def test_with_expected_non_match():
"""Check to see that we don't always get a successful match."""
tree = NoAho()
tree.add("wise man")
tree.compile()
assert (None, None,
None) == tree.find_short("where fools and wise men fear to tread")
def test_anchored():
tree = NoAho()
tree.add(anchor(".a..b..c."))
tree.add(anchor(".b."))
tree.compile()
matches = list(tree.findall_anchored(anchor(".a..b..z.")))
assert matches == [(3, 6, None)]
def test_find_longest_with_whole_match():
"""Make sure that longest search will match the whole string."""
tree = NoAho()
longString = "supercalifragilisticexpialidocious"
tree.add(longString)
tree.compile()
assert (0, len(longString), None) == tree.find_long(longString)
def test_simple_construction():
tree = NoAho()
tree.add("foo")
tree.add("bar")
tree.compile()
(10, 13, None) == tree.find_short("this is a foo message")
tree.children_count() == 6
def test_embedded_nulls():
"""Check to see if we can accept embedded nulls"""
tree = NoAho()
tree.add("hell\0 world")
tree.compile()
assert (None, None, None) == tree.find_short("ello\0 world")
assert (0, 11, None) == tree.find_short("hell\0 world")
def test_mapped_trie_payload():
trie = NoAho()
trie.add("foo", None)
trie.compile()
with tempfile.TemporaryDirectory(prefix="noahong-") as tmpdir:
path = os.path.join(tmpdir, "mapped")
with pytest.raises(PayloadWriteError):
trie.write(path)
def test_find_longest():
tree = NoAho()
tree.add("a")
tree.add("alphabet")
tree.compile()
assert (0, 1, None) == tree.find_short("alphabet soup")
assert (0, 8, None) == tree.find_long("alphabet soup")
assert (13, 14, None) == tree.find_long(
"yummy, I see an alphabet soup bowl") # NOQA
def test_compile_before_use():
tree = NoAho()
tree.add("bar")
# Cannot be used before compilation
with pytest.raises(AssertionError):
tree.find_short("xxxbaryyy")
tree.compile()
tree.find_short("xxxbaryyy")
# Cannot add after compilation
with pytest.raises(AssertionError):
tree.add("foo")
def test_keyword_as_prefix_of_another():
"""According to John, there's a problem with the matcher.
this test case should expose the bug."""
tree = NoAho()
tree.add("foobar")
tree.add("foo")
tree.add("bar")
tree.compile()
assert (3, 6, None) == tree.find_short("xxxfooyyy")
assert (0, 3, None) == tree.find_short("foo")
assert (3, 6, None) == tree.find_short("xxxbaryyy")
def test_another_find():
"""Just to triangulate the search code. We want to make sure
that the implementation can do more than one search, at
least."""
tree = NoAho()
tree.add("Python")
tree.add("PLT Scheme")
tree.compile()
assert (19, 25, None) == tree.find_short(
"I am learning both Python and PLT Scheme") # NOQA
assert (0, 10, None) == tree.find_short(
"PLT Scheme is an interesting language.") # NOQA
def test_mapped_trie():
tree = NoAho()
tree.add(anchor(".a..b..c."), 0)
tree.add(anchor(".b."), 1)
tree.add(anchor(".a..c."), 2)
tree.add(anchor(".a..b."), 3)
tree.add(anchor(".é."), 4)
tree.compile()
with tempfile.TemporaryDirectory(prefix="noahong-") as tmpdir:
path = os.path.join(tmpdir, "mapped")
tree.write(path)
with contextlib.closing(Mapped(path)) as m:
assert m.nodes_count() == tree.nodes_count()
matches = list(m.findall_anchored(anchor(".a..b..c.")))
assert matches == [(0, 9, 0)]
matches = list(m.findall_anchored(anchor(".b.")))
assert matches == [(0, 3, 1)]
matches = list(m.findall_anchored(anchor(".a..c.")))
assert matches == [(0, 6, 2)]
matches = list(m.findall_anchored(anchor(".z.")))
assert matches == []
matches = list(m.findall_anchored(anchor(".z..a..b..z.")))
assert matches == [(3, 9, 3)]
matches = list(m.findall_anchored(anchor(".é.")))
