Fix tests

Author: dflook

test/test_prefer_single_line.py

@@ -154,10 +154,15 @@ def test_unparse_prefer_single_line_true():
 
 # CLI tests
 
+def _normalize_newlines(text):
+    """Normalize line endings for cross-platform comparison."""
+    return text.replace('\r\n', '\n')
+
+
 def test_cli_default_uses_newlines():
     """CLI without --prefer-single-line uses newlines."""
     code = 'a = 1\nb = 2\nc = 3'
-    expected = os.linesep.join(['a=1', 'b=2', 'c=3'])
+    expected = 'a=1\nb=2\nc=3'
 
     with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=False) as f:
         f.write(code)
@@ -169,7 +174,7 @@ def test_cli_default_uses_newlines():
         ], timeout=30)
 
         assert result.returncode == 0
-        stdout_text = safe_decode(result.stdout)
+        stdout_text = _normalize_newlines(safe_decode(result.stdout))
         assert stdout_text == expected
     finally:
         os.unlink(temp_file)