content: /*
   * Copyright 2023 Aiven Oy
   *
   * Licensed 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 io.aiven.kafka.tieredstorage.transform;
  
  import com.github.luben.zstd.ZstdCompressCtx;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mock;
  import org.mockito.junit.jupiter.MockitoExtension;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  @ExtendWith(MockitoExtension.class)
  class DecompressionChunkEnumerationTest {
      @Mock
      DetransformChunkEnumeration inner;
  
      @Test
      void nullInnerEnumeration() {
          assertThatThrownBy(() -> new DecompressionChunkEnumeration(null))
              .isInstanceOf(NullPointerException.class)
              .hasMessage("inner cannot be null");
      }
  
      @Test
      void hasMoreElementsPropagated() {
          final var transform = new DecompressionChunkEnumeration(inner);
          when(inner.hasMoreElements())
              .thenReturn(true)
              .thenReturn(false);
          assertThat(transform.hasMoreElements()).isTrue();
          assertThat(transform.hasMoreElements()).isFalse();
          verify(inner, times(2)).hasMoreElements();
      }
  
      @Test
      void decompress() {
          final byte[] data = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
          final byte[] compressed;
          try (final ZstdCompressCtx compressCtx = new ZstdCompressCtx()) {
              compressCtx.setContentSize(true);
              compressed = compressCtx.compress(data);
          }
  
          final var transform = new DecompressionChunkEnumeration(inner);
          when(inner.nextElement()).thenReturn(compressed);
  
          assertThat(transform.nextElement()).isEqualTo(data);
      }
  }
  