Improve functional tests #282

Job	Run time
notify-tests (macos-latest)	8m 0s
lint	1m 7s
cabal (9.4.8, macos-latest)	14m 49s
nix (macos-latest)	6m 50s
stack (macos-latest)	14m 35s
cabal (9.4.8, ubuntu-latest)	16m 2s
nix (ubuntu-latest)	5m 12s
stack (ubuntu-latest)	13m 28s
cabal (9.6.4, --project-file cabal.ghc964.project, macos-latest)	14m 23s
cabal (9.6.4, --project-file cabal.ghc964.project, ubuntu-latest)	15m 17s
cabal (9.8.1, macos-latest)	11m 50s
cabal (9.8.1, ubuntu-latest)	13m 4s
release_linux	0s
release_osx	0s
release_linux_static	0s
merge	0s
	2h 14m 37s

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