### Question:
ProcessUtils { public static String buildCommandStr(List<String> commandList) { String cmdstr; String[] cmd = commandList.toArray(new String[commandList.size()]); SecurityManager security = System.getSecurityManager(); boolean allowAmbiguousCommands = false; if (security == null) { allowAmbiguousCommands = true; String value = System.getProperty("jdk.lang.Process.allowAmbiguousCommands"); if (value != null) { allowAmbiguousCommands = !"false".equalsIgnoreCase(value); } } if (allowAmbiguousCommands) { String executablePath = new File(cmd[0]).getPath(); if (needsEscaping(VERIFICATION_LEGACY, executablePath)) { executablePath = quoteString(executablePath); } cmdstr = createCommandLine( VERIFICATION_LEGACY, executablePath, cmd); } else { String executablePath; try { executablePath = getExecutablePath(cmd[0]); } catch (IllegalArgumentException e) { StringBuilder join = new StringBuilder(); for (String s : cmd) { join.append(s).append(' '); } cmd = getTokensFromCommand(join.toString()); executablePath = getExecutablePath(cmd[0]); if (security != null) { security.checkExec(executablePath); } } cmdstr = createCommandLine( isShellFile(executablePath) ? VERIFICATION_CMD_BAT : VERIFICATION_WIN32, quoteString(executablePath), cmd); } return cmdstr; }  static String buildCommandStr(List<String> commandList); static void cancelApplication(List<String> appIds, Logger logger, String tenantCode, String executePath); static void kill(TaskExecutionContext taskExecutionContext); static String getPidsStr(int processId); static void killYarnJob(TaskExecutionContext taskExecutionContext);  }### Answer:
@Test public void testBuildCommandStr() { List<String> commands = new ArrayList<>(); commands.add("sudo"); Assert.assertEquals(ProcessUtils.buildCommandStr(commands), "sudo"); }