" : ["SPADES", "HEARTS", "DIAMONDS", "CLUBS"]
+                     }
                    }
-                 },
-                 {
-                   "name": "self_ref_map",
-                   "type": {
-                     "type": "map",
-                     "values" : "TestAvroRecord",
-                     "default": {}
+                 ]
+              }"""
+      );
+
+      GenericData.Record inputRecord = new GenericData.Record(schema);
+      inputRecord.put("f_int", 123);
+      inputRecord.put("f_long", 4294967294L);
+      inputRecord.put("f_string", "string here");
+      inputRecord.put("f_boolean", true);
+      inputRecord.put("f_float", 123.1f);
+      inputRecord.put("f_double", 123456.123456);
+      inputRecord.put("f_enum", new GenericData.EnumSymbol(schema.getField("f_enum").schema(), "SPADES"));
+
+      String expectedJson = """
+          {
+            "f_int": 123,
+            "f_long": 4294967294,
+            "f_string": "string here",
+            "f_boolean": true,
+            "f_float": 123.1,
+            "f_double": 123456.123456,
+            "f_enum": "SPADES"
+          }
+          """;
+
+      assertJsonsEqual(expectedJson, convertAvroToJson(inputRecord, schema));
+    }
+
+    @Test
+    void logicalTypesField() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "lt_date",
+                     "type": { "type": "int", "logicalType": "date" }
+                   },
+                   {
+                     "name": "lt_uuid",
+                     "type": { "type": "string", "logicalType": "uuid" }
+                   },
+                   {
+                     "name": "lt_decimal",
+                     "type": { "type": "bytes", "logicalType": "decimal", "precision": 22, "scale":10 }
+                   },
+                   {
+                     "name": "lt_time_millis",
+                     "type": { "type": "int", "logicalType": "time-millis"}
+                   },
+                   {
+                     "name": "lt_time_micros",
+                     "type": { "type": "long", "logicalType": "time-micros"}
+                   },
+                   {
+                     "name": "lt_timestamp_millis",
+                     "type": { "type": "long", "logicalType": "timestamp-millis" }
+                   },
+                   {
+                     "name": "lt_timestamp_micros",
+                     "type": { "type": "long", "logicalType": "timestamp-micros" }
+                   },
+                   {
+                     "name": "lt_local_timestamp_millis",
+                     "type": { "type": "long", "logicalType": "local-timestamp-millis" }
+                   },
+                   {
+                     "name": "lt_local_timestamp_micros",
+                     "type": { "type": "long", "logicalType": "local-timestamp-micros" }
                    }
-                 }
-               ]
-            }"""
-    );
-
-    String jsonPayload = """
-        {
-          "long_map": {
-            "k1": 123,
-            "k2": 456
-          },
-          "string_map": {
-            "k3": "s1",
-            "k4": "s2"
-          },
-          "self_ref_map": {
-            "k5" : {
-              "long_map": { "_k1": 222 },
-              "string_map": { "_k2": "_s1" }
-            }
+                 ]
+              }"""
+      );
+
+      GenericData.Record inputRecord = new GenericData.Record(schema);
+      inputRecord.put("lt_date", LocalDate.of(1991, 8, 14));
+      inputRecord.put("lt_decimal", new BigDecimal("2.1617413862327545E11"));
+      inputRecord.put("lt_time_millis", LocalTime.parse("10:15:30.001"));
+      inputRecord.put("lt_time_micros", LocalTime.parse("10:15:30.123456"));
+      inputRecord.put("lt_uuid", UUID.fromString("a37b75ca-097c-5d46-6119-f0637922e908"));
+      inputRecord.put("lt_timestamp_millis", Instant.parse("2007-12-03T10:15:30.123Z"));
