Test and update the `wizard` module

[yakutovicha]

fixes #461 fixes #343

[codecov[bot]]

Codecov Report

Patch coverage: 97.26% and project coverage change: +1.90 :tada:

Comparison is base (3b7aff7) 77.41% compared to head (35756f1) 79.32%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #466 +/- ## ========================================== + Coverage 77.41% 79.32% +1.90% ========================================== Files 26 27 +1 Lines 3626 3685 +59 ========================================== + Hits 2807 2923 +116 + Misses 819 762 -57 ``` | Flag | Coverage Δ | | |---|---|---| | python-3.10 | `79.32% <97.26%> (+1.90%)` | :arrow_up: | | python-3.8 | `79.35% <97.26%> (+1.88%)` | :arrow_up: | | python-3.9 | `79.35% <97.26%> (+1.88%)` | :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=aiidalab#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/466?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | Coverage Δ | | |---|---|---| | [tests/test\_wizard.py](https://codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/466?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-dGVzdHMvdGVzdF93aXphcmQucHk=) | `96.42% <96.42%> (ø)` | | | [aiidalab\_widgets\_base/wizard.py](https://codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/466?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-YWlpZGFsYWJfd2lkZ2V0c19iYXNlL3dpemFyZC5weQ==) | `92.45% <100.00%> (+57.50%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab)

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