task: Improve the test case coverage of [spring] module to 70%

## Why you need it?
Is your feature request related to a problem? Please describe in details
The test case coverage of [spring] module is 18.41%, We need to go up to 70% to improve the robustness and stability of our code.
[spring]模块的测试用例覆盖率为18.41%，我们需要提高到70%，以提高代码的健壮性和稳定性。

## How it could be?
A clear and concise description of what you want to happen. You can explain more about input of the feature, and output of it.

## Other related information
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You can get some help from:
https://seata.apache.org/docs/developers/contributor-guide/test-coverage-guide_dev
https://seata.apache.org/blog/how-to-write-unit-tests