test: integrate jest-extended matchers

[hanna-skryl]

Closes #578

This pull request integrates jest-extended matchers, sets up eslint-plugin-jest-extended, and fixes rules automatically fixable by the --fix CLI option.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared current commit f5f04ca with previous commit d32a643.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 32	🔴 31
Updates	🟡 76	🟡 76
Code coverage	🟢 90	🟢 90
Security	🔴 0	🔴 0	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Type Safety	🟢 100	🟢 100	–
Bug prevention	🟢 100	🟢 100	–
Miscellaneous	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–
Documentation	🔴 23	🔴 23	–

👍 1 group improved, 👎 2 groups regressed, 👍 1 audit improved, 👎 5 audits regressed, 14 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🔴 32	🔴 31
JS Packages	NPM outdated dependencies	🟡 76	🟡 76
Code coverage	Code coverage metrics	🟢 90	🟢 90

18 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Speed Index	🟥 7.3 s	🟥 8.5 s
Lighthouse	First Contentful Paint	🟥 3.1 s	🟥 3.4 s
JS Packages	Outdated NPM dev dependencies.	🟨 55 outdated package versions (30 major, 21 minor, 4 patch)	🟨 55 outdated package versions (30 major, 21 minor, 4 patch)
Lighthouse	Time to Interactive	🟥 17.2 s	🟥 18.5 s
Code coverage	Line coverage	🟨 86.8 %	🟨 86.8 %
Code coverage	Branch coverage	🟨 85.1 %	🟨 85.1 %
Lighthouse	Avoids enormous network payloads	🟩 Total size was 2,647 KiB	🟩 Total size was 2,652 KiB
Lighthouse	Minimizes main-thread work	🟥 16.5 s	🟥 21.1 s
Lighthouse	Total Blocking Time	🟥 4,420 ms	🟥 6,370 ms
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Largest Contentful Paint	🟥 11.6 s	🟥 12.8 s
Lighthouse	JavaScript execution time	🟥 8.8 s	🟥 9.9 s
Lighthouse	Max Potential First Input Delay	🟥 1,670 ms	🟥 2,350 ms
Lighthouse	Server Backend Latencies	🟩 970 ms	🟩 1,650 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 30 resources found	🟨 30 resources found
Lighthouse	Reduce unused CSS	🟥 Potential savings of 102 KiB	🟥 Potential savings of 102 KiB
Lighthouse	Initial server response time was short	🟩 Root document took 520 ms	🟩 Root document took 460 ms
Lighthouse	Reduce unused JavaScript	🟥 Potential savings of 579 KiB	🟥 Potential savings of 579 KiB
Lighthouse	Remove duplicate modules in JavaScript bundles	🟥 Potential savings of 94 KiB	🟥 Potential savings of 94 KiB
Lighthouse	Network Round Trip Times	🟩 30 ms	🟩 40 ms

585 other audits are unchanged.

[matejchalk]

Nice one, looking forward to using it 🙂