Convert JUnit assertions to AssertJ assertions #171

Job	Run time
common / build	2m 52s
common / integration-test	8m 1s
link-check / link-check	6s
common / Test (macos-latest, 17)	6m 5s
common / Test (macos-latest, 11)	7m 30s
common / Test (macos-latest, 24)	5m 55s
common / Test (macos-latest, 21)	5m 31s
common / Test (windows-latest, 8)	5m 49s
common / Test (windows-latest, 11)	5m 54s
common / Test (windows-latest, 17)	6m 27s
common / Test (windows-latest, 21)	7m 2s
common / Test (ubuntu-latest, 17)	4m 47s
common / Test (ubuntu-latest, 21)	8m 11s
common / Test (macos-13, 8)	8m 40s
common / Test (ubuntu-latest, 24)	4m 49s
common / Test (ubuntu-latest, 8)	4m 23s
common / markdown-lint-check / markdown-lint-check	17s
common / Test (ubuntu-latest, 11)	4m 43s
common / shell-script-check / shell-script-check	4s
common / Test (windows-latest, 24)	5m 54s
common / misspell-check / misspell-check	5s
required-status-check	3s
	1h 43m 8s

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