Add missing ExpandoObject test coverage in ObjectVisitorTest

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

ObjectVisitorTest defines the ReturnsExpandoAdapterData data source, but there is currently no corresponding test method executing it to validate ExpandoObject traversal paths correctly.

### Describe the solution you'd like

Add a new unit test method utilizing [MemberData(nameof(ReturnsExpandoAdapterData))] to ensure proper test coverage for ExpandoObject scenarios in ObjectVisitorTest.

### Additional context

"Adding test coverage for existing ReturnsExpandoAdapterData data source in ObjectVisitorTest to ensure robust validation of dynamic types."

Start in ObjectVisitorTest and inspect the existing ReturnsExpandoAdapterData data source. Add a unit test method using [MemberData(nameof(ReturnsExpandoAdapterData))] and confirm that the ExpandoObject traversal scenarios execute successfully.

Written by the indexing model from the issue text.