/*
    * 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.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link IOComparator}.
   */
  public class IOComparatorTest {
  
      /** {@link Files#size(Path)} throws IOException */
      static final IOComparator<Path> PATH_SIZE_COMP = (final Path t, final Path u) -> Long.compare(Files.size(t), Files.size(u));
  
      /** {@link Path#toRealPath(java.nio.file.LinkOption...)} throws IOException */
      static final IOComparator<Path> REAL_PATH_COMP = (final Path t, final Path u) -> t.toRealPath().compareTo(u);
  
      @Test
      public void testAsComparator() {
          assertEquals(0, REAL_PATH_COMP.asComparator().compare(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A));
          assertThrows(UncheckedIOException.class,
              () -> TestConstants.THROWING_IO_COMPARATOR.asComparator().compare(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B));
      }
  
      @Test
      public void testCompareLong() throws IOException {
          assertEquals(0, REAL_PATH_COMP.compare(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A));
      }
  
      @Test
      public void testComparePath() throws IOException {
          assertEquals(0, PATH_SIZE_COMP.compare(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_A));
      }
  
      @Test
      public void testThrowing() {
          assertThrows(IOException.class, () -> TestConstants.THROWING_IO_COMPARATOR.compare(TestConstants.ABS_PATH_A, TestConstants.ABS_PATH_B));
      }
  
  }