/*
    * 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.compress.archivers.zip;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.ByteArrayInputStream;
  
  import org.apache.commons.compress.utils.ByteUtils;
  import org.junit.jupiter.api.Test;
  
  class BitStreamTest {
  
      @Test
      void testNextByte() throws Exception {
          try (BitStream stream = new BitStream(new ByteArrayInputStream(new byte[] { (byte) 0xEA, 0x35 }))) {
              assertEquals(0, stream.readBit(), "bit 0");
              assertEquals(1, stream.readBit(), "bit 1");
              assertEquals(0, stream.readBit(), "bit 2");
              assertEquals(1, stream.readBit(), "bit 3");
  
              assertEquals(0x5E, stream.nextByte(), "next byte");
              assertEquals(-1, stream.nextByte(), "next byte"); // not enough bits left to read a byte
          }
      }
  
      @Test
      void testNextByteFromEmptyStream() throws Exception {
          try (BitStream stream = new BitStream(new ByteArrayInputStream(ByteUtils.EMPTY_BYTE_ARRAY))) {
              assertEquals(-1, stream.nextByte(), "next byte");
              assertEquals(-1, stream.nextByte(), "next byte");
          }
      }
  
      @Test
      void testReadAlignedBytes() throws Exception {
          try (BitStream stream = new BitStream(new ByteArrayInputStream(new byte[] { (byte) 0xEA, 0x35 }))) {
              assertEquals(0xEA, stream.nextByte(), "next byte");
              assertEquals(0x35, stream.nextByte(), "next byte");
              assertEquals(-1, stream.nextByte(), "next byte");
          }
      }
  }