Test nodes module

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.82 :tada:

Comparison is base (4c0b7f4) 76.00% compared to head (60d3dc0) 76.83%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #468 +/- ## ========================================== + Coverage 76.00% 76.83% +0.82% ========================================== Files 24 25 +1 Lines 3597 3617 +20 ========================================== + Hits 2734 2779 +45 + Misses 863 838 -25 ``` | Flag | Coverage Δ | | |---|---|---| | python-3.10 | `76.83% <100.00%> (+0.82%)` | :arrow_up: | | python-3.8 | `76.88% <100.00%> (+0.82%)` | :arrow_up: | | python-3.9 | `76.88% <100.00%> (+0.82%)` | :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/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | Coverage Δ | | |---|---|---| | [aiidalab\_widgets\_base/nodes.py](https://codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-YWlpZGFsYWJfd2lkZ2V0c19iYXNlL25vZGVzLnB5) | `95.20% <100.00%> (+14.62%)` | :arrow_up: | | [tests/test\_nodes.py](https://codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/468?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-dGVzdHMvdGVzdF9ub2Rlcy5weQ==) | `100.00% <100.00%> (ø)` | | 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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