task: Improve the test case coverage of [integration-tx-api] 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 [integration-tx-api] module is 18.33%, We need to go up to 70% to improve the robustness and stability of our code. [integration-tx-api]模块的测试用例覆盖率为18.33%，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?

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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

[azatyamanaev]

Hello. Can you assign this issue to me?

[azatyamanaev]

I made a pull request for this issue. Can you review it?

[xingfudeshi]

Hello. Can you assign this issue to me?

Hi.This issue has assigned to you.Thanks for your work.