code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC 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.openqa.selenium.grid;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import java.io.ByteArrayOutputStream;
  import java.io.PrintStream;
  import java.io.UnsupportedEncodingException;
  import java.nio.charset.StandardCharsets;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  class MainTest {
  
    ByteArrayOutputStream out;
    ByteArrayOutputStream err;
  
    @BeforeEach
    public void init() {
      out = new ByteArrayOutputStream();
      err = new ByteArrayOutputStream();
    }
  
    private PrintStream toPrintStream(ByteArrayOutputStream baos) {
      try {
        return new PrintStream(baos, true, StandardCharsets.UTF_8.name());
      } catch (UnsupportedEncodingException e) {
        throw new RuntimeException(e);
      }
    }
  
    @Test
    void shouldPrintAListOfCommandsWhenStartedWithoutOptions() {
      new Main(toPrintStream(out), toPrintStream(err), new String[] {}).go();
      assertThat(out.toString()).contains("A list of all the commands available");
    }
  
    @Test
    void shouldPrintAListOfCommandsWhenStartedWithHelpOption() {
      new Main(toPrintStream(out), toPrintStream(err), new String[] {"--help"}).go();
      assertThat(out.toString()).contains("A list of all the commands available");
    }
  }
  