diff --git a/tests/test_issue_19_plugin_architecture.py b/tests/test_issue_19_plugin_architecture.py
index 4005024f..1b937371 100644
--- a/tests/test_issue_19_plugin_architecture.py
+++ b/tests/test_issue_19_plugin_architecture.py
@@ -205,7 +205,7 @@ class TestProcessorPlugin:
 
         # Test with both options
         result = processor.process("hello", uppercase=True, reverse=True)
-        assert result == "OLLAH"
+        assert result == "OLLEH"
 
 
 class TestFormatterPlugin:
@@ -768,7 +768,7 @@ class TestPluginIntegration:
                 )
 
             def process(self, content, **kwargs):
-                prefix = kwargs.get('prefix', '')
+                prefix = kwargs.get('prefix', self.config.get('prefix', ''))
                 return f"{prefix}{content}"
 
         # 2. Verify registration