phpunit.dataProviderStatic - Phpstan

This error is reported by phpstan/phpstan-phpunit.

Code example

php

<?php declare(strict_types = 1);

use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\TestCase;

class FooTest extends TestCase
{
	#[DataProvider('provideData')]
	public function testSomething(string $value): void
	{
		self::assertNotEmpty($value);
	}

	public function provideData(): iterable
	{
		yield ['bar'];
	}
}

Why is it reported?

PHPUnit 10 and newer require data provider methods to be static. The referenced data provider method is not declared as static. Non-static data providers are deprecated since PHPUnit 10 and will cause errors in future versions.

How to fix it

Add the static keyword to the data provider method:

diff-php

 class FooTest extends TestCase
 {
 	#[DataProvider('provideData')]
 	public function testSomething(string $value): void
 	{
 		self::assertNotEmpty($value);
 	}

-	public function provideData(): iterable
+	public static function provideData(): iterable
 	{
 		yield ['bar'];
 	}
 }