code: /*
   * Copyright (c) 2022 Airbyte, Inc., all rights reserved.
   */
  
  package io.airbyte.integrations.destination.s3.jsonl;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import io.airbyte.commons.json.Jsons;
  import io.airbyte.integrations.base.AirbyteStreamNameNamespacePair;
  import io.airbyte.integrations.destination.record_buffer.BufferStorage;
  import io.airbyte.integrations.destination.record_buffer.FileBuffer;
  import io.airbyte.integrations.destination.record_buffer.InMemoryBuffer;
  import io.airbyte.protocol.models.AirbyteRecordMessage;
  import io.airbyte.protocol.models.CatalogHelpers;
  import io.airbyte.protocol.models.ConfiguredAirbyteCatalog;
  import io.airbyte.protocol.models.Field;
  import io.airbyte.protocol.models.JsonSchemaType;
  import java.io.File;
  import java.io.InputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.List;
  import java.util.Map;
  import java.util.zip.GZIPInputStream;
  import org.junit.jupiter.api.Test;
  
  public class JsonLSerializedBufferTest {
  
    private static final JsonNode MESSAGE_DATA = Jsons.jsonNode(Map.of(
        "field1", 10000,
        "column2", "string value",
        "another field", true,
        "nested_column", Map.of("array_column", List.of(1, 2, 3))));
    private static final String STREAM = "stream1";
    private static final AirbyteStreamNameNamespacePair streamPair = new AirbyteStreamNameNamespacePair(STREAM, null);
    private static final AirbyteRecordMessage message = new AirbyteRecordMessage()
        .withStream(STREAM)
        .withData(MESSAGE_DATA)
        .withEmittedAt(System.currentTimeMillis());
    protected static final List<Field> FIELDS = List.of(
        Field.of("field1", JsonSchemaType.NUMBER),
        Field.of("column2", JsonSchemaType.STRING),
        Field.of("another field", JsonSchemaType.BOOLEAN),
        Field.of("nested_column", JsonSchemaType.OBJECT));
    private static final ConfiguredAirbyteCatalog catalog = CatalogHelpers.createConfiguredAirbyteCatalog(STREAM, null, FIELDS);
    private static final String JSON_FILE_EXTENSION = ".jsonl";
  
    @Test
    public void testUncompressedJsonLFormatWriter() throws Exception {
      runTest(new InMemoryBuffer(JSON_FILE_EXTENSION), false, 425L, 435L, getExpectedString());
    }
  
    @Test
    public void testCompressedJsonLWriter() throws Exception {
      runTest(new FileBuffer(JSON_FILE_EXTENSION), true, 205L, 215L, getExpectedString());
    }
  
    private static String getExpectedString() {
      return Jsons.serialize(MESSAGE_DATA);
    }
  
    private static void runTest(final BufferStorage buffer,
                                final boolean withCompression,
                                final Long minExpectedByte,
                                final Long maxExpectedByte,
                                final String expectedData)
        throws Exception {
      final File outputFile = buffer.getFile();
      try (final JsonLSerializedBuffer writer = (JsonLSerializedBuffer) JsonLSerializedBuffer
          .createFunction(null, () -> buffer)
          .apply(streamPair, catalog)) {
        writer.withCompression(withCompression);
        writer.accept(message);
        writer.accept(message);
        writer.flush();
        // some data are randomized (uuid, timestamp, compression?) so the expected byte count is not always
        // deterministic
        assertTrue(minExpectedByte <= writer.getByteCount() && writer.getByteCount() <= maxExpectedByte,
            String.format("Expected size between %d and %d, but actual size was %d",
                minExpectedByte, maxExpectedByte, writer.getByteCount()));
        final InputStream inputStream;
        if (withCompression) {
          inputStream = new GZIPInputStream(writer.getInputStream());
        } else {
          inputStream = writer.getInputStream();
        }
        final JsonNode actualData = Jsons.deserialize(new String(inputStream.readAllBytes(), StandardCharsets.UTF_8));
        assertEquals(expectedData, Jsons.serialize(actualData.get("_airbyte_data")));
      }
      assertFalse(outputFile.exists());
    }
  
  }
  