Fix flaky test TestEthClient

[rjl493456442]

Flaky test TestEthClient

FAIL github.com/ethereum/go-ethereum/ethclient 600.327s

panic: test timed out after 10m0s
	running tests:
		TestEthClient (10m0s)
		TestEthClient/AtFunctions (10m0s)

---

--- FAIL: TestTransactionRollbackBehavior (10.15s)
    rollback_test.go:53: failed to send transaction: already known
FAIL

[arnabnandikgp]

I would like to try this! thanks.

[arnabnandikgp]

hey @rjl493456442 actually am new to geth, and having a hard time trying to reproduce the flakiness of the above tests like running the tests multiple times or even in parallel are not helping...can you help me in this regard.

[jwasinger]

@arnabnandikgp The stress tool can help here.

[kashitaka]

@rjl493456442 Hi, Took a quick look and it seemed like a simple fix, so I went ahead and opened a PR: #32280
Let me know if the direction looks good to you.

I noticed that someone else is interested in working on this, so I tried to be mindful not to step on anyone's toes. Hope that's okay — just wanted to help move things forward. Thanks!