Fix test failures

[pnuu]

This PR fixes couple of test failures.

• [ ] Closes #xxxx
• [x] Tests added
• [ ] Tests passed
• [ ] Passes flake8 trollflow2
• [ ] Fully documented
• [ ] Add your name to AUTHORS.md if not there already

[codecov[bot]]

Codecov Report

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

Project coverage is 95.80%. Comparing base (0713a86) to head (a4ac1f5). Report is 6 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #201 +/- ## ========================================== + Coverage 95.76% 95.80% +0.03% ========================================== Files 13 13 Lines 2972 3000 +28 ========================================== + Hits 2846 2874 +28 Misses 126 126 ``` | [Flag](https://app.codecov.io/gh/pytroll/trollflow2/pull/201/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pytroll) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/pytroll/trollflow2/pull/201/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pytroll) | `95.80% <100.00%> (+0.03%)` | :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=pytroll#carryforward-flags-in-the-pull-request-comment) to find out more.

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