/*
    * 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.output;
  
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link ClosedOutputStream}.
   */
  public class ClosedOutputStreamTest {
  
      /**
       * Test the {@code flush()} method.
       */
      @Test
      public void testFlush() throws IOException {
          try (ClosedOutputStream cos = new ClosedOutputStream()) {
              assertThrows(IOException.class, cos::flush);
          }
      }
  
      @Test
      public void testSingleton() throws IOException {
          try (@SuppressWarnings("deprecation")
          ClosedOutputStream cos = ClosedOutputStream.CLOSED_OUTPUT_STREAM) {
              assertThrows(IOException.class, cos::flush);
          }
          try (ClosedOutputStream cos = ClosedOutputStream.INSTANCE) {
              assertThrows(IOException.class, cos::flush);
          }
      }
  
      /**
       * Test the {@code write(b)} method.
       */
      @Test
      public void testWrite() throws IOException {
          try (ClosedOutputStream cos = new ClosedOutputStream()) {
              assertThrows(IOException.class, () -> cos.write('x'));
          }
      }
  
      @Test
      public void testWriteArray() throws IOException {
          try (ClosedOutputStream cos = new ClosedOutputStream()) {
              assertThrows(IOException.class, () -> cos.write(new byte[0]));
              assertThrows(IOException.class, () -> cos.write(new byte[10]));
          }
      }
  
      @Test
      public void testWriteArrayIndex() throws IOException {
          try (ClosedOutputStream cos = new ClosedOutputStream()) {
              assertThrows(IOException.class, () -> cos.write(new byte[0], 0, 0));
              assertThrows(IOException.class, () -> cos.write(new byte[10], 0, 1));
          }
      }
  
  }