test: Add network tests #717

Job	Run time
changes	5s
run-checks (ubuntu-latest, stable)	1m 28s
run-tests (ubuntu-latest, stable, all)	9m 23s
run-docs	4m 35s
run-checks (ubuntu-latest, nightly)	2m 14s
run-deny	1m 32s
run-tests (ubuntu-latest, stable, none)	8m 15s
run-checks (macos-latest, stable)	1m 32s
run-tests (ubuntu-latest, nightly, all)	8m 42s
run-checks (macos-latest, nightly)	6m 23s
run-tests-windows (stable, all)	25m 54s
run-tests (ubuntu-latest, nightly, none)	8m 23s
run-checks (windows-latest, stable)	3m 23s
run-tests (macos-latest, stable, all)	9m 20s
run-checks (windows-latest, nightly)	6m 18s
run-tests (macos-latest, stable, none)	8m 8s
run-tests-windows (stable, none)	14m 59s
run-tests (macos-latest, nightly, all)	12m 16s
run-tests-windows (nightly, all)	14m 29s
run-tests (macos-latest, nightly, none)	11m 1s
run-tests-windows (nightly, none)	11m 25s
	2h 49m 45s

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