Add tests for object lists

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (fc5defd) 55.95% compared to head (99679b7) 56.08%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #68 +/- ## ========================================== + Coverage 55.95% 56.08% +0.13% ========================================== Files 31 31 Lines 4543 4543 ========================================== + Hits 2542 2548 +6 + Misses 2001 1995 -6 ``` | [Flag](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/68/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | Coverage Δ | | |---|---|---| | [ubuntu-latest](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/68/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `57.12% <ø> (+0.25%)` | :arrow_up: | | [windows-latest](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/68/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `55.23% <ø> (+0.13%)` | :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=Hadrien+G.#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/68?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | Coverage Δ | | |---|---|---| | [src/object/mod.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/68?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL29iamVjdC9tb2QucnM=) | `23.96% <ø> (+1.30%)` | :arrow_up: |

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