diff --git a/test/external/external_test_opt.py b/test/external/external_test_opt.py
index 0fb110088a..13c7da92f0 100644
--- a/test/external/external_test_opt.py
+++ b/test/external/external_test_opt.py
@@ -174,5 +174,56 @@ class TestOpt(unittest.TestCase):
     np.testing.assert_allclose(a.numpy().sum(2).transpose(1,0).reshape(4,4,4,4), d.numpy(), rtol=1e-3)
     if PUSH_PERMUTES: assert cache_len == 1, "permute wasn't pushed!"
 
+  @unittest.skip("this is broken")
+  def test_no_binop_rerun(self):
+    a = Tensor.randn(16, 16)
+    b = Tensor.randn(16, 16)
+    with CLCache():
+      c = a*b
+      d = (a*b).reshape(16, 16, 1)
+      c.realize()
+      d.realize()
+      assert len(GlobalCounters.cache) == 1, "binop was rerun!"
+    np.testing.assert_allclose(c.numpy(), d.numpy(), rtol=1e-3)
+
+  @unittest.skip("this is broken")
+  def test_no_binop_rerun_alt(self):
+    a = Tensor.randn(16, 16)
+    b = Tensor.randn(16, 16)
+    with CLCache():
+      c = (a*b).reshape(16, 16, 1)
+      d = a*b
+      c.realize()
+      d.realize()
+      assert len(GlobalCounters.cache) == 1, "binop was rerun!"
+    np.testing.assert_allclose(c.numpy(), d.numpy(), rtol=1e-3)
+
+  # TODO: should be okay with PUSH_PERMUTES
+  def test_no_reduceop_rerun(self):
+    if PUSH_PERMUTES: return
+    a = Tensor.randn(16, 16, 16)
+    with CLCache():
+      c = a.sum(2)
+      d = a.sum(2).permute(1,0)
+      c.realize()
+      d.realize()
+      cache_len = len(GlobalCounters.cache)
+    np.testing.assert_allclose(c.numpy().transpose(1,0), d.numpy())
+    assert cache_len == 1, "reduceop was rerun!"
+
+  # TODO: should be okay with PUSH_PERMUTES
+  def test_no_reduceop_rerun_alt(self):
+    if PUSH_PERMUTES: return
+    a = Tensor.randn(16, 16, 16)
+    with CLCache():
+      c = a.sum(2).permute(1,0)
+      d = a.sum(2)
+      c.realize()
+      d.realize()
+      cache_len = len(GlobalCounters.cache)
+    np.testing.assert_allclose(c.numpy(), d.numpy().transpose(1,0))
+    assert cache_len == 1, "reduceop was rerun!"
+
+
 if __name__ == '__main__':
   unittest.main()