assert matches == [(0, 3, 4)]
def test_findall_and_findall_longest():
tree = NoAho()
tree.add("python")
tree.add("perl")
tree.add("scheme")
tree.add("java")
tree.add("pythonperl")
tree.compile()
assert [
(0, 6, None),
(6, 10, None),
(10, 16, None),
(16, 20, None),
] == list( # NOQA
tree.findall_short("pythonperlschemejava"))
assert [(0, 10, None), (10, 16, None),
(16, 20, None)] == list(tree.findall_long("pythonperlschemejava"))
assert [] == list(tree.findall_short("no pascal here"))
assert [] == list(tree.findall_long("no pascal here"))
def test_bug3_false_terminal_nodes():
tree = NoAho()
tree.add("an", None)
tree.add("canal", None)
tree.add("e can oilfield", None)
tree.compile()
assert [(4, 4 + 5, None)], list(tree.findall_long("one canal"))
def test_utf8():
tree = NoAho()
tree.add("étable")
tree.add("béret")
tree.add("blé")
tree.compile()
matches = list(tree.findall_long("étable béret blé"))
assert matches == [(0, 6, None), (7, 12, None), (13, 16, None)]
def test_bug2_competing_longests():
"""Previously we'd return the /last/ key found, now we look forward
while there are contiguous candidate keys, and actually return the
longest.
"""
tree = NoAho()
tree.add("cisco", "cisco")
tree.add("em", "em")
tree.add("cisco systems australia", "cisco systems")
tree.compile()
assert [(0, 5, "cisco"),
(10, 12, "em")] == list(tree.findall_long("cisco systems")) # NOQA
def test_counts():
tree = NoAho()
tree.add("foo")
tree.compile()
assert tree.nodes_count() == 4
assert tree.children_count() == 3
tree = NoAho()
tree.add("foo")
tree.add("bar")
tree.compile()
assert tree.nodes_count() == 7
assert tree.children_count() == 6
tree = NoAho()
tree.add("fo")
tree.add("foo")
tree.compile()
assert tree.nodes_count() == 4
assert tree.children_count() == 3
def test_subset():
tree = NoAho()
tree.add("he")
tree.add("hers")
assert [(0, 2, None), (0, 4, None)] == list(tree.findall_short("hers"))
def test_iteration():
tree = NoAho()
tree.add("Harry")
tree.add("Hermione")
tree.add("Ron")
assert set("Harry", "Hermione", "Ron") == set(tree.keys())
def test_payload():
tree = NoAho()
class RandomClass(object):
def __init__(self):
pass
obj = RandomClass()
tree.add("python", "yes-python")
tree.add("perl", "")
tree.add("scheme", None)
tree.add("lisp", [1, 2, 3])
# no payload, comes out None
tree.add("C++")
tree.add("dylan", obj)
tree.compile()
assert (0, 6, "yes-python") == tree.find_short("python")
assert (0, 4, "") == tree.find_short("perl")
assert (0, 6, None) == tree.find_short("scheme")
assert (0, 4, [1, 2, 3]) == tree.find_short("lisp")
assert (0, 3, None) == tree.find_short("C++")
assert (0, 5, obj) == tree.find_short("dylan")
class AhoCorasickTest(unittest.TestCase):
def setUp(self):
self.tree = NoAho()
def tearDown(self):
self.tree = None
def test_compile_before_use(self):
self.tree.add('bar')
self.assertRaises(AssertionError,
lambda: self.tree.find_short('xxxbaryyy'))
self.tree.compile()
self.tree.find_short('xxxbaryyy')
self.assertRaises(AssertionError, lambda: self.tree.add('foo'))
def test_keyword_as_prefix_of_another(self):
"""According to John, there's a problem with the matcher.
this test case should expose the bug."""
self.tree.add('foobar')
self.tree.add('foo')
self.tree.add('bar')
self.tree.compile()
self.assertEqual((3, 6, None), self.tree.find_short('xxxfooyyy'))
self.assertEqual((0, 3, None), self.tree.find_short('foo'))
self.assertEqual((3, 6, None), self.tree.find_short('xxxbaryyy'))
def test_another_find(self):
"""Just to triangulate the search code. We want to make sure
that the implementation can do more than one search, at
least."""
self.tree.add("Python")
self.tree.add("PLT Scheme")
self.tree.compile()
self.assertEqual((19, 25, None), self.tree.find_short(
"I am learning both Python and PLT Scheme"))
self.assertEqual((0, 10, None), self.tree.find_short(
"PLT Scheme is an interesting language."))
