/*
    * 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.commons.io.function;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.nio.file.Path;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Optional;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link IOUnaryOperator}.
   */
  public class IOUnaryOperatorTest {
  
      @Test
      public void testAsUnaryOperator() {
          final List<Path> list = Arrays.asList(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A);
          final IOUnaryOperator<Path> throwingIOUnaryOperator = TestUtils.throwingIOUnaryOperator();
          assertThrows(UncheckedIOException.class, () -> list.replaceAll(throwingIOUnaryOperator.asUnaryOperator()));
          assertEquals("a", Optional.of("a").map(IOUnaryOperator.identity().asUnaryOperator()).get());
          assertEquals("a", Optional.of("a").map(IOUnaryOperator.identity().asFunction()).get());
      }
  
      @Test
      public void testIdentity() throws IOException {
          assertEquals(IOUnaryOperator.identity(), IOUnaryOperator.identity());
          final IOUnaryOperator<byte[]> identityFunction = IOUnaryOperator.identity();
          final byte[] buf = {(byte) 0xa, (byte) 0xb, (byte) 0xc};
          assertEquals(buf, identityFunction.apply(buf));
          assertArrayEquals(buf, identityFunction.apply(buf));
      }
  
  }