diff --git a/tests/Fake/fake-app/src/Module/BadModule.php b/tests/Fake/fake-app/src/Module/BadModule.php
new file mode 100644
index 00000000..e90e8eda
--- /dev/null
+++ b/tests/Fake/fake-app/src/Module/BadModule.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FakeVendor\HelloWorld\Module;
+
+use BEAR\Sunday\Extension\Error\ThrowableHandlerInterface;
+use BEAR\Sunday\Extension\Router\RouterMatch;
+use Ray\Di\AbstractModule;
+use Throwable;
+
+class BadModule extends AbstractModule
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure(): void
+    {
+        // Invalid. You can not to bind unserializable object.
+        $this->bind(ThrowableHandlerInterface::class)->toInstance(new class implements ThrowableHandlerInterface {
+            public function handle(Throwable $e, RouterMatch $request): ThrowableHandlerInterface
+            {
+            }
+            public function transfer(): void
+            {
+            }
+        });
+    }
+}
diff --git a/tests/Injector/PackageInjectorTest.php b/tests/Injector/PackageInjectorTest.php
index fd98addc..0731c00f 100644
--- a/tests/Injector/PackageInjectorTest.php
+++ b/tests/Injector/PackageInjectorTest.php
@@ -52,13 +52,13 @@ protected function configure(): void
         $this->assertInstanceOf(FakeDep2::class, $page->foo);
     }
 
-    public function testWithNullCacheWarning(): void
+    public function testUnserializableRootObject(): void
     {
         set_error_handler(static function (int $errno, string $errstr): void {
             throw new Exception($errstr, $errno);
         }, E_USER_WARNING);
         $this->expectExceptionMessage('Failed to verify the injector cache.');
-        $injector = PackageInjector::getInstance(new Meta('FakeVendor\HelloWorld'), 'app', new NullAdapter());
+        $injector = PackageInjector::getInstance(new Meta('FakeVendor\HelloWorld'), 'bad-app', new NullAdapter());
         $this->assertInstanceOf(InjectorInterface::class, $injector);
         restore_error_handler();
     }