Increase test coverage

[akaihola]

No description provided.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 1.01%.

Quality metrics	Before	After	Change
Complexity	0.63 ⭐	0.67 ⭐	0.04 👎
Method Length	58.45 ⭐	56.76 ⭐	-1.69 👍
Working memory	13.42 😞	12.96 😞	-0.46 👍
Quality	68.70% 🙂	69.71% 🙂	1.01% 👍

Other metrics	Before	After	Change
Lines	703	806	103

Changed files	Quality Before	Quality After	Quality Change
src/darker/tests/conftest.py	83.94% ⭐	83.92% ⭐	-0.02% 👎
src/darker/tests/helpers.py	87.80% ⭐	84.61% ⭐	-3.19% 👎
src/darker/tests/test_git.py	64.21% 🙂	64.46% 🙂	0.25% 👍
src/darker/tests/test_linting.py	53.83% 🙂	60.03% 🙂	6.20% 👍
src/darker/tests/test_main.py	65.22% 🙂	65.33% 🙂	0.11% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/darker/tests/test_main.py	test_main	0 ⭐	195 😞	28 ⛔	43.59% 😞	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_git.py	test_git_get_modified_files	4 ⭐	169 😞	17 ⛔	47.06% 😞	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_linting.py	test_run_linter	0 ⭐	147 😞	29 ⛔	47.87% 😞	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_main.py	test_format_edited_parts	0 ⭐	141 😞	21 ⛔	51.04% 🙂	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_git.py	test_git_get_modified_files_revision_range	0 ⭐	113 🙂	32 ⛔	51.51% 🙂	Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

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