diff --git a/test/external_test_opt.py b/test/external_test_opt.py
index dc690d109f..16a43c898a 100644
--- a/test/external_test_opt.py
+++ b/test/external_test_opt.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 import os
-os.environ["LAZY"] = "1"
-os.environ["OPT"] = "2"
+if "OPT" not in os.environ:
+  os.environ["OPT"] = "2"
 
 import gc
 import numpy as np
@@ -104,5 +104,23 @@ class TestOpt(unittest.TestCase):
       print(img_conv)
       assert len(CL.CACHE) == 2, "optimizer didn't fold conv/elu"
 
+  def test_fold_conv_relu(self):
+    img = Tensor.ones(1,4,8,8)
+    c1 = nn.Conv2d(4, 4, kernel_size=3)
+    c2 = nn.Conv2d(4, 4, kernel_size=3)
+    with CLCache():
+      img_conv = img.sequential([c1, Tensor.relu, c2, Tensor.relu]).realize()
+      print(img_conv)
+      assert len(CL.CACHE) == 2, "optimizer didn't fold conv/relu"
+
+  def test_fold_conv_relu_nobias(self):
+    img = Tensor.ones(1,4,8,8)
+    c1 = nn.Conv2d(4, 4, kernel_size=3, bias=False)
+    c2 = nn.Conv2d(4, 4, kernel_size=3, bias=False)
+    with CLCache():
+      img_conv = img.sequential([c1, Tensor.relu, c2, Tensor.relu]).realize()
+      print(img_conv)
+      assert len(CL.CACHE) == 2, "optimizer didn't fold conv/relu"
+
 if __name__ == '__main__':
   unittest.main()
\ No newline at end of file