[Tests] Add test for example in "big_models[…]" example folder (#1738)

SUMMARY:
Add a test for the example script in the
“examples/big_models_with_sequential_onloading” folder.


TEST PLAN:
Test run with this test/branch:
https://github.com/neuralmagic/llm-compressor-testing/actions/runs/16968671613

---------

Signed-off-by: Domenic Barbuzzi <[email protected]>

Author: dbarbuzzi

tests/examples/test_big_models_with_sequential_onloading.py

@@ -0,0 +1,31 @@
+from pathlib import Path
+
+import pytest
+
+from tests.examples.utils import (
+    copy_and_run_script,
+    gen_cmd_fail_message,
+    requires_gpu_count,
+)
+
+
+@pytest.fixture
+def example_dir() -> str:
+    return "examples/big_models_with_sequential_onloading"
+
+
+@pytest.mark.example
+@requires_gpu_count(1)
+class TestCompressedInference:
+    """
+    Tests for examples in the "big_models_with_sequential_onloading" example folder.
+    """
+
+    def test_llama33_70b_example_script(self, example_dir: str, tmp_path: Path):
+        """
+        Test for the "llama3.3_70b.py" script in the folder.
+        """
+        script_filename = "llama3.3_70b.py"
+        command, result = copy_and_run_script(tmp_path, example_dir, script_filename)
+
+        assert result.returncode == 0, gen_cmd_fail_message(command, result)