test: exec 单测独立文件

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.38%. Comparing base (f95c939) to head (f536baa). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #123 +/- ## ======================================= Coverage 94.38% 94.38% ======================================= Files 6 6 Lines 1228 1228 Branches 164 163 -1 ======================================= Hits 1159 1159 Misses 69 69 ```

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