Underscore was forgotten in variable name

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.33%. Comparing base (f1c4302) to head (a95c3b9). Report is 1 commits behind head on master.

Files	Patch %	Lines
src/plugins/tests.jl	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #479 +/- ## ======================================= Coverage 94.33% 94.33% ======================================= Files 24 24 Lines 742 742 ======================================= Hits 700 700 Misses 42 42 ```

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