[Parameter #0 [ <required> array $config ]] in class Spatie\LaravelData\Support\DataConfig while testing

[elabuwa]

I've got the data object set up as below.

<?php

namespace Instance\Data;

use Carbon\Carbon;
use Spatie\LaravelData\Data;

class ReportingPeriodData extends Data
{
    public function __construct(
      public Carbon $fromDate,
      public Carbon $toDate,
    ) {}
}

I've got the test written as below. I've stripped everything just to have what's needed for this post, but even the below still return the error.

<?php

namespace Tests\Unit\Instance;

use Carbon\Carbon;
use Instance\Data\ReportingPeriodData;
use PHPUnit\Framework\TestCase;


class TestTransactionDateAllowPeriodTest extends TestCase
{
    public function test_is_in_allowed_period(): void
    {
        $reportingData = ReportingPeriodData::from([
            'fromDate' => Carbon::parse('2025-04-01'),
            'toDate' => Carbon::parse('2026-03-31')
        ]);
    }
}

However, I get the below error.

Unresolvable dependency resolving [Parameter #0 [ array $config ]] in class Spatie\LaravelData\Support\DataConfig

at vendor/laravel/framework/src/Illuminate/Container/Container.php:1143
1139▕ protected function unresolvablePrimitive(ReflectionParameter $parameter)
1140▕ {
1141▕ $message = "Unresolvable dependency resolving [$parameter] in class {$parameter->getDeclaringClass()->getName()}";
1142▕
➜ 1143▕ throw new BindingResolutionException($message);
1144▕ }
1145▕
1146▕ /**
1147▕ * Register a new before resolving callback for all types.

  +13 vendor frames 

14 tests/Unit/Instance/TestTransactionDateAllowPeriodTest.php:15

The code runs as expected when a request comes through.
But this errors out simply during creating the first test.

Any hep is greatly appreciated.

Versions
spatie/laravel-data : 3.5.1
laravel/framework : 10.6.1
php : 8.1.14

Also, I've published the config file as well.

There is another thread where the same issue has occured, but it doesn't mention any solutions.

[elabuwa]

I've resolved this.
Turns out, you need to extend from "Tests\TestCase" rather than "PHPUnit\Framework\TestCase".