Added an optional_import check for onnxruntime and applied the @unitt… (#8641)

…est.skipUnless decorator to the test_onnx method.

Fixes #8533  .

### Description

Added an optional_import check for onnxruntime and applied the
@unittest.skipUnless decorator to the test_onnx method. This ensures the
ONNX tests are automatically skipped if the onnxruntime dependency is
missing, preventing the test suite from hanging.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: ytl0623 <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: YunLiu <[email protected]>

Author: 3 people

tests/apps/detection/networks/test_retinanet.py

@@ -23,6 +23,7 @@
 from tests.test_utils import dict_product, skip_if_quick, test_onnx_save, test_script_save
 
 _, has_torchvision = optional_import("torchvision")
+_, has_onnxruntime = optional_import("onnxruntime")
 
 device = "cuda" if torch.cuda.is_available() else "cpu"
 num_anchors = 7
@@ -169,6 +170,7 @@ def test_script(self, model, input_param, input_shape):
             test_script_save(net, data)
 
     @parameterized.expand(TEST_CASES_TS)
+    @unittest.skipUnless(has_onnxruntime, "onnxruntime not installed")
     def test_onnx(self, model, input_param, input_shape):
         try:
             idx = int(self.id().split("test_onnx_")[-1])