task: Improve the test case coverage of [seata-spring-boot-starter] module to 70%

[lightClouds917]

Why you need it?

Is your feature request related to a problem? Please describe in details

The test case coverage of [seata-spring-boot-starter] module is 0%, We need to go up to 70% to improve the robustness and stability of our code. [seata-spring-boot-starter]模块的测试用例覆盖率为0%，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

Add any other context or screenshots about the feature request here. 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

[yangli-stu]

I would like to work on this issue. Could you please assign it to me?

[yangli-stu]

I would like to work on this issue. Could you please assign it to me?

@funky-eyes