diff --git a/test/unit/test_viz.py b/test/unit/test_viz.py
index a8e02268eb..82020c87c5 100644
--- a/test/unit/test_viz.py
+++ b/test/unit/test_viz.py
@@ -1,5 +1,6 @@
 import unittest, decimal, json, struct
 from dataclasses import dataclass
+from typing import Generator
 
 from tinygrad.uop.ops import UOp, UPat, Ops, PatternMatcher, TrackedPatternMatcher
 from tinygrad.uop.ops import graph_rewrite, track_rewrites, TRACK_MATCH_STATS
@@ -19,6 +20,10 @@ from tinygrad.uop.ops import tracked_keys, tracked_ctxs, uop_fields, active_rewr
 traces = [(tracked_keys, tracked_ctxs, uop_fields)]
 from tinygrad.viz.serve import get_metadata, uop_to_json, get_details
 def get_viz_list(): return get_metadata(traces)
+def get_viz_details(rewrite_idx:int, step:int) -> Generator[dict, None, None]:
+  lst = get_viz_list()
+  assert len(lst) > rewrite_idx, "only loaded {len(lst)} traces, expecting at least {idx}"
+  return get_details(tracked_ctxs[rewrite_idx][step])
 
 class BaseTestViz(unittest.TestCase):
   def setUp(self):
@@ -129,7 +134,7 @@ class TestViz(BaseTestViz):
       (UPat(Ops.CONST, name="x"), lambda x: x.replace(op=Ops.DEFINE_VAR)),
     ])
     with self.assertRaises(RuntimeError): exec_rewrite(a, [pm])
-    graphs = flatten(x["graph"].values() for x in get_details(tracked_ctxs[0][0]))
+    graphs = flatten(x["graph"].values() for x in get_viz_details(0, 0))
     self.assertEqual(graphs[0], uop_to_json(a)[id(a)])
     self.assertEqual(graphs[1], uop_to_json(b)[id(b)])
     # fallback to NOOP with the error message
@@ -143,7 +148,7 @@ class TestViz(BaseTestViz):
     exec_rewrite(alu, [sym])
     lst = get_viz_list()
     self.assertEqual(len(lst), 1)
-    graphs = [x["graph"] for x in get_details(tracked_ctxs[0][0])]
+    graphs = [x["graph"] for x in get_viz_details(0, 0)]
     # embed const in the parent node when possible
     self.assertEqual(list(graphs[0]), [id(a), id(alu)])
     self.assertEqual(list(graphs[1]), [id(z)])
@@ -247,7 +252,7 @@ class TestVizIntegration(BaseTestViz):
       b = Tensor.empty(1)
       metadata = (alu:=a+b).uop.metadata
       alu.kernelize()
-      graph = next(get_details(tracked_ctxs[0][0]))["graph"]
+      graph = next(get_viz_details(0, 0))["graph"]
     self.assertEqual(len([n for n in graph.values() if repr(metadata) in n["label"]]), 1)
 
 from tinygrad.device import ProfileDeviceEvent, ProfileGraphEvent, ProfileGraphEntry