test: refactor and actualise Transactions tests #193

Job	Run time
API test set: accounts.test.ts / Node: lts/*	13m 34s
API test set: addresses.test.ts / Node: lts/*	13m 12s
API test set: batches.test.ts / Node: lts/*	12m 27s
API test set: blocks.test.ts / Node: lts/*	12m 9s
API test set: contracts.test.ts / Node: lts/*	12m 51s
API test set: logs.test.ts / Node: lts/*	12m 2s
API test set: stats.test.ts / Node: lts/*	11m 54s
API test set: tokens.test.ts / Node: lts/*	12m 36s
API test set: transactions.test.ts / Node: lts/*	14m 31s
	1h 55m 16s

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