def test_genesis_chain(db):
k, v, k2, v2 = accounts()
chain = Chain({v: {"balance": utils.denoms.ether * 1}}, difficulty=1)
blk = mine_on_chain(chain)
print('blook', blk)
assert chain.has_block(blk.hash)
assert blk.hash in chain
assert chain.get_block(blk.hash) == blk
assert chain.head == blk
assert chain.get_children(blk) == []
assert chain.get_chain() == [blk]
assert chain.get_block_by_number(1)
assert not chain.get_block_by_number(2)
assert chain.get_block_by_number(1) == blk
def test_simple_chain(db):
k, v, k2, v2 = accounts()
chain = Chain({v: {"balance": utils.denoms.ether * 1}}, difficulty=1)
tx = get_transaction()
blk2 = mine_next_block(chain, transactions=[tx])
blk3 = mine_next_block(chain)
assert blk2.hash in chain
assert blk3.hash in chain
assert chain.has_block(blk2.hash)
assert chain.has_block(blk3.hash)
assert chain.get_block(blk2.hash) == blk2
assert chain.get_block(blk3.hash) == blk3
assert chain.head == blk3
assert chain.get_children(blk2) == [blk3]
assert chain.get_chain() == [blk2, blk3]
assert chain.get_block_by_number(1) == blk2
assert chain.get_block_by_number(2) == blk3
assert not chain.get_block_by_number(3)
assert chain.get_tx_position(tx.hash) == (blk2.number, 0)