test(generator): add edge case tests for OpenAPI parser content cleaning (#120)

Add comprehensive tests for _clean_spec_content method covering:
- UTF-8 BOM removal
- Smart quotes replacement
- Windows line endings (CRLF to LF)
- Non-breaking spaces conversion
- En-dash and em-dash character conversion

Refs #109

Author: URAYUSHJAIN

generator/tests/parser/test_openapi_parser.py

@@ -201,3 +201,43 @@ def test_get_security_schemes(self, mock_fetch):
         self.assertEqual(security_schemes["bearerAuth"]["type"], "http")
         self.assertEqual(security_schemes["bearerAuth"]["scheme"], "bearer")
         self.assertEqual(security_schemes["bearerAuth"]["bearerFormat"], "JWT")
+
+    def test_clean_spec_content_utf8_bom(self):
+        """Test UTF-8 BOM removal."""
+        parser = OpenAPIParser("dummy_url")
+        content_with_bom = '\ufeff{"openapi": "3.0.0"}'
+        cleaned = parser._clean_spec_content(content_with_bom)
+        self.assertFalse(cleaned.startswith("\ufeff"))
+        self.assertTrue(cleaned.startswith("{"))
+
+    def test_clean_spec_content_smart_quotes(self):
+        """Test smart quotes replacement."""
+        parser = OpenAPIParser("dummy_url")
+        content_with_smart_quotes = "“openapi”: “3.0.0”"
+        cleaned = parser._clean_spec_content(content_with_smart_quotes)
+        self.assertIn('"openapi": "3.0.0"', cleaned)
+
+    def test_clean_spec_content_windows_line_endings(self):
+        """Test CRLF to LF conversion."""
+        parser = OpenAPIParser("dummy_url")
+        content_with_crlf = '{\r\n"openapi": "3.0.0"\r\n}'
+        cleaned = parser._clean_spec_content(content_with_crlf)
+        self.assertNotIn("\r\n", cleaned)
+        self.assertIn("\n", cleaned)
+
+    def test_clean_spec_content_non_breaking_spaces(self):
+        """Test non-breaking spaces conversion."""
+        parser = OpenAPIParser("dummy_url")
+        content_with_nbsp = '{\u00a0"openapi":\u00a0"3.0.0"\u00a0}'
+        cleaned = parser._clean_spec_content(content_with_nbsp)
+        self.assertNotIn("\u00a0", cleaned)
+        self.assertIn(" ", cleaned)
+
+    def test_clean_spec_content_dash_characters(self):
+        """Test en-dash and em-dash conversion."""
+        parser = OpenAPIParser("dummy_url")
+        content_with_dashes = '{"desc": "en–dash, em—dash"}'
+        cleaned = parser._clean_spec_content(content_with_dashes)
+        self.assertNotIn("–", cleaned)
+        self.assertNotIn("—", cleaned)
+        self.assertIn("-", cleaned)