diff --git a/tests/test_unification_refactoring.py b/tests/test_unification_refactoring.py
new file mode 100644
index 0000000..82e7e0d
--- /dev/null
+++ b/tests/test_unification_refactoring.py
@@ -0,0 +1,66 @@
+import os
+import sys
+import unittest
+from unittest.mock import MagicMock, patch
+
+parent_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+if parent_dir not in sys.path:
+    sys.path.insert(0, parent_dir)
+
+from core.metadata_audit import extract_metadata_size
+from core.settings import load_settings, get_settings_schema
+from core.workflow_analyzer import NODE_TYPE_MODEL_WIDGET_CATEGORIES
+
+
+class TestUnificationRefactoring(unittest.TestCase):
+
+    def test_extract_metadata_size_top_level(self):
+        # 1. Top-level size check
+        meta = {"size": 1000}
+        res = extract_metadata_size(meta, "model.safetensors")
+        self.assertIsNotNone(res)
+        self.assertEqual(res[0], 1000)
+        self.assertEqual(res[1], "size")
+
+    def test_extract_metadata_size_nested(self):
+        # 2. Nested file/file_info check
+        meta = {
+            "file": {
+                "sizeBytes": 2000
+            }
+        }
+        res = extract_metadata_size(meta, "model.safetensors")
+        self.assertIsNotNone(res)
+        self.assertEqual(res[0], 2000)
+        self.assertEqual(res[1], "file.sizeBytes")
+
+    def test_extract_metadata_size_files_list(self):
+        # 3. Files list check
+        meta = {
+            "files": [
+                {"name": "other.safetensors", "size_bytes": 500},
+                {"name": "model.safetensors", "size_kb": 2.0}
+            ]
+        }
+        res = extract_metadata_size(meta, "model.safetensors")
+        self.assertIsNotNone(res)
+        self.assertEqual(res[0], 2048)  # 2.0 * 1024
+        self.assertEqual(res[1], "files[].size_kb")
+
+    def test_settings_schema_structure(self):
+        schema = get_settings_schema()
+        self.assertIsInstance(schema, list)
+        self.assertTrue(len(schema) > 0)
+        for item in schema:
+            self.assertIn("serverKey", item)
+            self.assertIn("type", item)
+            self.assertIn("default", item)
+            self.assertIn("localKey", item)
+
+    def test_node_rules_categories_match(self):
+        self.assertIn("CheckpointLoaderSimple", NODE_TYPE_MODEL_WIDGET_CATEGORIES)
+        self.assertEqual(NODE_TYPE_MODEL_WIDGET_CATEGORIES["CheckpointLoaderSimple"], {0: "checkpoints"})
+
+
+if __name__ == "__main__":
+    unittest.main()