def test_is_block_valid():
last_block = Block.genesis_block()
block = Block.mine_block(last_block, "dummy data")
Block.is_block_valid(last_block, block)
# bad last hash check
block = Block.mine_block(last_block, "dummy data")
block.last_hash = "evil_last_hash"
with pytest.raises(
Exception,
match=
"The last block hash and the last hash of the new block should match"
):
Block.is_block_valid(last_block, block)
# bad proof of work
block = Block.mine_block(last_block, "dummy data")
block.hash = "aaaaa"
with pytest.raises(Exception, match="Proof of work requirement not met"):
Block.is_block_valid(last_block, block)
# difficulty tampered
difficulty = 10
block = Block.mine_block(last_block, "dummy data")
block.difficulty = difficulty
block.hash = f"{'0' * difficulty}1111a"
with pytest.raises(Exception,
match="The block difficulty must only adjust by 1"):
Block.is_block_valid(last_block, block)
def test_slowly_mined_block():
last_block = Block.mine_block(Block.genesis(), 'foo')
# Suspend execution of the calling thread for the given number of seconds.
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == last_block.difficulty - 1
def test_slowly_mined_block():
last_block = Block.mine_block(Block.genesis(), 'foo')
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == last_block.difficulty - 1
def test_slowly_mined_block():
last_block = Block.mine_block(Block.genesis(), 'foo')
print(f'last_block: {last_block}')
time.sleep(MINE_RATE_SEC)
mined_block = Block.mine_block(last_block, 'bar')
print(f'mined_block: {mined_block}')
assert mined_block.difficulty == last_block.difficulty - 1
def test_slowly_mined_block():
genesis_block = Block.genesis()
last_block = Block.mine_block(genesis_block, 'foo')
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
assert (mined_block.difficulty == 1) | (mined_block.difficulty
== (last_block.difficulty - 1))
def test_quickly_mined_block():
"""Asumimos que el bloque será minado rápidamente, así que la
dificultad debería aumentar en un nivel
"""
last_block = Block.mine_block(Block.genesis(), "foo")
mined_block = Block.mine_block(last_block, "bar")
assert mined_block.difficulty == last_block.difficulty + 1
def test_slowly_mined_block():
last_block = Block.mine_block(Block.genesis(), 'foo')
time.sleep(MINE_RATE / SECONDS)
# /SECONDS as arg is in seconds and the mine rate is calculated in Nanoseconds
# (otherwise the time would sleep for 4 billions seconds)
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == last_block.difficulty - 1
def test_slowly_mined_block():
last_block = Block.mine_block(Block.genesis(), 'test')
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'test2')
# Should be one lower due to its delay
assert mined_block.difficulty == last_block.difficulty - 1
def test_slowly_mined_block():
# Mimic mined blocks that trigger a difficulty lower due to slow mining
last_block = Block.mine_block(Block.genesis(), "foo")
# Create a delay in between mining blocks
time.sleep(DELAY)
mined_block = Block.mine_block(last_block, "bar")
assert mined_block.difficulty == last_block.difficulty - 1
def test_quickly_mined_block():
'''
Purpose:
Test that the difficulty to mine a block increases when a block is
mined to quickly.
'''
last_block = Block.mine_block(Block.genesis(), 'foo')
mined_block = Block.mine_block(last_block, 'bar')
# Assert that difficulty INCREASES by 1 when a block is mined too quickly.
assert (mined_block.difficulty == last_block.difficulty + 1)
def test_slowly_mined_block():
'''
Purpose:
Test that the difficulty to mine a block decreases when a block is
mined too slowly.
'''
last_block = Block.mine_block(Block.genesis(), 'foo')
