🧪 [testing improvement] Add unit tests for sanitize_filename

Cachyos/Scripts/WIP/emu/test_sanitize_filename.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+import importlib.util
+import unittest
+import sys
+from pathlib import Path
+
+# Dynamically import cia_3ds_decryptor.py
+file_path = Path(__file__).parent / "cia_3ds_decryptor.py"
+spec = importlib.util.spec_from_file_location("cia_3ds_decryptor", str(file_path))
+if spec is None:
+    raise ImportError(f"Could not load {file_path}")
+decryptor = importlib.util.module_from_spec(spec)
+sys.modules["cia_3ds_decryptor"] = decryptor
+spec.loader.exec_module(decryptor)
+
+
+class TestSanitizeFilename(unittest.TestCase):
+    def test_preservation_of_valid_characters(self):
+        # a-z, A-Z, 0-9, -, _, ., and spaces
+        input_name = "test-FILE_123.3ds"
+        expected = "test-FILE_123.3ds"
+        self.assertEqual(decryptor.sanitize_filename(input_name), expected)
+
+    def test_removal_of_invalid_characters(self):
+        # !@#$%^&*()+={}[]|\:;"'<>,/? should be removed
+        input_name = "test!@#$ %^&*()_+= file.cia"
+        # VALID_CHARS = frozenset("-_abcdefghijklmnopqrstuvwxyz1234567890. ")
+        # "test", " ", "_", " ", "file.cia" are valid
+        expected = "test _ file.cia"
+        self.assertEqual(decryptor.sanitize_filename(input_name), expected)
+
+    def test_fallback_behavior(self):
+        # If all characters are removed, the original name is returned.
+        input_name = "!!!@@@###"
+        # All are invalid, so 'out' would be empty, returns original
+        expected = "!!!@@@###"
+        self.assertEqual(decryptor.sanitize_filename(input_name), expected)
+
+    def test_mixed_case_preservation(self):
+        input_name = "MixedCaseFILENAME.3ds"
+        expected = "MixedCaseFILENAME.3ds"
+        self.assertEqual(decryptor.sanitize_filename(input_name), expected)
+
+    def test_empty_string(self):
+        self.assertEqual(decryptor.sanitize_filename(""), "")
+
+if __name__ == '__main__':
+    unittest.main()