Arm backend: Add arange.default dummy tests (pytorch#10901)

Since we use unittests for coverage on the Edge IR op set which includes
arange.default, we need tests for it even though it is decomposed to
indicate that it has not been missed.

Signed-off-by: Adrian Lundell <[email protected]>

Author: AdrianLundell

backends/arm/test/ops/test_arange.py

@@ -5,6 +5,8 @@
 
 from typing import Callable
 
+import pytest
+
 import torch
 from executorch.backends.arm.test import common
 from executorch.backends.arm.test.tester.test_pipeline import (
@@ -152,3 +154,26 @@ def test_linspace_tosa_BI(test_data: test_data_t):
     )
     pipeline.pop_stage("check.quant_nodes")
     pipeline.run()
+
+
+skip_str = "aten.arange.default is decomposed to aten.arange.start_step, so it will never exist in a lowered graph."
+
+
+@pytest.mark.skip(reason=skip_str)
+def test_arange_tosa_MI():
+    pass
+
+
+@pytest.mark.skip(reason=skip_str)
+def test_arange_tosa_BI():
+    pass
+
+
+@pytest.mark.skip(reason=skip_str)
+def test_arange_u55_BI():
+    pass
+
+
+@pytest.mark.skip(reason=skip_str)
+def test_arange_u85_BI():
+    pass