code: /*
   * Copyright (c) 2022 Airbyte, Inc., all rights reserved.
   */
  
  package io.airbyte.db.jdbc.streaming;
  
  import static org.mockito.ArgumentMatchers.anyInt;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import joptsimple.internal.Strings;
  import org.junit.jupiter.api.Test;
  
  class AdaptiveStreamingQueryConfigTest {
  
    @Test
    void testFetchSizeUpdate() throws SQLException {
      final AdaptiveStreamingQueryConfig queryConfig = new AdaptiveStreamingQueryConfig();
      final ResultSet resultSet = mock(ResultSet.class);
      for (int i = 0; i < FetchSizeConstants.INITIAL_SAMPLE_SIZE - 1; ++i) {
        queryConfig.accept(resultSet, Strings.repeat(Character.forDigit(i, 10), i + 1));
        verify(resultSet, never()).setFetchSize(anyInt());
      }
      queryConfig.accept(resultSet, "final sampling in the initial stage");
      verify(resultSet, times(1)).setFetchSize(anyInt());
      queryConfig.accept(resultSet, "abcd");
    }
  
  }
  