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
# Assert that difficulty DECREASES by 1 when a block is mined too slowly.
assert (mined_block.difficulty == last_block.difficulty - 1)
def test_slowly_mined_block():
"""Creamos un delay para que el bloque sea minado lentamente, así que la
dificultad debería disminuir en un nivel, MINE_RATE está en nanosegundos,
por ello hay que dividirlo por la variable SEGUNDOS que son los
los nanosegundos en un segundo
"""
last_block = Block.mine_block(Block.genesis(), "foo")
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, "bar")
assert mined_block.difficulty == last_block.difficulty - 1
def test_mined_block_difficulty_limits_at_1():
last_block = Block(time.time_ns(), 'test_last_hash', 'test_hash',
'test_data', 1, 0)
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == 1
def test_limit_mined_block_difficulty_to_1():
last_block = Block(time.time_ns(), "test_last_hash", "test_hash",
"test_data", 1, 0)
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, "bar")
assert mined_block.difficulty == 1
def add_block(self, data):
"""
Add Block to the end of the chain
:param data:
:return:
"""
self.chain.append(Block.mine_block(self.chain[-1], data))
def test_quickly_mined_block_difficulty_limits_at_lower_difficulty():
last_block = Block(time.time_ns(), 'test_last_hash', 'test_hash', 'foo',
LOWER_DIFFICULTY, 0)
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == LOWER_DIFFICULTY
def test_mined_difficulty_limits_at_1():
last_block = Block(time(), 'test_last_hash', 'test_hash', 'test_data', 1,
0)
sleep(MINE_RATE)
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == 1
def test_is_valid_bad_block():
last_block = Block.genesis()
block = Block.mine_block(last_block, 'foo')
block.last_hash = 'evil_lash_harsh'
with pytest.raises(Exception, match='he block last_hash must be correct'):
Block.is_valid_block(last_block, block)
def test_is_valid_block_bad_last_hash():
last_block = Block.genesis()
block = Block.mine_block(last_block, 'test')
block.last_hash = 'bad_last_hash'
with pytest.raises(Exception, match='last_hash must be correct'):
Block.is_valid_block(last_block, block)
def test_difficulty_not_less_one():
last_block = Block(time.time_ns(), 'test_last_hash', 'test_hash',
'test_data', 1, 0)
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'new')
assert mined_block.difficulty == 1
def add_block(self, data): """Adds an instance from the Block class to the attribute chain (list) """ last_block = self.chain[-1] self.chain.append(Block.mine_block(last_block, data))
def test_mine_block():
last_block = Block.genesis()
data = 'test-data'
block = Block.mine_block(last_block, data)
assert isinstance(block, Block)
assert block.data == data
assert block.last_hash == last_block.hash
def test_mine_block():
last_block = Block.genesis()
data = 'test-data'
block = Block.mine_block(last_block, data)
# Insure block object is an instance of the block itself
assert isinstance(block, Block)
assert block.data == data
assert block.last_hash == last_block.hash
def test_lowest_mining_difficulty():
last_block = Block(time.time_ns(), 'test-last_hash', 'test-hash',
'test-data', 1, 0)
time.sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
assert mined_block.difficulty == 1 #ensure that it isnt lower than 1
def test_mine_block_difficulty_limits_at_1():
# Create a mined block with lowest possible difficulty (1)
last_block = Block(time.time_ns(), "test_last_hash", "test_hash",
"test-data", 1, 0)
time.sleep(DELAY)
mined_block = Block.mine_block(last_block, "bar")
assert mined_block.difficulty == 1
def test_mine_block():
gen = Block.genesis()
data = 'test'
block = Block.mine_block(gen,data)
assert isinstance(block, Block)
assert block.last_hash == gen.hash
assert block.data == data
assert hex_to_bin(block.hash)[0:block.difficulty] == '0'* block.difficulty
def test_mine_block():
last_block = Block.genesis()
data = 'test-data'
block = Block.mine_block(last_block, data)
assert isinstance(block, Block)
assert block.data == data
assert block.last_hash == last_block.hash
assert hex_to_binary(block.hash)[0:block.difficulty] == '0' * block.difficulty
def test_mine_block_leading_zeros():
# Set up a block
last_block = Block.genesis()
data = "test-data"
block = Block.mine_block(last_block, data)
# Check that the block hash has the correct number of leading zeros
assert hex_to_binary(
block.hash)[0:block.difficulty] == "0" * block.difficulty
def test_mined_block_minimum_difficulty():
last_block = Block(time_ns(), 'test_last_hash', 'test_hash', 'test_data',
1, 0)
sleep(MINE_RATE / SECONDS)
mined_block = Block.mine_block(last_block, 'bar')
assert last_block.difficulty == mined_block.difficulty
def test_mine_block():
last_block = Block.genesis()
data = 'test'
block = Block.mine_block(last_block, data)
assert isinstance(
block, Block) # it will check wheather block is object of Block class
assert block.data == data
assert block.last_hash == last_block.hash
assert block.hash[0:block.difficulty] == '0' * block.difficulty