/*
    * 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.input.buffer;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Tests {@link CircularByteBuffer}.
   */
  public class CircularByteBufferTest {
  
      @Test
      public void testAddInvalidOffset() {
          final CircularByteBuffer cbb = new CircularByteBuffer();
          assertThrows(IllegalArgumentException.class, () -> cbb.add(new byte[] { 1, 2, 3 }, -1, 3));
      }
  
      @Test
      public void testAddNegativeLength() {
          final CircularByteBuffer cbb = new CircularByteBuffer();
          final byte[] targetBuffer = { 1, 2, 3 };
          assertThrows(IllegalArgumentException.class, () -> cbb.add(targetBuffer, 0, -1));
      }
  
      @Test
      public void testAddNullBuffer() {
          final CircularByteBuffer cbb = new CircularByteBuffer();
          assertThrows(NullPointerException.class, () -> cbb.add(null, 0, 3));
      }
  
      /**
       * Tests for add function with 3 arguments of type byte[], int and int.
       */
      @Test
      public void testAddValidData() {
          final CircularByteBuffer cbb = new CircularByteBuffer();
          final int length = 3;
          cbb.add(new byte[] { 3, 6, 9 }, 0, length);
          assertEquals(length, cbb.getCurrentNumberOfBytes());
      }
  
      @Test
      public void testPeekWithExcessiveLength() {
          assertFalse(new CircularByteBuffer().peek(new byte[] { 1, 3, 5, 7, 9 }, 0, 6));
      }
  
      @Test
      public void testPeekWithInvalidOffset() {
          final CircularByteBuffer cbb = new CircularByteBuffer();
          final IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> cbb.peek(new byte[] { 2, 4, 6, 8, 10 }, -1, 5));
          assertEquals("Illegal offset: -1", e.getMessage());
      }
  
      @Test
      public void testPeekWithNegativeLength() {
          final CircularByteBuffer cbb = new CircularByteBuffer();
          final IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> cbb.peek(new byte[] { 1, 4, 3 }, 0, -1));
          assertEquals("Illegal length: -1", e.getMessage());
      }
  
      // Tests for peek function
      @Test
      public void testPeekWithValidArguments() {
          assertFalse(new CircularByteBuffer().peek(new byte[] { 5, 10, 15, 20, 25 }, 0, 5));
      }
  }