Phpunit: Class "PHPUnit\TextUI\Command" not found - php

Question

I'm using phpunit for test.
I've put the autoload, psr-4 in cofiguration.json
{
"require-dev": {
"phpunit/phpunit": "^7.5"
},
"autoload": {
"psr-4":{
"Src\\": "src/"
}
}
}
After that, I executed this command in cmd composer dump-autoload, and the test doesn't work. The outputs are that:
C:\xampp\htdocs\phpUnitPractice>.\vendor\bin\phpunit tests\EasyTest.php
PHP Fatal error: Uncaught Error: Class "PHPUnit\TextUI\Command" not found in C:\xampp\htdocs\phpUnitPractice\vendor\phpunit\phpunit\phpunit:61
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\phpUnitPractice\vendor\phpunit\phpunit\phpunit on line 61
Fatal error: Uncaught Error: Class "PHPUnit\TextUI\Command" not found in C:\xampp\htdocs\phpUnitPractice\vendor\phpunit\phpunit\phpunit:61
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\phpUnitPractice\vendor\phpunit\phpunit\phpunit on line 61

Answer 1

That information goes inside composer.json not configuration.json, have a look at this composer.json example. Then run composer dump-autoload.
So, you should have a file like this:
{
"require": {
YOUR REQUIRES
},
"require-dev": {
"phpunit/phpunit": "^7.5"
},
"autoload": {
"psr-4":{
"Src\\": "src/"
}
},
"autoload-dev": {
"psr-4": {
"Tests\\": "tests/"
}
},
}