code: /*
   * Copyright (c) 2022 Airbyte, Inc., all rights reserved.
   */
  
  package io.airbyte.integrations.debezium;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import io.airbyte.commons.io.IOs;
  import io.airbyte.commons.json.Jsons;
  import io.airbyte.commons.resources.MoreResources;
  import io.airbyte.integrations.debezium.internals.AirbyteFileOffsetBackingStore;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.Map;
  import org.junit.jupiter.api.Test;
  
  class AirbyteFileOffsetBackingStoreTest {
  
    @SuppressWarnings("UnstableApiUsage")
    @Test
    void test() throws IOException {
      final Path testRoot = Files.createTempDirectory(Path.of("/tmp"), "offset-store-test");
  
      final byte[] bytes = MoreResources.readBytes("test_debezium_offset.dat");
      final Path templateFilePath = testRoot.resolve("template_offset.dat");
      IOs.writeFile(templateFilePath, bytes);
  
      final Path writeFilePath = testRoot.resolve("offset.dat");
  
      final AirbyteFileOffsetBackingStore offsetStore = new AirbyteFileOffsetBackingStore(templateFilePath);
      final Map<String, String> offset = offsetStore.read();
  
      final JsonNode asJson = Jsons.jsonNode(offset);
  
      final AirbyteFileOffsetBackingStore offsetStore2 = new AirbyteFileOffsetBackingStore(writeFilePath);
      offsetStore2.persist(asJson);
  
      final Map<String, String> stateFromOffsetStoreRoundTrip = offsetStore2.read();
  
      // verify that, after a round trip through the offset store, we get back the same data.
      assertEquals(offset, stateFromOffsetStoreRoundTrip);
      // verify that the file written by the offset store is identical to the template file.
      assertTrue(com.google.common.io.Files.equal(templateFilePath.toFile(), writeFilePath.toFile()));
    }
  
  }
  