folder stricture reorganize

tests/test_callback_simple.py

@@ -0,0 +1,22 @@
+import requests
+import json
+
+def test_callback():
+    try:
+        url = 'http://127.0.0.1:8051/_dash-update-component'
+        data = {
+            "output": "current-balance.children",
+            "inputs": [{"id": "ultra-fast-interval", "property": "n_intervals", "value": 1}],
+            "changedPropIds": ["ultra-fast-interval.n_intervals"],
+            "state": []
+        }
+        
+        response = requests.post(url, json=data, timeout=10)
+        print(f"Status: {response.status_code}")
+        print(f"Response: {response.text[:1000]}")
+        
+    except Exception as e:
+        print(f"Error: {e}")
+
+if __name__ == "__main__":
+    test_callback()