content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.kafka.streams.kstream.internals.foreignkeyjoin;
  
  import org.apache.kafka.common.serialization.Serdes;
  import org.apache.kafka.common.utils.Bytes;
  
  import org.junit.jupiter.api.Test;
  
  import java.nio.ByteBuffer;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class CombinedKeySchemaTest {
  
      @Test
      public void nonNullPrimaryKeySerdeTest() {
          final CombinedKeySchema<String, Integer> cks = new CombinedKeySchema<>(
              () -> "fkTopic", Serdes.String(),
              () -> "pkTopic", Serdes.Integer()
          );
          final Integer primary = -999;
          final Bytes result = cks.toBytes("foreignKey", primary);
  
          final CombinedKey<String, Integer> deserializedKey = cks.fromBytes(result);
          assertEquals("foreignKey", deserializedKey.foreignKey());
          assertEquals(primary, deserializedKey.primaryKey());
      }
  
      @Test
      public void nullPrimaryKeySerdeTest() {
          final CombinedKeySchema<String, Integer> cks = new CombinedKeySchema<>(
              () -> "fkTopic", Serdes.String(),
              () -> "pkTopic", Serdes.Integer()
          );
          assertThrows(NullPointerException.class, () -> cks.toBytes("foreignKey", null));
      }
  
      @Test
      public void nullForeignKeySerdeTest() {
          final CombinedKeySchema<String, Integer> cks = new CombinedKeySchema<>(
              () -> "fkTopic", Serdes.String(),
              () -> "pkTopic", Serdes.Integer()
          );
          assertThrows(NullPointerException.class, () -> cks.toBytes(null, 10));
      }
  
      @Test
      public void prefixKeySerdeTest() {
          final CombinedKeySchema<String, Integer> cks = new CombinedKeySchema<>(
              () -> "fkTopic", Serdes.String(),
              () -> "pkTopic", Serdes.Integer()
          );
          final String foreignKey = "someForeignKey";
          final byte[] foreignKeySerializedData =
              Serdes.String().serializer().serialize("fkTopic", foreignKey);
          final Bytes prefix = cks.prefixBytes(foreignKey);
  
          final ByteBuffer buf = ByteBuffer.allocate(Integer.BYTES + foreignKeySerializedData.length);
          buf.putInt(foreignKeySerializedData.length);
          buf.put(foreignKeySerializedData);
          final Bytes expectedPrefixBytes = Bytes.wrap(buf.array());
  
          assertEquals(expectedPrefixBytes, prefix);
      }
  
      @Test
      public void nullPrefixKeySerdeTest() {
          final CombinedKeySchema<String, Integer> cks = new CombinedKeySchema<>(
              () -> "fkTopic", Serdes.String(),
              () -> "pkTopic", Serdes.Integer()
          );
          final String foreignKey = null;
          assertThrows(NullPointerException.class, () -> cks.prefixBytes(foreignKey));
      }
  }
  