test: replace reflection with explicit test double for status fallback

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

tests/php/Unit/Db/FileTest.php

@@ -15,6 +15,12 @@
 use OCA\Libresign\Tests\Unit\TestCase;
 use PHPUnit\Framework\Attributes\DataProvider;
 
+final class FileWithNullableStatusForTest extends File {
+	public function forceNullStatusForTest(): void {
+		$this->status = null;
+	}
+}
+
 final class FileTest extends TestCase {
 	private File $file;
 
@@ -58,11 +64,10 @@ public function testHasParentReturnsTrueWhenParentFileIdIsSet(): void {
 	}
 
 	public function testGetStatusReturnsDraftWhenInternalStatusIsNull(): void {
-		$reflectionProperty = new \ReflectionProperty($this->file, 'status');
-		$reflectionProperty->setAccessible(true);
-		$reflectionProperty->setValue($this->file, null);
+		$file = new FileWithNullableStatusForTest();
+		$file->forceNullStatusForTest();
 
-		$this->assertSame(FileStatus::DRAFT->value, $this->file->getStatus());
+		$this->assertSame(FileStatus::DRAFT->value, $file->getStatus());
 	}
 
 	public function testSetStatusRejectsInvalidStatusCode(): void {