+      inputRecord.put("lt_timestamp_micros", Instant.parse("2007-12-13T10:15:30.123456Z"));
+      inputRecord.put("lt_local_timestamp_millis", LocalDateTime.parse("2017-12-03T10:15:30.123"));
+      inputRecord.put("lt_local_timestamp_micros", LocalDateTime.parse("2017-12-13T10:15:30.123456"));
+
+      String expectedJson = """
+          {
+            "lt_date":"1991-08-14",
+            "lt_decimal": 2.1617413862327545E11,
+            "lt_time_millis": "10:15:30.001",
+            "lt_time_micros": "10:15:30.123456",
+            "lt_uuid": "a37b75ca-097c-5d46-6119-f0637922e908",
+            "lt_timestamp_millis": "2007-12-03T10:15:30.123Z",
+            "lt_timestamp_micros": "2007-12-13T10:15:30.123456Z",
+            "lt_local_timestamp_millis": "2017-12-03T10:15:30.123",
+            "lt_local_timestamp_micros": "2017-12-13T10:15:30.123456"
           }
-        }
-        """;
-
-    var converted = convertJsonToAvro(jsonPayload, schema);
-    assertThat(converted).isInstanceOf(GenericData.Record.class);
-
-    var record = (GenericData.Record) converted;
-    assertThat(record.get("long_map"))
-        .isEqualTo(Map.of("k1", 123L, "k2", 456L));
-    assertThat(record.get("string_map"))
-        .isEqualTo(Map.of("k3", "s1", "k4", "s2"));
-    assertThat(record.get("self_ref_map"))
-        .isNotNull();
-
-    Map<String, Object> selfRefMapField = (Map<String, Object>) record.get("self_ref_map");
-    assertThat(selfRefMapField)
-        .hasSize(1)
-        .hasEntrySatisfying("k5", v -> {
-          assertThat(v).isInstanceOf(GenericData.Record.class);
-          var innerRec = (GenericData.Record) v;
-          assertThat(innerRec.get("long_map"))
-              .isEqualTo(Map.of("_k1", 222L));
-          assertThat(innerRec.get("string_map"))
-              .isEqualTo(Map.of("_k2", "_s1"));
-        });
-  }
+          """;
+
+      assertJsonsEqual(expectedJson, convertAvroToJson(inputRecord, schema));
+    }
+
+    @Test
+    void unionField() {
+      var schema = createSchema(
+          """
+               {
+                 "type": "record",
+                 "namespace": "com.test",
+                 "name": "TestAvroRecord",
+                 "fields": [
+                   {
+                     "name": "f_union",
+                     "type": [ "null", "int", "TestAvroRecord"]
+                   }
+                 ]
+              }"""
+      );
 
-  @Test
-  void arrayField() {
-    var schema = createSchema(
-        """
-             {
-               "type": "record",
-               "name": "TestAvroRecord",
-               "fields": [
-                 {
-                   "name": "f_array",
-                   "type": {
-                      "type": "array",
-                      "items" : "string",
-                      "default": []
-                    }
-                 }
-               ]
-            }"""
-    );
-
-    String jsonPayload = """
-        {
-          "f_array": [ "e1", "e2" ]
-        }
-        """;
-
-    var converted = convertJsonToAvro(jsonPayload, schema);
-    assertThat(converted).isInstanceOf(GenericData.Record.class);
-
-    var record = (GenericData.Record) converted;
-    assertThat(record.get("f_array")).isEqualTo(List.of("e1", "e2"));
-  }
+      var r = new GenericData.Record(schema);
+      r.put("f_union", null);
+      assertJsonsEqual(" {}", convertAvroToJson(r, schema));
+
+      r = new GenericData.Record(schema);
+      r.put("f_union", 123);
+      assertJsonsEqual(" { \"f_union\" : { \"int\" : 123 } }", convertAvroToJson(r, schema));
+
+
+      r = new GenericData.Record(schema);
+      var innerRec = new GenericData.Record(schema);
+      innerRec.put("f_union", 123);
+      r.put("f_union", innerRec);
+      assertJsonsEqual(
