/*
    * 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.plugin.surefire.extensions;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.nio.Buffer;
  import java.nio.ByteBuffer;
  import java.nio.channels.WritableByteChannel;
  import java.util.Iterator;
  
  import org.apache.maven.plugin.surefire.log.api.ConsoleLogger;
  import org.apache.maven.surefire.api.booter.Command;
  import org.apache.maven.surefire.extensions.CommandReader;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.invocation.InvocationOnMock;
  import org.mockito.stubbing.Answer;
  
  import static java.util.Arrays.asList;
  import static org.apache.maven.surefire.api.booter.Command.TEST_SET_FINISHED;
  import static org.apache.maven.surefire.api.booter.MasterProcessCommand.RUN_CLASS;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyZeroInteractions;
  import static org.mockito.Mockito.when;
  
  /**
   * Tests for {@link StreamFeeder}.
   */
  public class StreamFeederTest {
      private final ByteArrayOutputStream out = new ByteArrayOutputStream();
      private final WritableByteChannel channel = mock(WritableByteChannel.class);
      private final CommandReader commandReader = mock(CommandReader.class);
      private StreamFeeder streamFeeder;
  
      @Before
      public void setup() throws IOException {
          final Iterator<Command> it =
                  asList(new Command(RUN_CLASS, "pkg.ATest"), TEST_SET_FINISHED).iterator();
          when(commandReader.readNextCommand()).thenAnswer(new Answer<Command>() {
              @Override
              public Command answer(InvocationOnMock invocation) {
                  return it.hasNext() ? it.next() : null;
              }
          });
      }
  
      @After
      public void close() throws IOException {
          if (streamFeeder != null) {
              streamFeeder.disable();
              streamFeeder.close();
          }
      }
  
      @Test
      public void shouldEncodeCommandToStream() throws Exception {
          when(channel.write(any(ByteBuffer.class))).thenAnswer(new Answer<Object>() {
              @Override
              public Object answer(InvocationOnMock invocation) throws IOException {
                  ByteBuffer bb = invocation.getArgument(0);
                  ((Buffer) bb).flip();
                  out.write(bb.array(), 0, ((Buffer) bb).limit());
                  return ((Buffer) bb).limit();
              }
          });
  
          ConsoleLogger logger = mock(ConsoleLogger.class);
          streamFeeder = new StreamFeeder("t", channel, commandReader, logger);
          streamFeeder.start();
  
          streamFeeder.join();
          String commands = out.toString();
  
          String expected = new StringBuilder()
                  .append(":maven-surefire-command:")
                  .append((char) 13)
                  .append(":run-testclass:")
                 .append((char) 5)
                 .append(":UTF-8:")
                 .append((char) 0)
                 .append((char) 0)
                 .append((char) 0)
                 .append((char) 9)
                 .append(":")
                 .append("pkg.ATest")
                 .append(":")
                 .append(":maven-surefire-command:")
                 .append((char) 16)
                 .append(":testset-finished:")
                 .toString();
 
         assertThat(commands).isEqualTo(expected);
 
         verify(channel, times(1)).close();
 
         assertThat(streamFeeder.getException()).isNull();
 
         verifyZeroInteractions(logger);
     }
 
     @Test
     public void shouldFailThread() throws Exception {
         when(channel.write(any(ByteBuffer.class))).thenAnswer(new Answer<Object>() {
             @Override
             public Object answer(InvocationOnMock invocation) throws IOException {
                 throw new IOException();
             }
         });
 
         ConsoleLogger logger = mock(ConsoleLogger.class);
         streamFeeder = new StreamFeeder("t", channel, commandReader, logger);
         streamFeeder.start();
 
         streamFeeder.join();
 
         assertThat(out.size()).isZero();
 
         verify(channel, times(1)).close();
 
         assertThat(streamFeeder.getException()).isNotNull().isInstanceOf(IOException.class);
 
         verifyZeroInteractions(logger);
     }
 }