Add compatibility with Black >= 22.1 (Sourcery refactored)

[sourcery-ai]

Pull Request #270 refactored by Sourcery.

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[sourcery-ai]

Function test_format_edited_parts_all_unchanged refactored with the following changes:

• Replaces an empty collection equality with a boolean operation. (simplify-empty-collection-comparison)

[sourcery-ai]

Function test_format_edited_parts_isort_on_already_formatted refactored with the following changes:

• Replaces an empty collection equality with a boolean operation. (simplify-empty-collection-comparison)

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.02%.

Quality metrics	Before	After	Change
Complexity	1.05 ⭐	1.05 ⭐	0.00
Method Length	98.61 🙂	98.52 🙂	-0.09 👍
Working memory	10.60 😞	10.60 😞	0.00
Quality	67.95% 🙂	67.97% 🙂	0.02% 👍

Other metrics	Before	After	Change
Lines	707	707	0

Changed files	Quality Before	Quality After	Quality Change
src/darker/tests/test_main.py	67.95% 🙂	67.97% 🙂	0.02% 👍

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	6 ⭐	433.96 ⛔	25 ⛔	30.26% 😞	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_main.py	test_format_edited_parts	0 ⭐	195.99 😞	15 😞	50.84% 🙂	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_main.py	test_reformat_single_file	0 ⭐	113 🙂	18 ⛔	56.42% 🙂	Extract out complex expressions
src/darker/tests/test_main.py	test_format_edited_parts_historical	0 ⭐	162 😞	11 😞	59.80% 🙂	Try splitting into smaller methods. Extract out complex expressions
src/darker/tests/test_main.py	test_format_edited_parts_ast_changed	0 ⭐	149.93 😞	9 🙂	64.99% 🙂	Try splitting into smaller methods

Legend and Explanation

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