--- ../tests/CoerceTest.php	2026-07-07 14:42:25.360354059 +0300
+++ ../tests/CoerceTest.php	2026-07-07 15:09:25.038671020 +0300
@@ -6,20 +6,20 @@
 
 use League\HTMLToMarkdown\Coerce;
 use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 final class CoerceTest extends TestCase
 {
     /**
-     * @dataProvider provideStringTestCases
-     *
      * @param mixed $val
      */
+    #[DataProvider('provideStringTestCases')]
     public function testToString($val, string $expected): void
     {
         $this->assertSame($expected, Coerce::toString($val));
     }
 
-    public function provideStringTestCases(): \Generator
+    public static function provideStringTestCases(): \Generator
     {
         yield ['foo', 'foo'];
         yield [1, '1'];
@@ -27,14 +27,13 @@
         yield [true, '1'];
         yield [false, ''];
         yield [null, ''];
-        yield [$this, $this->__toString()];
+         yield [new StringableFixture(), 'some object'];
     }
 
     /**
-     * @dataProvider provideInvalidStringTestCases
-     *
      * @param mixed $val
      */
+    #[DataProvider('provideInvalidStringTestCases')]
     public function testToStringThrowsOnUncoercableValue($val): void
     {
         $this->expectException(\InvalidArgumentException::class);
@@ -43,12 +42,15 @@
         Coerce::toString($val);
     }
 
-    public function provideInvalidStringTestCases(): \Generator
+    public static function provideInvalidStringTestCases(): \Generator
     {
         yield [new \stdClass()];
         yield [STDOUT];
     }
+}
 
+final class StringableFixture
+{
     public function __toString(): string
     {
         return 'some object';