Arm backend: Add test for evaluate_model.py

Add two tests that exercise evaluate_model.py with different command
line arguments.

Signed-off-by: Martin Lindström <Martin.Lindstroem@arm.com>
Change-Id: I47304ea270518703dc4c826c4c6672c7aca95228

Author: Martin Lindström

backends/arm/test/misc/test_evaluate_model.py

@@ -0,0 +1,71 @@
+# Copyright 2026 Arm Limited and/or its affiliates.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+import json
+import sys
+from pathlib import Path
+
+from backends.arm.scripts import evaluate_model
+
+
+def _run_evaluate_model(*args: str) -> None:
+    previous_argv = sys.argv
+    try:
+        sys.argv = ["evaluate_model.py", *args]
+        evaluate_model.main()
+    finally:
+        sys.argv = previous_argv
+
+
+def test_evaluate_model_tosa_INT(tmp_path: Path) -> None:
+    intermediates = tmp_path / "test_evaluate_model_tosa_INT_intermediates"
+    output = tmp_path / "test_evaluate_model_tosa_INT_metrics.json"
+
+    _run_evaluate_model(
+        "--model_name",
+        "add",
+        "--target",
+        "TOSA-1.0+INT",
+        "--quant_mode",
+        "int8",
+        "--no_delegate",
+        "--evaluators",
+        "numerical",
+        "--intermediates",
+        str(intermediates),
+        "--output",
+        str(output),
+    )
+
+    assert output.exists(), f"Metrics file not created at {output}"
+    data = json.loads(output.read_text())
+    assert data["name"] == "add"
+    assert "metrics" in data
+    assert "mean_absolute_error" in data["metrics"]
+
+
+def test_evaluate_model_tosa_FP(tmp_path: Path) -> None:
+    intermediates = tmp_path / "test_evaluate_model_tosa_FP_intermediates"
+    output = tmp_path / "test_evaluate_model_tosa_FP_metrics.json"
+
+    _run_evaluate_model(
+        "--model_name",
+        "add",
+        "--target",
+        "TOSA-1.0+FP",
+        "--evaluators",
+        "numerical",
+        "--intermediates",
+        str(intermediates),
+        "--output",
+        str(output),
+    )
+
+    assert output.exists(), f"Metrics file not created at {output}"
+    data = json.loads(output.read_text())
+    assert data["name"] == "add"
+    assert "metrics" in data
+    assert "mean_absolute_error" in data["metrics"]
+    assert "compression_ratio" in data["metrics"]