def test_iterate_chain_on_empty_block_store(self):
"""Given a block store with no blocks, iterate using predecessor iterator
and verify that it results in an empty list.
"""
block_store = BlockStore(DictDatabase())
self.assertEqual([], [b for b in block_store.get_predecessor_iter()])
def test_iterate_chain_on_empty_block_store(self):
"""Given a block store with no blocks, iterate using predecessor
iterator and verify that it results in an empty list.
"""
block_store = BlockStore(
DictDatabase(indexes=BlockStore.create_index_configuration()))
self.assertEqual([], [b for b in block_store.get_predecessor_iter()])
def test_iterate_chain(self):
"""Given a block store, create an predecessor iterator.
1. Create a chain of length 5.
2. Iterate the chain using the get_predecessor_iter from the chain head
3. Verify that the block ids match the chain, in reverse order
"""
block_store = BlockStore(DictDatabase())
chain = self._create_chain(5)
block_store.update_chain(chain)
ids = [b.identifier for b in block_store.get_predecessor_iter()]
self.assertEqual(['abcd4', 'abcd3', 'abcd2', 'abcd1', 'abcd0'], ids)
def test_iterate_chain(self):
"""Given a block store, create an predecessor iterator.
1. Create a chain of length 5.
2. Iterate the chain using the get_predecessor_iter from the chain head
3. Verify that the block ids match the chain, in reverse order
"""
block_store = BlockStore(DictDatabase())
chain = self._create_chain(5)
block_store.update_chain(chain)
ids = [b.identifier for b in block_store.get_predecessor_iter()]
self.assertEqual(
['abcd4', 'abcd3', 'abcd2', 'abcd1', 'abcd0'],
ids)
def test_iterate_chain_from_starting_block(self):
"""Given a block store, iterate if using an predecessor iterator from
a particular start point in the chain.
1. Create a chain of length 5.
2. Iterate the chain using the get_predecessor_iter from block 3
3. Verify that the block ids match the chain, in reverse order
"""
block_store = BlockStore(DictDatabase())
chain = self._create_chain(5)
block_store.update_chain(chain)
block = block_store['abcd2']
ids = [b.identifier for b in block_store.get_predecessor_iter(block)]
self.assertEqual(['abcd2', 'abcd1', 'abcd0'], ids)
def test_fork_detection_on_iteration(self):
"""Given a block store where a fork occurred while using the predecessor
iterator, it should throw a PossibleForkDetectedError.
The fork occurrance will be simulated.
"""
block_store = BlockStore(DictDatabase())
chain = self._create_chain(5)
block_store.update_chain(chain)
iterator = block_store.get_predecessor_iter()
self.assertEqual('abcd4', next(iterator).identifier)
del block_store['abcd3']
with self.assertRaises(PossibleForkDetectedError):
next(iterator)
def test_fork_detection_on_iteration(self):
"""Given a block store where a fork occurred while using the predecessor
iterator, it should throw a PossibleForkDetectedError.
The fork occurrance will be simulated.
"""
block_store = BlockStore(DictDatabase())
chain = self._create_chain(5)
block_store.update_chain(chain)
iterator = block_store.get_predecessor_iter()
self.assertEqual('abcd4', next(iterator).identifier)
del block_store['abcd3']
with self.assertRaises(PossibleForkDetectedError):
next(iterator)
def test_iterate_chain_from_starting_block(self):
"""Given a block store, iterate if using an predecessor iterator from
a particular start point in the chain.
1. Create a chain of length 5.
2. Iterate the chain using the get_predecessor_iter from block 3
3. Verify that the block ids match the chain, in reverse order
"""
block_store = BlockStore(DictDatabase())
chain = self._create_chain(5)
block_store.update_chain(chain)
block = block_store['abcd2']
ids = [b.identifier
for b in block_store.get_predecessor_iter(block)]
self.assertEqual(
['abcd2', 'abcd1', 'abcd0'],
ids)
