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test_hashtree.py: get full coverage for hashtree.py

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This commit is contained in:
Brian Warner 2007-04-12 19:58:13 -07:00
parent 30133a7cdf
commit 0ecb26ec44
1 changed files with 22 additions and 2 deletions
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24
src/allmydata/test/test_hashtree.py
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@ -23,6 +23,8 @@ class Complete(unittest.TestCase):
self.failUnlessEqual(ht.get_leaf(0), tagged_hash("tag", "0")) self.failUnlessEqual(ht.get_leaf(0), tagged_hash("tag", "0"))
self.failUnlessRaises(IndexError, ht.get_leaf, 8) self.failUnlessRaises(IndexError, ht.get_leaf, 8)
self.failUnlessEqual(ht.get_leaf_index(0), 7) self.failUnlessEqual(ht.get_leaf_index(0), 7)
self.failUnlessRaises(IndexError, ht.parent, 0)
self.failUnlessRaises(IndexError, ht.needed_for, -1)
def test_needed_hashes(self): def test_needed_hashes(self):
ht = make_tree(8) ht = make_tree(8)
@ -82,8 +84,8 @@ class Incomplete(unittest.TestCase):
iht = hashtree.IncompleteHashTree(6) iht = hashtree.IncompleteHashTree(6)
current_hashes = list(iht) current_hashes = list(iht)
# this should fail because there aren't enough hashes known
try: try:
# this should fail because there aren't enough hashes known
iht.set_hashes(leaves={0: tagged_hash("tag", "0")}) iht.set_hashes(leaves={0: tagged_hash("tag", "0")})
except hashtree.NotEnoughHashesError: except hashtree.NotEnoughHashesError:
pass pass
@ -96,14 +98,23 @@ class Incomplete(unittest.TestCase):
self.failUnlessEqual(iht.needed_hashes(0), set([8, 4, 2])) self.failUnlessEqual(iht.needed_hashes(0), set([8, 4, 2]))
chain = {0: ht[0], 2: ht[2], 4: ht[4], 8: ht[8]} chain = {0: ht[0], 2: ht[2], 4: ht[4], 8: ht[8]}
# this should fail because the leaf hash is just plain wrong
try: try:
# this should fail because the leaf hash is just plain wrong
iht.set_hashes(chain, leaves={0: tagged_hash("bad tag", "0")}) iht.set_hashes(chain, leaves={0: tagged_hash("bad tag", "0")})
except hashtree.BadHashError: except hashtree.BadHashError:
pass pass
else: else:
self.fail("didn't catch bad hash") self.fail("didn't catch bad hash")
# this should fail because we give it conflicting hashes: one as an
# internal node, another as a leaf
try:
iht.set_hashes(chain, leaves={1: tagged_hash("bad tag", "1")})
except hashtree.BadHashError:
pass
else:
self.fail("didn't catch bad hash")
bad_chain = chain.copy() bad_chain = chain.copy()
bad_chain[2] = ht[2] + "BOGUS" bad_chain[2] = ht[2] + "BOGUS"
@ -130,6 +141,15 @@ class Incomplete(unittest.TestCase):
except hashtree.BadHashError: except hashtree.BadHashError:
self.fail("bad hash") self.fail("bad hash")
# this should fail because we give it hashes that conflict with some
# that we added successfully before
try:
iht.set_hashes(leaves={1: tagged_hash("bad tag", "1")})
except hashtree.BadHashError:
pass
else:
self.fail("didn't catch bad hash")
# now that leaves 0 and 1 are known, some of the internal nodes are # now that leaves 0 and 1 are known, some of the internal nodes are
# known # known
self.failUnlessEqual(iht.needed_hashes(4), set([12, 6])) self.failUnlessEqual(iht.needed_hashes(4), set([12, 6]))