diff --git a/tests/DonutQueryInterceptorPurgeTest.php b/tests/DonutQueryInterceptorPurgeTest.php
index 8703ccf6..79f659aa 100644
--- a/tests/DonutQueryInterceptorPurgeTest.php
+++ b/tests/DonutQueryInterceptorPurgeTest.php
@@ -51,8 +51,8 @@ public function testStatePurge(): void
         $ro1 = $this->resource->get('page://self/html/blog-posting');
         $this->assertFalse($this->isCreatedByState($ro1));
         $this->assertTrue($this->isStateCached());
-
-        assert($this->repository->purge(new Uri('page://self/html/comment')));
+        $puregeResult = $this->repository->purge(new Uri('page://self/html/comment'));
+        assert($puregeResult);
         $this->assertFalse($this->isStateCached());
 
         $ro2 = $this->resource->get('page://self/html/blog-posting');
diff --git a/tests/DonutRepositoryTest.php b/tests/DonutRepositoryTest.php
index bc184f25..9c41271a 100644
--- a/tests/DonutRepositoryTest.php
+++ b/tests/DonutRepositoryTest.php
@@ -63,7 +63,8 @@ public function testCreateDonut(): void
     /** @depends testCreateDonut */
     public function testCachePurge(): void
     {
-        assert($this->queryRepository->purge($this->uri));
+        $purgeResult = $this->queryRepository->purge($this->uri);
+        $this->assertTrue($purgeResult);
         $maybeNullPurged = $this->queryRepository->get($this->uri);
         $this->assertNull($maybeNullPurged);
     }
@@ -94,7 +95,8 @@ public function testCacheDependency(): void
         $blogState1 = $queryRepository->get(new Uri('page://self/html/blog-posting'));
         $this->assertInstanceOf(ResourceState::class, $blogState1);
         // When cache dependency is deleted, cache dependent automatically deleted
-        assert($queryRepository->purge(new Uri('page://self/html/comment')));
+        $commentResult = $queryRepository->purge(new Uri('page://self/html/comment'));
+        assert($commentResult);
         $blogState2 = $queryRepository->get(new Uri('page://self/html/blog-posting'));
         $this->assertNull($blogState2);
         // Cache created again.
@@ -110,7 +112,8 @@ public function testRefresh(): void
         $queryRepository = $injector->getInstance(QueryRepositoryInterface::class);
 
         $resource->get('page://self/html/blog-posting');
-        assert($queryRepository->purge(new Uri('page://self/html/comment')));
+        $purgeResult = $queryRepository->purge(new Uri('page://self/html/comment'));
+        $this->assertTrue($purgeResult);
         $donutRo = $resource->get('page://self/html/blog-posting');
         $this->assertSame('r', $donutRo->headers[Header::ETAG][-1]);
         $this->assertStringContainsString('blog-posting-page', $donutRo->headers[Header::SURROGATE_KEY]);
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index eddfbae6..b64d04d2 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -5,16 +5,6 @@
 use Koriym\Attributes\AttributeReader;
 use Ray\ServiceLocator\ServiceLocator;
 
-$unlink = static function (string $path) use (&$unlink): void {
-    foreach ((array) glob(rtrim($path, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . '*') as $f) {
-        $file = (string) $f;
-        is_dir($file) ? $unlink($file) : unlink($file);
-        @rmdir($file);
-    }
-};
-$unlink(__DIR__ . '/tmp');
+array_map('unlink', glob(__DIR__ . '/tests/tmp/*.php')); // @phpstan-ignore-line
 
-// no annotation in PHP 8
-if (PHP_MAJOR_VERSION >= 8) { // @phpstan-ignore-line
-    ServiceLocator::setReader(new AttributeReader());
-}
+ServiceLocator::setReader(new AttributeReader());