From 07a0560145a4438903cd9aa5c434b60ae1833a35 Mon Sep 17 00:00:00 2001
From: Elijah <elijahahianyo@gmail.com>
Date: Thu, 26 Sep 2024 12:01:00 +0000
Subject: [PATCH] tests fix

---
 reflex/state.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/reflex/state.py b/reflex/state.py
index ab22fd688..22d79120e 100644
--- a/reflex/state.py
+++ b/reflex/state.py
@@ -1277,9 +1277,15 @@ class BaseState(Base, ABC, extra=pydantic.Extra.allow):
             self._mark_dirty()
             return
 
-        if name not in self.vars and name not in self.get_skip_vars():
+        if (
+            not name.startswith("__")
+            and name not in self.vars
+            and name not in self.get_skip_vars()
+        ):
+            available_vars = ", ".join(self.vars) or "None"
             raise AttributeError(
-                f"The state var '{name}' has not been defined in '{type(self).__name__}'. All state vars must be declared before they can be set."
+                f"The state variable '{name}' has not been defined in '{type(self).__name__}'. "
+                f"All state variables must be declared before they can be set. Available vars: {available_vars}"
             )
 
         # Set the attribute.