test: keep generated preview assets under build

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

Author: vitormattos

.gitignore

@@ -6,7 +6,6 @@
 /vendor-bin/**/composer.lock
 /composer.lock
 /build/
-/tests/Fixtures/visible-stamp-assets/
 /.phpunit.result.cache
 /.infection.cache
 /.idea/

tests/Integration/VisibleStampTemplateScenarioTest.php

@@ -27,7 +27,7 @@ public function testPhaseOneVisibleStampLayoutsCanBeCompiledAndExported(
         array $expectedTexts,
     ): void {
         $previewRoot = dirname(__DIR__, 2) . '/build/visible-stamp-previews';
-        $assetRoot = dirname(__DIR__) . '/Fixtures/visible-stamp-assets';
+        $assetRoot = $previewRoot . '/assets';
         $this->ensureDirectoryExists($previewRoot);
         $this->ensureDirectoryExists($assetRoot);