package org.apache.maven.plugin.surefire.booterclient.lazytestprovider;
   
   /*
    * 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.
   */
  
  import org.apache.maven.surefire.api.booter.Command;
  import org.apache.maven.surefire.api.booter.MasterProcessCommand;
  import org.apache.maven.surefire.booter.spi.LegacyMasterProcessChannelDecoder;
  import org.apache.maven.surefire.api.booter.MasterProcessChannelDecoder;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  
  import static java.nio.channels.Channels.newChannel;
  import static org.apache.maven.plugin.surefire.booterclient.lazytestprovider.TestLessInputStream.TestLessInputStreamBuilder;
  import static org.apache.maven.surefire.api.booter.Command.SKIP_SINCE_NEXT_TEST;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.SHUTDOWN;
  import static org.apache.maven.surefire.api.booter.Shutdown.EXIT;
  import static org.apache.maven.surefire.api.booter.Shutdown.KILL;
  import static org.apache.maven.plugin.surefire.extensions.StreamFeeder.encode;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.is;
  import static org.hamcrest.Matchers.notNullValue;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  /**
   * Testing cached and immediate commands in {@link TestLessInputStream}.
   *
   * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
   * @since 2.19
   */
  public class TestLessInputStreamBuilderTest
  {
      @Rule
      public final ExpectedException e = ExpectedException.none();
  
      @Test
      public void cachableCommandsShouldBeIterableWithStillOpenIterator()
      {
          TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
          TestLessInputStream is = builder.build();
          Iterator<Command> iterator = builder.getIterableCachable().iterator();
  
          assertFalse( iterator.hasNext() );
  
          builder.getCachableCommands().skipSinceNextTest();
          assertTrue( iterator.hasNext() );
          assertThat( iterator.next(), is( SKIP_SINCE_NEXT_TEST ) );
  
          assertFalse( iterator.hasNext() );
  
          builder.getCachableCommands().shutdown( KILL );
          assertTrue( iterator.hasNext() );
          assertThat( iterator.next(), is( new Command( SHUTDOWN, "KILL" ) ) );
  
          builder.removeStream( is );
      }
  
      @Test
      public void immediateCommands()
          throws IOException
      {
          TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
          TestLessInputStream is = builder.build();
          assertThat( is.availablePermits(), is( 0 ) );
          is.noop();
          assertThat( is.availablePermits(), is( 1 ) );
          is.beforeNextCommand();
          assertThat( is.availablePermits(), is( 0 ) );
          assertThat( is.nextCommand(), is( Command.NOOP ) );
          assertThat( is.availablePermits(), is( 0 ) );
          e.expect( NoSuchElementException.class );
          is.nextCommand();
      }
  
      @Test
      public void combinedCommands()
         throws IOException
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         TestLessInputStream is = builder.build();
         assertThat( is.availablePermits(), is( 0 ) );
         builder.getCachableCommands().skipSinceNextTest();
         is.noop();
         assertThat( is.availablePermits(), is( 2 ) );
         is.beforeNextCommand();
         assertThat( is.availablePermits(), is( 1 ) );
         assertThat( is.nextCommand(), is( Command.NOOP ) );
         assertThat( is.availablePermits(), is( 1 ) );
         builder.getCachableCommands().skipSinceNextTest();
         assertThat( is.availablePermits(), is( 1 ) );
         builder.getImmediateCommands().shutdown( EXIT );
         assertThat( is.availablePermits(), is( 2 ) );
         is.beforeNextCommand();
         assertThat( is.nextCommand().getCommandType(), is( SHUTDOWN ) );
         assertThat( is.availablePermits(), is( 1 ) );
         is.beforeNextCommand();
         assertThat( is.nextCommand(), is( SKIP_SINCE_NEXT_TEST ) );
         assertThat( is.availablePermits(), is( 0 ) );
         builder.getImmediateCommands().noop();
         assertThat( is.availablePermits(), is( 1 ) );
         builder.getCachableCommands().shutdown( EXIT );
         builder.getCachableCommands().shutdown( EXIT );
         assertThat( is.availablePermits(), is( 2 ) );
         is.beforeNextCommand();
         assertThat( is.nextCommand(), is( Command.NOOP ) );
         assertThat( is.availablePermits(), is( 1 ) );
         is.beforeNextCommand();
         assertThat( is.nextCommand().getCommandType(), is( SHUTDOWN ) );
         assertThat( is.availablePermits(), is( 0 ) );
         e.expect( NoSuchElementException.class );
         is.nextCommand();
     }
 
     @Test
     public void shouldDecodeTwoCommands()
             throws IOException
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         final TestLessInputStream pluginIs = builder.build();
         InputStream is = new InputStream()
         {
             private byte[] buffer;
             private int idx;
 
             @Override
             public int read() throws IOException
             {
                 if ( buffer == null )
                 {
                     idx = 0;
                     Command cmd = pluginIs.readNextCommand();
                     if ( cmd != null )
                     {
                         MasterProcessCommand cmdType = cmd.getCommandType();
                         buffer = cmdType.hasDataType() ? encode( cmdType, cmd.getData() ) : encode( cmdType );
                     }
                 }
 
                 if ( buffer != null )
                 {
                     byte b = buffer[idx++];
                     if ( idx == buffer.length )
                     {
                         buffer = null;
                         idx = 0;
                     }
                     return b;
                 }
                 throw new IOException();
             }
         };
         MasterProcessChannelDecoder decoder = new LegacyMasterProcessChannelDecoder( newChannel( is ) );
         builder.getImmediateCommands().shutdown( KILL );
         builder.getImmediateCommands().noop();
         Command bye = decoder.decode();
         assertThat( bye, is( notNullValue() ) );
         assertThat( bye.getCommandType(), is( SHUTDOWN ) );
         assertThat( bye.getData(), is( KILL.name() ) );
         Command noop = decoder.decode();
         assertThat( noop, is( notNullValue() ) );
         assertThat( noop.getCommandType(), is( MasterProcessCommand.NOOP ) );
     }
 
     @Test( expected = UnsupportedOperationException.class )
     public void shouldThrowUnsupportedException1()
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         builder.getImmediateCommands().provideNewTest();
     }
 
     @Test( expected = UnsupportedOperationException.class )
     public void shouldThrowUnsupportedException2()
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         builder.getImmediateCommands().skipSinceNextTest();
     }
 
     @Test( expected = UnsupportedOperationException.class )
     public void shouldThrowUnsupportedException3()
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         builder.getImmediateCommands().acknowledgeByeEventReceived();
     }
 
     @Test( expected = UnsupportedOperationException.class )
     public void shouldThrowUnsupportedException4()
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         builder.getCachableCommands().acknowledgeByeEventReceived();
     }
 
     @Test( expected = UnsupportedOperationException.class )
     public void shouldThrowUnsupportedException5()
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         builder.getCachableCommands().provideNewTest();
     }
 
     @Test( expected = UnsupportedOperationException.class )
     public void shouldThrowUnsupportedException6()
     {
         TestLessInputStreamBuilder builder = new TestLessInputStreamBuilder();
         builder.getCachableCommands().noop();
     }
 }