fix: resolve CI test failures - fix mock fixture name and complete assertions

tests/test_conversion.py

@@ -1,9 +1,8 @@
 """Tests for conversion service module."""
 
-import pytest
-from unittest.mock import MagicMock, patch
+from unittest.mock import MagicMock
 
-from codexchange.models import Language, ConversionRequest, ConversionResult
+from codexchange.models import Language
 from codexchange.services.conversion_service import ConversionService
 
 
@@ -84,8 +83,8 @@ class TestConversionService:
         
         output = """Here is the converted code:
  ```javascript
- console.log("Hello");
- ```
+console.log("Hello");
+```
 """
         cleaned = service._clean_conversion_output(output)
         assert cleaned == 'console.log("Hello");'
@@ -114,11 +113,11 @@ class TestConversionService:
         service = ConversionService(ollama_service=mock_service)
         
         code = """
- // This is a comment
- function hello() {
+// This is a comment
+function hello() {
     /* Block comment */
     return 1; // inline comment
- }
+}
 """
         count = service.count_comments(code)
         assert count == 3