Add hook cleanup for tests.

Author: T4rk1n

tests/integration/test_hooks.py

@@ -1,9 +1,19 @@
 from flask import jsonify
 import requests
+import pytest
 
 from dash import Dash, Input, Output, html, hooks, set_props
 
 
+@pytest.fixture(scope="module", autouse=True)
+def hook_cleanup():
+    hooks._ns["layout"] = []
+    hooks._ns["setup"] = []
+    hooks._ns["route"] = []
+    hooks._ns["error"] = []
+    hooks._ns["callback"] = []
+
+
 def test_hook001_layout(dash_duo):
     @hooks.layout
     def on_layout(layout):