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    * Licensed to the Apache Software Foundation (ASF) under one or more
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    * 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.cli.bug;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.CommandLineParser;
  import org.apache.commons.cli.MissingArgumentException;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  import org.apache.commons.cli.PosixParser;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  @SuppressWarnings("deprecation") // tests some deprecated classes
  public class BugCLI71Test {
      private Options options;
      private CommandLineParser parser;
  
      @BeforeEach
      public void setUp() {
          options = new Options();
  
          final Option algorithm = new Option("a", "algo", true, "the algorithm which it to perform executing");
          algorithm.setArgName("algorithm name");
          options.addOption(algorithm);
  
          final Option key = new Option("k", "key", true, "the key the setted algorithm uses to process");
          algorithm.setArgName("value");
          options.addOption(key);
  
          parser = new PosixParser();
      }
  
      @Test
      public void testBasic() throws Exception {
          final String[] args = {"-a", "Caesar", "-k", "A"};
          final CommandLine line = parser.parse(options, args);
          assertEquals("Caesar", line.getOptionValue("a"));
          assertEquals("A", line.getOptionValue("k"));
      }
  
      @Test
      public void testGetsDefaultIfOptional() throws Exception {
          final String[] args = {"-k", "-a", "Caesar"};
          options.getOption("k").setOptionalArg(true);
          final CommandLine line = parser.parse(options, args);
  
          assertEquals("Caesar", line.getOptionValue("a"));
          assertEquals("a", line.getOptionValue('k', "a"));
      }
  
      @Test
      public void testLackOfError() throws Exception {
          final String[] args = {"-k", "-a", "Caesar"};
          try {
              parser.parse(options, args);
              fail("MissingArgumentException expected");
          } catch (final MissingArgumentException e) {
              assertEquals("k", e.getOption().getOpt(), "option missing an argument");
          }
      }
  
      @Test
      public void testMistakenArgument() throws Exception {
          String[] args = {"-a", "Caesar", "-k", "A"};
          CommandLine line = parser.parse(options, args);
          args = new String[] {"-a", "Caesar", "-k", "a"};
          line = parser.parse(options, args);
          assertEquals("Caesar", line.getOptionValue("a"));
          assertEquals("a", line.getOptionValue("k"));
      }
  
  }