/*
    * 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.shade.resource;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.maven.plugins.shade.relocation.Relocator;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.fail;
  
  /**
   * Tests {@link ApacheLicenseResourceTransformer} parameters.
   */
  public class ApacheNoticeResourceTransformerParameterTests {
  
      private static final String NOTICE_RESOURCE = "META-INF/NOTICE";
      private ApacheNoticeResourceTransformer subject;
  
      @Before
      public void setUp() {
          subject = new ApacheNoticeResourceTransformer();
      }
  
      @Test
      public void testNoParametersShouldNotThrowNullPointerWhenNoInput() throws IOException {
          processAndFailOnNullPointer("");
      }
  
      @Test
      public void testNoParametersShouldNotThrowNullPointerWhenNoLinesOfInput() throws IOException {
          processAndFailOnNullPointer("Some notice text");
      }
  
      @Test
      public void testNoParametersShouldNotThrowNullPointerWhenOneLineOfInput() throws IOException {
          processAndFailOnNullPointer("Some notice text\n");
      }
  
      @Test
      public void testNoParametersShouldNotThrowNullPointerWhenTwoLinesOfInput() throws IOException {
          processAndFailOnNullPointer("Some notice text\nSome notice text\n");
      }
  
      @Test
      public void testNoParametersShouldNotThrowNullPointerWhenLineStartsWithSlashSlash() throws IOException {
          processAndFailOnNullPointer("Some notice text\n//Some notice text\n");
      }
  
      @Test
      public void testNoParametersShouldNotThrowNullPointerWhenLineIsSlashSlash() throws IOException {
          processAndFailOnNullPointer("//\n");
      }
  
      @Test
      public void testNoParametersShouldNotThrowNullPointerWhenLineIsEmpty() throws IOException {
          processAndFailOnNullPointer("\n");
      }
  
      private void processAndFailOnNullPointer(final String noticeText) throws IOException {
          try {
              final ByteArrayInputStream noticeInputStream = new ByteArrayInputStream(noticeText.getBytes());
              final List<Relocator> emptyList = Collections.emptyList();
              subject.processResource(NOTICE_RESOURCE, noticeInputStream, emptyList, 0);
              noticeInputStream.close();
          } catch (NullPointerException e) {
              fail("Null pointer should not be thrown when no parameters are set.");
          }
      }
  }