🧪 Test helper functions

[jtfirek]

The way we are using the helper functions in the new mocked test will not catch bugs introduced in helper functions like prepareTransaction.

essential-eth/src/providers/test/json-rpc-provider/call.test.ts

Lines 81 to 86 in 69cec04

	expect(spy).toHaveBeenCalledWith(
	rpcUrl,
	buildFetchInit(
	buildRPCPostBody('eth_call', [prepareTransaction(data), 'latest']),
	),
	);

We need to make a test for testing the helpers like:
prepareTransaction
buildRPCPostBody
toChecksumAddress
cleanLog
Lmk what other helpers need to be tested @dawsbot

[dawsbot]

Great idea, feel free to make a PR for this whenever @jtfirek . It will be good to be confident our helpers are doing what we think so that one break to helper shows up in the tests right there instead of downstream and we only notice it in a different function!