如何解决致命错误：未捕获错误：调用未定义的方法PHPUnit_Util_Configuration :: getTestdoxGroupConfiguration（）？

Question

当我在命令提示符上运行phpunit时，会出现如下错误：

Fatal error: Uncaught Error: Call to undefined method PHPUnit_Util_Configuration::getTestdoxGroupConfiguration() in C:\xampp\htdocs\myshop\vendor\phpunit\phpunit\src\TextUI\TestRunner.php:1076
Stack trace:
#0 C:\xampp\htdocs\myshop\vendor\phpunit\phpunit\src\TextUI\TestRunner.php(167): PHPUnit_TextUI_TestRunner->handleConfiguration(Array)
#1 C:\xampp\php\pear\PHPUnit\TextUI\Command.php(176): PHPUnit_TextUI_TestRunner->doRun(Object(PHPUnit_Framework_TestSuite), Array)
#2 C:\xampp\php\pear\PHPUnit\TextUI\Command.php(129): PHPUnit_TextUI_Command->run(Array, true)
#3 C:\xampp\php\phpunit(46): PHPUnit_TextUI_Command::main()
#4 {main}
  thrown in C:\xampp\htdocs\myshop\vendor\phpunit\phpunit\src\TextUI\TestRunner.php on line 1076
PHP Fatal error:  Uncaught Error: Call to undefined method PHPUnit_Util_Configuration::getTestdoxGroupConfiguration() in C:\xampp\htdocs\myshop\vendor\phpunit\phpunit\src\TextUI\TestRunner.php:1076
Stack trace:
#0 C:\xampp\htdocs\myshop\vendor\phpunit\phpunit\src\TextUI\TestRunner.php(167): PHPUnit_TextUI_TestRunner->handleConfiguration(Array)
#1 C:\xampp\php\pear\PHPUnit\TextUI\Command.php(176): PHPUnit_TextUI_TestRunner->doRun(Object(PHPUnit_Framework_TestSuite), Array)
#2 C:\xampp\php\pear\PHPUnit\TextUI\Command.php(129): PHPUnit_TextUI_Command->run(Array, true)
#3 C:\xampp\php\phpunit(46): PHPUnit_TextUI_Command::main()
#4 {main}
  thrown in C:\xampp\htdocs\myshop\vendor\phpunit\phpunit\src\TextUI\TestRunner.php on line 1076

我想测试发送电子邮件的活动是否有效

我该如何解决？