/*
    * 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;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  
  import org.junit.jupiter.api.Test;
  
  public class UnixLineEndingInputStreamTest {
  
      private String roundtrip(final String msg) throws IOException {
          return roundtrip(msg, true);
      }
  
      private String roundtrip(final String msg, final boolean ensure) throws IOException {
          try (final ByteArrayInputStream baos = new ByteArrayInputStream(msg.getBytes(StandardCharsets.UTF_8));
              final UnixLineEndingInputStream lf = new UnixLineEndingInputStream(baos, ensure)) {
              final byte[] buf = new byte[100];
              return new String(buf, 0, lf.read(buf), StandardCharsets.UTF_8);
          }
      }
  
      @Test
      public void testCrAtEnd() throws Exception {
          assertEquals("a\n", roundtrip("a\r"));
      }
  
      @Test
      public void testCrOnlyEnsureAtEof() throws Exception {
          assertEquals("a\nb\n", roundtrip("a\rb"));
      }
  
      @Test
      public void testCrOnlyNotAtEof() throws Exception {
          assertEquals("a\nb", roundtrip("a\rb", false));
      }
  
      @Test
      public void testInTheMiddleOfTheLine() throws Exception {
          assertEquals("a\nbc\n", roundtrip("a\r\nbc"));
      }
  
      @Test
      public void testMultipleBlankLines() throws Exception {
          assertEquals("a\n\nbc\n", roundtrip("a\r\n\r\nbc"));
      }
  
      @Test
      public void testRetainLineFeed() throws Exception {
          assertEquals("a\n\n", roundtrip("a\r\n\r\n", false));
          assertEquals("a", roundtrip("a", false));
      }
  
      @Test
      public void testSimpleString() throws Exception {
          assertEquals("abc\n", roundtrip("abc"));
      }
  
      @Test
      public void testTwoLinesAtEnd() throws Exception {
          assertEquals("a\n\n", roundtrip("a\r\n\r\n"));
      }
  
  }