phpunit not working on a fresh installation of laravel 5.7

i'm having a problem with my freshly installed Laravel.

when i'm trying to use phpunit command to run default ExampleTest.php , i get this error :

D:\Laravel\Rahimi0151>phpunit
PHP Warning:  "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in C:\xampp\php\pear\PHPUnit\TextUI\Command.php on line 277

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in C:\xampp\php\pear\PHPUnit\TextUI\Command.php on line 277
PHP Warning:  "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in C:\xampp\php\pear\PHPUnit\TextUI\Command.php on line 285

Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in C:\xampp\php\pear\PHPUnit\TextUI\Command.php on line 285
PHPUnit 3.7.21 by Sebastian Bergmann.

Configuration read from D:\Laravel\Rahimi0151\phpunit.xml



Time: 0 seconds, Memory: 4.00Mb

[30;43m[2KNo tests executed!
[0m[2K

and at the bottom, it says : No tests executed!

can someone please help me with a solution?