def test_simple_construction(self):
self.tree.add("foo")
self.tree.add("bar")
self.tree.compile()
self.assertEqual((10, 13, None),
self.tree.find_short("this is a foo message"))
self.assertEqual(self.tree.children_count(), 6)
def test_counts(self):
self.tree = NoAho()
self.tree.add("foo")
self.tree.compile()
self.assertEqual(self.tree.nodes_count(), 4)
self.assertEqual(self.tree.children_count(), 3)
self.tree = NoAho()
self.tree.add("foo")
self.tree.add("bar")
self.tree.compile()
self.assertEqual(self.tree.nodes_count(), 7)
self.assertEqual(self.tree.children_count(), 6)
self.tree = NoAho()
self.tree.add("fo")
self.tree.add("foo")
self.tree.compile()
self.assertEqual(self.tree.nodes_count(), 4)
self.assertEqual(self.tree.children_count(), 3)
def test_find_longest(self):
self.tree.add("a")
self.tree.add("alphabet")
self.tree.compile()
self.assertEqual((0, 1, None), self.tree.find_short("alphabet soup"))
self.assertEqual((0, 8, None), self.tree.find_long("alphabet soup"))
self.assertEqual((13, 14, None), self.tree.find_long(
"yummy, I see an alphabet soup bowl"))
def test_find_with_whole_match(self):
"""Make sure that longest search will match the whole string."""
longString = "supercalifragilisticexpialidocious"
self.tree.add(longString)
self.tree.compile()
self.assertEqual((0, len(longString), None),
self.tree.find_short(longString))
def test_find_longest_with_whole_match(self):
"""Make sure that longest search will match the whole string."""
longString = "supercalifragilisticexpialidocious"
self.tree.add(longString)
self.tree.compile()
self.assertEqual((0, len(longString), None),
self.tree.find_long(longString))
def test_find_longest_with_no_match(self):
self.tree.add("foobar")
self.tree.compile()
self.assertEqual((None, None, None), self.tree.find_long("fooba"))
def test_with_expected_non_match(self):
"""Check to see that we don't always get a successful match."""
self.tree.add("wise man")
self.tree.compile()
self.assertEqual((None, None, None), self.tree.find_short(
"where fools and wise men fear to tread"))
def test_reject_empty_key(self):
self.assertRaises(ValueError, self.tree.add, "")
def test_empty_construction(self):
"""Make sure that we can safely construct and dealloc a tree
with no initial keywords. Important because the C
implementation assumes keywords exist on its dealloc, so we
have to do some work on the back end to avoid silly segmentation
errors."""
tree = NoAho()
del tree
def test_embedded_nulls(self):
"""Check to see if we can accept embedded nulls"""
self.tree.add("hell\0 world")
self.tree.compile()
self.assertEqual((None, None, None),
self.tree.find_short("ello\0 world"))
self.assertEqual((0, 11, None), self.tree.find_short("hell\0 world"))
def test_embedded_nulls_again(self):
self.tree.add("\0\0\0")
self.tree.compile()
self.assertEqual((0, 3, None),
self.tree.find_short("\0\0\0\0\0\0\0\0"))
def test_findall_and_findall_longest(self):
self.tree.add("python")
self.tree.add("perl")
self.tree.add("scheme")
self.tree.add("java")
self.tree.add("pythonperl")
self.tree.compile()
self.assertEqual(
[(0, 6, None), (6, 10, None), (10, 16, None), (16, 20, None)],
list(self.tree.findall_short("pythonperlschemejava")))
self.assertEqual([(0, 10, None), (10, 16, None), (16, 20, None)],
list(self.tree.findall_long("pythonperlschemejava")))
self.assertEqual([],
list(self.tree.findall_short("no pascal here")))
self.assertEqual([],
list(self.tree.findall_long("no pascal here")))
def test_bug2_competing_longests(self):
"""Previously we'd return the /last/ key found, now we look forward
while there are contiguous candidate keys, and actually return the
longest.
