Arm backend: Add SkipIfNoModelConverter for VGF unit test (#12445)

Signed-off-by: Yufeng Shi <yufeng.shi@arm.com>

Author: YufengShi-dudu

backends/arm/test/common.py

@@ -18,6 +18,7 @@
     arm_executor_runner_exists,
     corstone300_installed,
     corstone320_installed,
+    model_converter_installed,
 )
 from executorch.backends.arm.tosa_specification import TosaSpecification
 from executorch.exir.backend.compile_spec_schema import CompileSpec
@@ -245,6 +246,13 @@ def get_u85_compile_spec_unbuilt(
 )
 """Xfails a test if Corsone320 FVP is not installed, or if the executor runner is not built"""
 
+SkipIfNoModelConverter = pytest.mark.skipif(
+    condition=not (model_converter_installed()),
+    raises=FileNotFoundError,
+    reason="Did not find model-converter on path",
+)
+"""Xfails a test if model-converter is not installed"""
+
 xfail_type = str | tuple[str, type[Exception]]
 
 

backends/arm/test/ops/test_add.py

@@ -7,8 +7,6 @@
 
 from typing import Tuple
 
-import pytest
-
 import torch
 from executorch.backends.arm.arm_backend import get_tosa_spec
 from executorch.backends.arm.quantizer import arm_quantizer
@@ -190,7 +188,7 @@ def test_add_tensor_u85_BI_2(test_data: input_t2):
 
 
 @common.parametrize("test_data", Add.test_data)
-@pytest.mark.skip(reason="Model converter not yet made available")
+@common.SkipIfNoModelConverter
 def test_add_tensor_vgf_fp(test_data: input_t1):
     pipeline = VgfPipeline[input_t1](
         Add(), test_data(), aten_op, exir_op, tosa_version="TOSA-1.0+FP"
@@ -199,7 +197,7 @@ def test_add_tensor_vgf_fp(test_data: input_t1):
 
 
 @common.parametrize("test_data", Add.test_data)
-@pytest.mark.skip(reason="Model converter not yet made available")
+@common.SkipIfNoModelConverter
 def test_add_tensor_vgf_int(test_data: input_t1):
     pipeline = VgfPipeline[input_t1](
         Add(),

backends/arm/test/runner_utils.py

@@ -549,6 +549,15 @@ def corstone320_installed() -> bool:
     return True
 
 
+def model_converter_installed() -> bool:
+    cmd = ["model-converter", "--version"]
+    try:
+        _run_cmd(cmd, check=True)
+    except:
+        return False
+    return True
+
+
 def get_elf_path(target_board):
     elf_path = os.path.join(
         "arm_test",