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.cassandra.db.marshal;
  
  import java.nio.ByteBuffer;
  
  import org.junit.Test;
  
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.serializers.MarshalException;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.mockito.Mockito;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  
  public class EmptyTypeTest
  {
      @Test
      public void isFixed()
      {
          assertThat(EmptyType.instance.valueLengthIfFixed()).isEqualTo(0);
      }
  
      @Test
      public void writeEmptyAllowed()
      {
          DataOutputPlus output = Mockito.mock(DataOutputPlus.class);
          EmptyType.instance.writeValue(ByteBufferUtil.EMPTY_BYTE_BUFFER, output);
  
          Mockito.verifyNoInteractions(output);
      }
  
      @Test
      public void writeNonEmpty()
      {
          DataOutputPlus output = Mockito.mock(DataOutputPlus.class);
          ByteBuffer rejected = ByteBuffer.wrap("this better fail".getBytes());
  
          assertThatThrownBy(() -> EmptyType.instance.writeValue(rejected, output))
                    .isInstanceOf(AssertionError.class);
          Mockito.verifyNoInteractions(output);
      }
  
      @Test
      public void read()
      {
          DataInputPlus input = Mockito.mock(DataInputPlus.class);
  
          ByteBuffer buffer = EmptyType.instance.readBuffer(input);
          assertThat(buffer)
                    .isNotNull()
                    .matches(b -> !b.hasRemaining());
  
          buffer = EmptyType.instance.readBuffer(input, 42);
          assertThat(buffer)
                    .isNotNull()
                    .matches(b -> !b.hasRemaining());
  
          Mockito.verifyNoInteractions(input);
      }
  
      @Test
      public void decompose()
      {
          ByteBuffer buffer = EmptyType.instance.decompose(null);
          assertThat(buffer.remaining()).isEqualTo(0);
      }
  
      @Test
      public void composeEmptyInput()
      {
          Void result = EmptyType.instance.compose(ByteBufferUtil.EMPTY_BYTE_BUFFER);
          assertThat(result).isNull();
      }
  
      @Test
      public void composeNonEmptyInput()
      {
          assertThatThrownBy(() -> EmptyType.instance.compose(ByteBufferUtil.bytes("should fail")))
                    .isInstanceOf(MarshalException.class)
                    .hasMessage("EmptyType only accept empty values");
      }
  }
  