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Enhancement Request

Add test code for the grpc of the eventmesh-sdk-java module.

Describe the solution you'd like

Module name: eventmesh-sdk-java
located in: eventmesh-sdks/eventmesh-sdk-java
Task status: ×(unfinished) / √(finished)

Notes: This issue will not be closed, if you want to submit a PR to do some unit tests on this module or select some of the following classes to do some unit tests, please submit a detailed issue separately and linked to the PR you submitted.

Unit test coverage:

Are you willing to submit PR?

• Yes I am willing to submit a PR!