/*
    * 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
    *
    *      https://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.input;
  
  import static org.apache.commons.io.IOUtils.EOF;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.nio.CharBuffer;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link ClosedReader}.
   */
  class ClosedReaderTest {
  
      private void assertEof(final Reader reader) throws IOException {
          assertEquals(EOF, reader.read(), "read()");
      }
  
      @Test
      void testRead() throws IOException {
          try (Reader reader = new ClosedReader()) {
              assertEof(reader);
          }
      }
  
      @Test
      void testReadArray() throws Exception {
          try (Reader reader = new ClosedReader()) {
              assertEquals(EOF, reader.read(new char[4096]));
              assertEquals(EOF, reader.read(new char[1]));
              assertEquals(0, reader.read(new char[0]));
              assertThrows(NullPointerException.class, () -> reader.read((char[]) null));
          }
      }
  
      @Test
      void testReadArrayIndex() throws Exception {
          try (Reader reader = new ClosedReader()) {
              final char[] cbuf = new char[4096];
              assertEquals(EOF, reader.read(cbuf, 0, 2048));
              assertEquals(EOF, reader.read(cbuf, 2048, 2048));
              assertEquals(0, reader.read(cbuf, 4096, 0));
              assertThrows(IndexOutOfBoundsException.class, () -> reader.read(cbuf, -1, 1));
              assertThrows(IndexOutOfBoundsException.class, () -> reader.read(cbuf, 0, 4097));
              assertThrows(IndexOutOfBoundsException.class, () -> reader.read(cbuf, 1, -1));
  
              assertEquals(EOF, reader.read(new char[1]));
              assertEquals(0, reader.read(new char[0]));
              assertThrows(NullPointerException.class, () -> reader.read(null, 0, 0));
          }
      }
  
      @Test
      void testReadCharBuffer() throws Exception {
          try (Reader reader = new ClosedReader()) {
              final CharBuffer charBuffer = CharBuffer.wrap(new char[4096]);
              assertEquals(EOF, reader.read(charBuffer));
              charBuffer.position(4096);
              assertEquals(0, reader.read(charBuffer));
  
              assertEquals(EOF, reader.read(CharBuffer.wrap(new char[1])));
              assertEquals(0, reader.read(CharBuffer.wrap(new char[0])));
              assertThrows(NullPointerException.class, () -> reader.read((CharBuffer) null));
          }
      }
  
      @Test
      void testSingleton() throws Exception {
          try (@SuppressWarnings("deprecation")
          Reader reader = ClosedReader.CLOSED_READER) {
              assertEof(reader);
          }
          try (Reader reader = ClosedReader.INSTANCE) {
              assertEof(reader);
          }
      }
  
      @Test
      void testSkip() throws Exception {
          try (Reader reader = new ClosedReader()) {
             assertEquals(0, reader.skip(4096));
             assertEquals(0, reader.skip(1));
             assertEquals(0, reader.skip(0));
         }
     }
 
 }