[Feature Request]: Improve unit tests for goftest

[donyunardi]

Feature description

Improve unit tests for goftest, min at 80%.
Please fork the project under insightengineering and submit a PR.

Related issue:
baddstats/goftest#6

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[llrs-roche]

Today Franek is on holidays and we don't have enough permissions to fork it into insightsengineering:

[donyunardi]

Forked to insightengineering:
https://github.com/insightsengineering/goftest

[averissimo]

We might re-use some of SciPy tests for the statistical tests in goftest:

https://github.com/scipy/scipy/blob/1e9a17b001c24e833eed24622741db8af92dc198/scipy/stats/tests/test_hypotests.py#L108

[osenan]

The PR to review is in here:
insightsengineering/goftest#1