feat(tests): test NewPlugin()

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 70.55%. Comparing base (a700f3a) to head (d3bbcae).

Files	Patch %	Lines
pkg/testutils/testutils.go	72.72%	6 Missing :warning:
cmd/plugin.go	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #95 +/- ## =========================================== + Coverage 38.33% 70.55% +32.22% =========================================== Files 7 8 +1 Lines 300 343 +43 =========================================== + Hits 115 242 +127 + Misses 171 101 -70 + Partials 14 0 -14 ```

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