/*
    * 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.maven.plugins.assembly.utils;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  
  public class LinuxLineFeedInputStreamTest {
  
      @Test
      public void testSimpleString() throws Exception {
          assertEquals("abc\n", roundtrip("abc"));
      }
  
      @Test
      public void testInTheMiddleOfTheLine() throws Exception {
          assertEquals("a\nbc\n", roundtrip("a\r\nbc"));
      }
  
      @Test
      public void testCrOnly() throws Exception {
          assertEquals("a\nb\n", roundtrip("a\rb"));
      }
  
      @Test
      public void testCrAtEnd() throws Exception {
          assertEquals("a\n", roundtrip("a\r"));
      }
  
      @Test
      public void testMultipleBlankLines() throws Exception {
          assertEquals("a\n\nbc\n", roundtrip("a\r\n\r\nbc"));
      }
  
      @Test
      public void testTwoLinesAtEnd() throws Exception {
          assertEquals("a\n\n", roundtrip("a\r\n\r\n"));
      }
  
      @Test
      public void testRetainLineFeed() throws Exception {
          assertEquals("a\n\n", roundtrip("a\r\n\r\n", false));
          assertEquals("a", roundtrip("a", false));
      }
  
      private String roundtrip(String msg) throws IOException {
          return roundtrip(msg, true);
      }
  
      private String roundtrip(String msg, boolean ensure) throws IOException {
          ByteArrayInputStream baos = new ByteArrayInputStream(msg.getBytes());
  
          try (LinuxLineFeedInputStream lf = new LinuxLineFeedInputStream(baos, ensure)) {
              byte[] buf = new byte[100];
              final int read = lf.read(buf);
              return new String(buf, 0, read);
          }
      }
  }