content: /*
   * 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.kafka.common.utils;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  import org.junit.jupiter.api.condition.DisabledOnOs;
  import org.junit.jupiter.api.condition.OS;
  
  import java.io.IOException;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @Timeout(180)
  @DisabledOnOs(OS.WINDOWS)
  public class ShellTest {
  
      @Test
      public void testEchoHello() throws Exception {
          String output = Shell.execCommand("echo", "hello");
          assertEquals("hello\n", output);
      }
  
      @Test
      public void testHeadDevZero() throws Exception {
          final int length = 100000;
          String output = Shell.execCommand("head", "-c", Integer.toString(length), "/dev/zero");
          assertEquals(length, output.length());
      }
  
      private static final String NONEXISTENT_PATH = "/dev/a/path/that/does/not/exist/in/the/filesystem";
  
      @Test
      public void testAttemptToRunNonExistentProgram() {
          IOException e = assertThrows(IOException.class, () -> Shell.execCommand(NONEXISTENT_PATH),
                  "Expected to get an exception when trying to run a program that does not exist");
          assertTrue(e.getMessage().contains("No such file"), "Unexpected error message '" + e.getMessage() + "'");
      }
  
      @Test
      public void testRunProgramWithErrorReturn() {
          Shell.ExitCodeException e = assertThrows(Shell.ExitCodeException.class,
              () -> Shell.execCommand("head", "-c", "0", NONEXISTENT_PATH));
          String message = e.getMessage();
          assertTrue(message.contains("No such file") || message.contains("illegal byte count"),
              "Unexpected error message '" + message + "'");
      }
  }
  