Test add regression tests for syncclientclass

[amirdeljouyi]

test: add regression tests for SyncClientClass

Motivation and Context

Hey 👋

I added two regression tests for SyncClientClass around sync client generation behavior.

While looking through the generation logic, I noticed the endpoint-discovery override path and EC2 protocol selection were not directly covered by the existing test suite.

Modifications

• Added syncClientEndpointDiscovery_whenRequiredEndpointDiscoveryAllowsEndpointOverride_generatesFallbackAndWarning.
• Added getProtocolSpecs_withEc2Protocol_returnsEc2ProtocolSpec.

Testing

These tests check that endpoint overrides generate the expected fallback and warning behavior for required endpoint discovery, and that EC2 models use the EC2 protocol spec.

Impact on coverage:

• Covers endpoint-discovery override handling, including covered lines for endpoint override warnings and covered lines for required endpoint-discovery fallback generation.
• Covers EC2 protocol selection, including covered lines.
• This adds about 3% line coverage and 12% branch coverage for SyncClientClass.

Targeted tests pass locally.

Screenshots (if appropriate)

Not applicable.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

I hope you find these tests useful. Please let me know if you have any questions or concerns.

Thanks,