A collection of minor improvements to tests

[stdedos]

• Move --cov-report=html to addopts

  Non---cov invocation is unaffected; "no reason" not to generate --cov-report=html in an untracked directory AFAIS.

• Fix tests running via PyCharm

  Would've been better to get the path via requests.config.rootdir, but it looks like a pain to inject the requests fixture here.

• Improve copy-paste docstring from 8756cc4627a66f150197519a2588512511f0c4f3

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c1547d9) 92.16% compared to head (d8db8e4) 92.25%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #26 +/- ## ========================================== + Coverage 92.16% 92.25% +0.08% ========================================== Files 18 18 Lines 536 542 +6 Branches 104 104 ========================================== + Hits 494 500 +6 Misses 29 29 Partials 13 13 ``` | [Flag](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | Coverage Δ | | |---|---|---| | [3.10](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [3.11](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [3.6](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [3.7](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [3.8](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [3.9](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [macos-latest](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [ubuntu-20.04](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [ubuntu-latest](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :arrow_up: | | [windows-latest](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | `92.06% <100.00%> (+0.08%)` | :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=pylint-dev#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev) | Coverage Δ | | |---|---|---| | [tests/base\_tester.py](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev#diff-dGVzdHMvYmFzZV90ZXN0ZXIucHk=) | `91.42% <100.00%> (+0.38%)` | :arrow_up: | | [tests/base\_tester\_test.py](https://app.codecov.io/gh/pylint-dev/pylint-pytest/pull/26?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pylint-dev#diff-dGVzdHMvYmFzZV90ZXN0ZXJfdGVzdC5weQ==) | `100.00% <100.00%> (ø)` | |

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