WIP: fix Seth tests #27

Job	Run time
test (seth-test-anvil)	1m 23s
test (seth-test-geth)	2m 0s
test (seth-test-anvil-api)	1m 25s
test (seth-test-geth-api)	1m 51s
test (seth-test-anvil-trace)	2m 0s
test (seth-test-geth-trace)	2m 53s
test (seth-test-anvil-cli)	1m 19s
test (seth-test-geth-cli)	1m 19s
test (seth-test-anvil-gas-bumping)	1m 14s
test (seth-test-geth-gas-bumping)	1m 9s
test (seth-test-anvil-others)	2m 19s
test (seth-test-geth-others)	2m 33s
	21m 25s

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