Make the topology test instance weirder, fix the tests

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (37d494c) 51.75% compared to head (2f9ef15) 51.80%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #59 +/- ## ========================================== + Coverage 51.75% 51.80% +0.05% ========================================== Files 30 30 Lines 4359 4366 +7 ========================================== + Hits 2256 2262 +6 - Misses 2103 2104 +1 ``` | [Flag](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/59/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/59/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `52.00% <100.00%> (+0.05%)` | :arrow_up: | | [windows-latest](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/59/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `51.72% <100.00%> (+0.10%)` | :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/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | Coverage Δ | | |---|---|---| | [src/topology/builder.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL3RvcG9sb2d5L2J1aWxkZXIucnM=) | `79.55% <ø> (ø)` | | | [src/topology/mod.rs](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#diff-c3JjL3RvcG9sb2d5L21vZC5ycw==) | `90.41% <100.00%> (+0.41%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/59/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.)

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