+          " { \"f_union\" : { \"com.test.TestAvroRecord\" : { \"f_union\" : { \"int\" : 123 } } } }",
+          convertAvroToJson(r, schema)
+      );
+    }
 
-  @Test
-  void logicalTypesField() {
-    var schema = createSchema(
-        """
-             {
-               "type": "record",
-               "name": "TestAvroRecord",
-               "fields": [
-                 {
-                   "name": "lt_date",
-                   "type": { "type": "int", "logicalType": "date" }
-                 },
-                 {
-                   "name": "lt_uuid",
-                   "type": { "type": "string", "logicalType": "uuid" }
-                 },
-                 {
-                   "name": "lt_decimal",
-                   "type": { "type": "bytes", "logicalType": "decimal", "precision": 22, "scale":10 }
-                 },
-                 {
-                   "name": "lt_time_millis",
-                   "type": { "type": "int", "logicalType": "time-millis"}
-                 },
-                 {
-                   "name": "lt_time_micros",
-                   "type": { "type": "long", "logicalType": "time-micros"}
-                 },
-                 {
-                   "name": "lt_timestamp_millis",
-                   "type": { "type": "long", "logicalType": "timestamp-millis" }
-                 },
-                 {
-                   "name": "lt_timestamp_micros",
-                   "type": { "type": "long", "logicalType": "timestamp-micros" }
-                 },
-                 {
-                   "name": "lt_local_timestamp_millis",
-                   "type": { "type": "long", "logicalType": "local-timestamp-millis" }
-                 },
-                 {
-                   "name": "lt_local_timestamp_micros",
-                   "type": { "type": "long", "logicalType": "local-timestamp-micros" }
-                 }
-               ]
-            }"""
-    );
-
-    String jsonPayload = """
-        {
-          "lt_date":"1991-08-14",
-          "lt_decimal": 2.1617413862327545E11,
-          "lt_time_millis": "10:15:30.001",
-          "lt_time_micros": "10:15:30.123456",
-          "lt_uuid": "a37b75ca-097c-5d46-6119-f0637922e908",
-          "lt_timestamp_millis": "2007-12-03T10:15:30.123Z",
-          "lt_timestamp_micros": "2007-12-13T10:15:30.123456Z",
-          "lt_local_timestamp_millis": "2017-12-03T10:15:30.123",
-          "lt_local_timestamp_micros": "2017-12-13T10:15:30.123456"
-        }
-        """;
-
-    var converted = convertJsonToAvro(jsonPayload, schema);
-    assertThat(converted).isInstanceOf(GenericData.Record.class);
-
-    var record = (GenericData.Record) converted;
-
-    assertThat(record.get("lt_date"))
-        .isEqualTo(LocalDate.of(1991, 8, 14));
-    assertThat(record.get("lt_decimal"))
-        .isEqualTo(new BigDecimal("2.1617413862327545E11"));
-    assertThat(record.get("lt_time_millis"))
-        .isEqualTo(LocalTime.parse("10:15:30.001"));
-    assertThat(record.get("lt_time_micros"))
-        .isEqualTo(LocalTime.parse("10:15:30.123456"));
-    assertThat(record.get("lt_timestamp_millis"))
-        .isEqualTo(Instant.parse("2007-12-03T10:15:30.123Z"));
-    assertThat(record.get("lt_timestamp_micros"))
-        .isEqualTo(Instant.parse("2007-12-13T10:15:30.123456Z"));
-    assertThat(record.get("lt_local_timestamp_millis"))
-        .isEqualTo(LocalDateTime.parse("2017-12-03T10:15:30.123"));
-    assertThat(record.get("lt_local_timestamp_micros"))
-        .isEqualTo(LocalDateTime.parse("2017-12-13T10:15:30.123456"));
   }
 
   private Schema createSchema(String schema) {
     return new AvroSchema(schema).rawSchema();
   }
 
+  @SneakyThrows
+  private void assertJsonsEqual(String expected, JsonNode actual) {
+    var mapper = new JsonMapper();
+    assertThat(actual.toPrettyString())
+        .isEqualTo(mapper.readTree(expected).toPrettyString());
+  }
+
 }