Autoloading class files for PHPUnit - php

Question

So, I am just playing around with PHPUnit, I don't really need it but I want to learn how it works so I am trying it out on a random class in a plugin of mine.
The issue I have rn is that whenever I run phpunit I says the Plot class in my test was not found. In my composer.json file I have
{
"require": {
"phpunit/phpunit": "^8.5"
},
"autoload":{
"psr-4" : { "\\mohagames\\PlotArea\\utils\\" : "src/mohagames/PlotArea/utils/"}
}
}
And my Plot.php file is in the C:\Users\moham\Documents\GitHub\PlotArea\src\mohagames\PlotArea\utils\ directory and has the mohagames\PlotArea\utils namespace
But for some reason it still says
C:\Users\moham\Documents\GitHub\PlotArea>C:\Users\moham\Documents\Github\PlotArea\vendor\bin\phpunit --debug
PHPUnit 8.5.0 by Sebastian Bergmann and contributors.
Runtime: PHP 7.3.4
Configuration: C:\Users\moham\Documents\GitHub\PlotArea\phpunit.xml
Test 'SampleTest::testPlot' started
Test 'SampleTest::testPlot' ended
Time: 95 ms, Memory: 4.00 MB
There was 1 error:
1) SampleTest::testPlot
Error: Class 'Plot' not found
C:\Users\moham\Documents\GitHub\PlotArea\tests\unit\SampleTest.php:8
ERRORS!
Tests: 1, Assertions: 0, Errors: 1.
And the SampleTest test class:
<?php
use PHPUnit\Framework\TestCase;
class SampleTest extends TestCase{
public function testPlot(){
$plot = new Plot();
}
}
I've tried all sort of solutions on the internet but none of them worked

Answer 1

Like Alister pointed out importing the class first works otherwise, PHP doesn't know what class the code is referring to.
<?php
use PHPUnit\Framework\TestCase;
use mohagames\PlotArea\utils\Plot;
class SampleTest extends TestCase{
public function testPlot(){
$plot = new Plot();
}
}