"""
self.tree.add('cisco', 'cisco')
self.tree.add('em', 'em')
self.tree.add('cisco systems australia', 'cisco systems')
self.tree.compile()
self.assertEqual([(0, 5, 'cisco'), (10, 12, 'em')],
list(self.tree.findall_long('cisco systems')))
def test_bug3_false_terminal_nodes(self):
self.tree.add('an', None)
self.tree.add('canal', None)
self.tree.add('e can oilfield', None)
self.tree.compile()
self.assertEqual([(4, 4+5, None)],
list(self.tree.findall_long('one canal')))
def test_payload(self):
class RandomClass(object):
def __init__(self):
pass
obj = RandomClass()
self.tree.add("python", "yes-python")
self.tree.add("perl", "")
self.tree.add("scheme", None)
self.tree.add("lisp", [1, 2, 3])
# no payload, comes out None
self.tree.add("C++")
self.tree.add("dylan", obj)
self.tree.compile()
self.assertEqual((0, 6, "yes-python"), self.tree.find_short("python"))
self.assertEqual((0, 4, ""), self.tree.find_short("perl"))
self.assertEqual((0, 6, None), self.tree.find_short("scheme"))
self.assertEqual((0, 4, [1, 2, 3]), self.tree.find_short("lisp"))
self.assertEqual((0, 3, None), self.tree.find_short("C++"))
self.assertEqual((0, 5, obj), self.tree.find_short("dylan"))
def test_dict_style_get_and_set(self):
self.tree['foo'] = 5
self.tree.compile()
self.assertEqual(5, self.tree['foo'])
def test_dict_style_set_empty_key(self):
# equivalent to self.tree[''] = None
# __setitem__ implements this part of the [] protocol
self.assertRaises(ValueError, self.tree.__setitem__, '', None)
def test_dict_style_set_nonstring_key(self):
# equivalent to self.tree[''] = None
# __setitem__ implements this part of the [] protocol
self.assertRaises(ValueError, self.tree.__setitem__, 6, None)
self.assertRaises(ValueError, self.tree.__setitem__, None, None)
self.assertRaises(ValueError, self.tree.__setitem__, [], None)
def test_dict_style_get_unseen_key(self):
# __getitem__ implements this part of the [] protocol
self.tree.compile()
self.assertRaises(KeyError, self.tree.__getitem__, 'unseen')
self.assertRaises(KeyError, self.tree.__getitem__, '')
def test_dict_style_containment(self):
self.tree['foo'] = 5
self.tree.compile()
self.assertEqual(True, 'foo' in self.tree)
self.assertEqual(False, '' in self.tree)
self.assertEqual(False, 'fo' in self.tree)
self.assertEqual(False, 'o' in self.tree)
self.assertEqual(False, 'oo' in self.tree)
self.assertEqual(False, 'f' in self.tree)
def test_dict_style_len(self):
self.tree['a'] = None
self.tree['b'] = [1, 2]
self.tree['c'] = 12
self.tree.compile()
self.assertEqual(3, len(self.tree))
# reminder that we need to figure out which version we're in, and
# test Python 2 unicode explicitly
@unittest.expectedFailure
def test_unicode_in_python2(self):
self.assertEqual(True, False)
# key iteration is unimplemented
@unittest.expectedFailure
def test_iteration(self):
self.tree.add("Harry")
self.tree.add("Hermione")
self.tree.add("Ron")
self.assertEqual(set("Harry", "Hermione", "Ron"),
set(self.tree.keys()))
# reminder that we need to implement findall_short
@unittest.expectedFailure
def test_subset(self):
self.tree.add("he")
self.tree.add("hers")
self.assertEqual([(0, 2, None), (0, 4, None)],
list(self.tree.findall_short("hers")))
def test_find_longest_with_no_match():
tree = NoAho()
tree.add("foobar")
tree.compile()
assert (None, None, None) == tree.find_long("fooba")
def test_reject_empty_key():
tree = NoAho()
with pytest.raises(ValueError):
tree.add("")
def test_embedded_nulls_again():
tree = NoAho()
tree.add("\0\0\0")
tree.compile()
assert (0, 3, None) == tree.find_short("\0\0\0\0\0\0\0\0")
class AhoCorasickTest(unittest.TestCase):
def setUp(self):
self.tree = NoAho()
def tearDown(self):
self.tree = None
def test_compile_before_use(self):
self.tree.add('bar')
self.assertRaises(AssertionError,
lambda: self.tree.find_short('xxxbaryyy'))
self.tree.compile()
self.tree.find_short('xxxbaryyy')
self.assertRaises(AssertionError, lambda: self.tree.add('foo'))
def test_keyword_as_prefix_of_another(self):
"""According to John, there's a problem with the matcher.
