def chaindb_churner(leveldb_churner):
chain = load_mining_chain(FakeAsyncAtomicDB(leveldb_churner))
assert chain.chaindb.get_canonical_head().block_number == 129
return chain.chaindb
def chaindb_1000(leveldb_1000):
chain = load_mining_chain(AtomicDB(leveldb_1000))
assert chain.chaindb.get_canonical_head().block_number == 1000
return chain.chaindb
def chaindb_fresh():
chain = load_mining_chain(FakeAsyncAtomicDB())
assert chain.chaindb.get_canonical_head().block_number == 0
return chain.chaindb
