Add tests for object depth infrastructure

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (74d2f00) 50.29% compared to head (c897129) 50.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #54 +/- ## ========================================== + Coverage 50.29% 50.82% +0.52% ========================================== Files 30 30 Lines 4346 4356 +10 ========================================== + Hits 2186 2214 +28 + Misses 2160 2142 -18 ``` | [Flag](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/54/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/54/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `51.01% <89.47%> (+0.52%)` | :arrow_up: | | [windows-latest](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/54/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `50.73% <89.47%> (+0.53%)` | :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/54?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | Coverage Δ | | |---|---|---| | [src/bitmap.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/54?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL2JpdG1hcC5ycw==) | `100.00% <ø> (ø)` | | | [src/errors.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/54?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL2Vycm9ycy5ycw==) | `100.00% <ø> (ø)` | | | [src/ffi/int.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/54?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL2ZmaS9pbnQucnM=) | `100.00% <ø> (ø)` | | | [src/object/depth.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/54?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL29iamVjdC9kZXB0aC5ycw==) | `100.00% <100.00%> (+40.00%)` | :arrow_up: | | [src/object/mod.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/54?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL29iamVjdC9tb2QucnM=) | `19.26% <33.33%> (ø)` | |

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