/*
    * 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.output;
  
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Really not a lot to do here, but checking that no
   * Exceptions are thrown.
   */
  class NullWriterTest {
  
      private static final String TEST_STRING = "ABC";
      private static final char[] TEST_CHARS = TEST_STRING.toCharArray();
  
      @Test
      void testAppendChar() {
          try (NullWriter writer = NullWriter.INSTANCE) {
              assertSame(writer, writer.append('X'));
          }
      }
  
      @Test
      void testAppendCharSequence() {
          try (NullWriter writer = NullWriter.INSTANCE) {
              assertSame(writer, writer.append(TEST_STRING));
              assertSame(writer, writer.append(null));
          }
      }
  
      @Test
      void testAppendCharSequenceWithRange() {
          try (NullWriter writer = NullWriter.INSTANCE) {
              assertSame(writer, writer.append(TEST_STRING, 1, 2));
              assertSame(writer, writer.append(null, 0, 4));
              // Test argument validation
              assertThrows(IndexOutOfBoundsException.class, () -> writer.append(TEST_STRING, -1, 2));
              assertThrows(IndexOutOfBoundsException.class, () -> writer.append(TEST_STRING, 1, 5));
              assertThrows(IndexOutOfBoundsException.class, () -> writer.append(TEST_STRING, 2, 1));
          }
      }
  
      @Test
      void testCloseNoOp() {
          final NullWriter writer = NullWriter.INSTANCE;
          writer.close();
          writer.write(TEST_CHARS);
      }
  
      @Test
      void testFlush() {
          try (NullWriter writer = NullWriter.INSTANCE) {
              writer.flush();
          }
      }
  
      @Test
      void testWriteCharArray() {
          try (NullWriter writer = NullWriter.INSTANCE) {
              writer.write(TEST_CHARS);
              // Test argument validation
              assertThrows(NullPointerException.class, () -> writer.write((char[]) null));
          }
      }
  
      @Test
      void testWriteCharArrayWithOffset() {
          try (NullWriter writer = NullWriter.INSTANCE) {
              writer.write(TEST_CHARS, 1, 2);
              // Test argument validation
              assertThrows(IndexOutOfBoundsException.class, () -> writer.write(TEST_CHARS, -1, 0));
              assertThrows(IndexOutOfBoundsException.class, () -> writer.write(TEST_CHARS, 0, -1));
              assertThrows(IndexOutOfBoundsException.class, () -> writer.write(TEST_CHARS, 0, 4));
              assertThrows(NullPointerException.class, () -> writer.write((char[]) null, 0, 0));
          }
      }
  
      @Test
      void testWriteInt() {
          try (NullWriter writer = NullWriter.INSTANCE) {
              writer.write(42);
          }
     }
 
     @Test
     void testWriteString() {
         try (NullWriter writer = NullWriter.INSTANCE) {
             writer.write(TEST_STRING);
             // Test argument validation
             assertThrows(NullPointerException.class, () -> writer.write((String) null));
         }
     }
 
     @Test
     void testWriteStringWithOffset() {
         try (NullWriter writer = NullWriter.INSTANCE) {
             writer.write(TEST_STRING, 1, 1);
             // Test argument validation
             assertThrows(IndexOutOfBoundsException.class, () -> writer.write(TEST_STRING, -1, 0));
             assertThrows(IndexOutOfBoundsException.class, () -> writer.write(TEST_STRING, 0, -1));
             assertThrows(IndexOutOfBoundsException.class, () -> writer.write(TEST_STRING, 0, 4));
             assertThrows(NullPointerException.class, () -> writer.write((String) null, 0, 0));
         }
     }
 }