this test case should expose the bug."""
self.tree.add('foobar')
self.tree.add('foo')
self.tree.add('bar')
self.tree.compile()
self.assertEqual((3, 6, None), self.tree.find_short('xxxfooyyy'))
self.assertEqual((0, 3, None), self.tree.find_short('foo'))
self.assertEqual((3, 6, None), self.tree.find_short('xxxbaryyy'))
def test_another_find(self):
"""Just to triangulate the search code. We want to make sure
that the implementation can do more than one search, at
least."""
self.tree.add("Python")
self.tree.add("PLT Scheme")
self.tree.compile()
self.assertEqual(
(19, 25, None),
self.tree.find_short("I am learning both Python and PLT Scheme"))
self.assertEqual(
(0, 10, None),
self.tree.find_short("PLT Scheme is an interesting language."))
def test_simple_construction(self):
self.tree.add("foo")
self.tree.add("bar")
self.tree.compile()
self.assertEqual((10, 13, None),
self.tree.find_short("this is a foo message"))
self.assertEqual(self.tree.children_count(), 6)
def test_counts(self):
self.tree = NoAho()
self.tree.add("foo")
self.tree.compile()
self.assertEqual(self.tree.nodes_count(), 4)
self.assertEqual(self.tree.children_count(), 3)
self.tree = NoAho()
self.tree.add("foo")
self.tree.add("bar")
self.tree.compile()
self.assertEqual(self.tree.nodes_count(), 7)
self.assertEqual(self.tree.children_count(), 6)
self.tree = NoAho()
self.tree.add("fo")
self.tree.add("foo")
self.tree.compile()
self.assertEqual(self.tree.nodes_count(), 4)
self.assertEqual(self.tree.children_count(), 3)
def test_find_longest(self):
self.tree.add("a")
self.tree.add("alphabet")
self.tree.compile()
self.assertEqual((0, 1, None), self.tree.find_short("alphabet soup"))
self.assertEqual((0, 8, None), self.tree.find_long("alphabet soup"))
self.assertEqual(
(13, 14, None),
self.tree.find_long("yummy, I see an alphabet soup bowl"))
def test_find_with_whole_match(self):
"""Make sure that longest search will match the whole string."""
longString = "supercalifragilisticexpialidocious"
self.tree.add(longString)
self.tree.compile()
self.assertEqual((0, len(longString), None),
self.tree.find_short(longString))
def test_find_longest_with_whole_match(self):
"""Make sure that longest search will match the whole string."""
longString = "supercalifragilisticexpialidocious"
self.tree.add(longString)
self.tree.compile()
self.assertEqual((0, len(longString), None),
self.tree.find_long(longString))
def test_find_longest_with_no_match(self):
self.tree.add("foobar")
self.tree.compile()
self.assertEqual((None, None, None), self.tree.find_long("fooba"))
def test_with_expected_non_match(self):
"""Check to see that we don't always get a successful match."""
self.tree.add("wise man")
self.tree.compile()
self.assertEqual(
(None, None, None),
self.tree.find_short("where fools and wise men fear to tread"))
def test_reject_empty_key(self):
self.assertRaises(ValueError, self.tree.add, "")
def test_empty_construction(self):
"""Make sure that we can safely construct and dealloc a tree
with no initial keywords. Important because the C
implementation assumes keywords exist on its dealloc, so we
have to do some work on the back end to avoid silly segmentation
errors."""
tree = NoAho()
del tree
def test_embedded_nulls(self):
"""Check to see if we can accept embedded nulls"""
self.tree.add("hell\0 world")
self.tree.compile()
self.assertEqual((None, None, None),
self.tree.find_short("ello\0 world"))
self.assertEqual((0, 11, None), self.tree.find_short("hell\0 world"))
def test_embedded_nulls_again(self):
self.tree.add("\0\0\0")
self.tree.compile()
self.assertEqual((0, 3, None),
self.tree.find_short("\0\0\0\0\0\0\0\0"))
def test_findall_and_findall_longest(self):
self.tree.add("python")
self.tree.add("perl")
self.tree.add("scheme")
self.tree.add("java")
self.tree.add("pythonperl")
self.tree.compile()
self.assertEqual([(0, 6, None), (6, 10, None), (10, 16, None),
(16, 20, None)],
list(self.tree.findall_short("pythonperlschemejava")))
self.assertEqual([(0, 10, None), (10, 16, None), (16, 20, None)],
list(self.tree.findall_long("pythonperlschemejava")))
self.assertEqual([], list(self.tree.findall_short("no pascal here")))
self.assertEqual([], list(self.tree.findall_long("no pascal here")))
def test_bug2_competing_longests(self):
"""Previously we'd return the /last/ key found, now we look forward
while there are contiguous candidate keys, and actually return the
longest.
