Update test_main.py

[codecov[bot]]

Codecov Report

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

Project coverage is 52.47%. Comparing base (a7c5782) to head (8fb0b38).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #934 +/- ## =========================================== + Coverage 51.84% 52.47% +0.63% =========================================== Files 179 179 Lines 19091 19091 =========================================== + Hits 9897 10018 +121 + Misses 9194 9073 -121 ``` | [Flag](https://app.codecov.io/gh/TheDeanLab/navigate/pull/934/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TheDeanLab) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/TheDeanLab/navigate/pull/934/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TheDeanLab) | `52.47% <ø> (+0.63%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TheDeanLab#carryforward-flags-in-the-pull-request-comment) to find out more.

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