adjust test so it would've actually failed

Author: jasonvarga

tests/Assets/AssetTest.php

@@ -664,10 +664,14 @@ public function it_gets_last_modified_time()
     }
 
     #[Test]
-    public function it_does_not_throw_when_last_modified_meta_is_missing()
+    public function it_does_not_throw_when_getting_last_modified_and_file_doesnt_exist()
     {
+        // This is really a workaround for an underlying bug.
+        // It's odd for an asset to not have a corresponding file.
+        // Once resolved, this test could be removed, although it doesn't hurt by being here.
+
         Storage::fake('test');
-        Storage::disk('test')->put('foo/test.txt', '');
+        // Intentionally do no not create the actual file.
 
         $asset = (new Asset)->container($this->container)->path('foo/test.txt');