remove mocha #1547

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 10s
test (ubuntu-latest, 28.2, false)	1m 55s
test (ubuntu-latest, 29.4, false)	3m 42s
test (macos-latest, 27.2, false)	1m 13s
test (macos-latest, 28.2, false)	1m 57s
test (macos-latest, 29.4, false)	3m 48s
test (windows-latest, 27.2, false)	1m 12s
test (windows-latest, 28.2, false)	1m 44s
test (windows-latest, 29.4, false)	3m 36s
test (ubuntu-latest, snapshot, true)	2m 43s
test (macos-latest, snapshot, true)	3m 6s
test (windows-latest, snapshot, true)	2m 50s
	28m 56s

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