test: better assertion #762

Job	Run time
type-check	1m 24s
test-e2e	46s
global-installation (ubuntu-latest, 20)	2m 24s
ensure-manifests	40s
global-installation (macos-latest, 20)	1m 52s
smoke-test-cli (ubuntu-latest, 20)	1m 13s
global-installation (windows-latest, 20.12.1)	11m 26s
smoke-test-cli (macos-latest, 20)	54s
lint	52s
smoke-test-cli (windows-latest, 20.12.1)	5m 38s
test (18, base)	50s
test-cli (18)	3m 39s
test (18, core)	58s
test (18, cube)	1m 25s
test-cli (20)	3m 53s
test (18, csvw)	50s
test (18, formats)	57s
test (18, ftp)	59s
test (18, graph-store)	1m 28s
test (18, http)	48s
test (18, rdf)	49s
test (18, s3)	47s
test (18, sparql)	47s
test (18, shacl)	52s
test (18, validation)	2m 1s
test (20, base)	45s
test (20, core)	49s
test (20, cube)	1m 17s
test (20, csvw)	58s
test (20, formats)	45s
test (20, ftp)	50s
test (20, graph-store)	1m 10s
test (20, http)	59s
test (20, rdf)	56s
test (20, s3)	58s
test (20, sparql)	56s
test (20, shacl)	47s
test (20, validation)	1m 49s
	1h 1m 11s

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