"""
self.tree.add('cisco', 'cisco')
self.tree.add('em', 'em')
self.tree.add('cisco systems australia', 'cisco systems')
self.tree.compile()
self.assertEqual([(0, 5, 'cisco'), (10, 12, 'em')],
list(self.tree.findall_long('cisco systems')))
def test_bug3_false_terminal_nodes(self):
self.tree.add('an', None)
self.tree.add('canal', None)
self.tree.add('e can oilfield', None)
self.tree.compile()
self.assertEqual([(4, 4 + 5, None)],
list(self.tree.findall_long('one canal')))
def test_payload(self):
class RandomClass(object):
def __init__(self):
pass
obj = RandomClass()
self.tree.add("python", "yes-python")
self.tree.add("perl", "")
self.tree.add("scheme", None)
self.tree.add("lisp", [1, 2, 3])
# no payload, comes out None
self.tree.add("C++")
self.tree.add("dylan", obj)
self.tree.compile()
self.assertEqual((0, 6, "yes-python"), self.tree.find_short("python"))
self.assertEqual((0, 4, ""), self.tree.find_short("perl"))
self.assertEqual((0, 6, None), self.tree.find_short("scheme"))
self.assertEqual((0, 4, [1, 2, 3]), self.tree.find_short("lisp"))
self.assertEqual((0, 3, None), self.tree.find_short("C++"))
self.assertEqual((0, 5, obj), self.tree.find_short("dylan"))
def test_dict_style_get_and_set(self):
self.tree['foo'] = 5
self.tree.compile()
self.assertEqual(5, self.tree['foo'])
def test_dict_style_set_empty_key(self):
# equivalent to self.tree[''] = None
# __setitem__ implements this part of the [] protocol
self.assertRaises(ValueError, self.tree.__setitem__, '', None)
def test_dict_style_set_nonstring_key(self):
# equivalent to self.tree[''] = None
# __setitem__ implements this part of the [] protocol
self.assertRaises(ValueError, self.tree.__setitem__, 6, None)
self.assertRaises(ValueError, self.tree.__setitem__, None, None)
self.assertRaises(ValueError, self.tree.__setitem__, [], None)
def test_dict_style_get_unseen_key(self):
# __getitem__ implements this part of the [] protocol
self.tree.compile()
self.assertRaises(KeyError, self.tree.__getitem__, 'unseen')
self.assertRaises(KeyError, self.tree.__getitem__, '')
def test_dict_style_containment(self):
self.tree['foo'] = 5
self.tree.compile()
self.assertEqual(True, 'foo' in self.tree)
self.assertEqual(False, '' in self.tree)
self.assertEqual(False, 'fo' in self.tree)
self.assertEqual(False, 'o' in self.tree)
self.assertEqual(False, 'oo' in self.tree)
self.assertEqual(False, 'f' in self.tree)
def test_dict_style_len(self):
self.tree['a'] = None
self.tree['b'] = [1, 2]
self.tree['c'] = 12
self.tree.compile()
self.assertEqual(3, len(self.tree))
# reminder that we need to figure out which version we're in, and
# test Python 2 unicode explicitly
@unittest.expectedFailure
def test_unicode_in_python2(self):
self.assertEqual(True, False)
# key iteration is unimplemented
@unittest.expectedFailure
def test_iteration(self):
self.tree.add("Harry")
self.tree.add("Hermione")
self.tree.add("Ron")
self.assertEqual(set("Harry", "Hermione", "Ron"),
set(self.tree.keys()))
# reminder that we need to implement findall_short
@unittest.expectedFailure
def test_subset(self):
self.tree.add("he")
self.tree.add("hers")
self.assertEqual([(0, 2, None), (0, 4, None)],
list(self.tree.findall_short("hers")))