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import sqlalchemy.topological as topological
from sqlalchemy.test import TestBase
from sqlalchemy.test.testing import assert_raises
from sqlalchemy import exc
import collections
class DependencySortTest(TestBase):
def assert_sort(self, tuples, result):
deps = collections.defaultdict(set)
for parent, child in tuples:
deps[parent].add(child)
assert len(result)
for i, node in enumerate(result):
for n in result[i:]:
assert node not in deps[n]
def testsort(self):
rootnode = 'root'
node2 = 'node2'
node3 = 'node3'
node4 = 'node4'
subnode1 = 'subnode1'
subnode2 = 'subnode2'
subnode3 = 'subnode3'
subnode4 = 'subnode4'
subsubnode1 = 'subsubnode1'
tuples = [
(subnode3, subsubnode1),
(node2, subnode1),
(node2, subnode2),
(rootnode, node2),
(rootnode, node3),
(rootnode, node4),
(node4, subnode3),
(node4, subnode4)
]
self.assert_sort(tuples, topological.sort(tuples, []))
def testsort2(self):
node1 = 'node1'
node2 = 'node2'
node3 = 'node3'
node4 = 'node4'
node5 = 'node5'
node6 = 'node6'
node7 = 'node7'
tuples = [
(node1, node2),
(node3, node4),
(node4, node5),
(node5, node6),
(node6, node2)
]
self.assert_sort(tuples, topological.sort(tuples, [node7]))
def testsort4(self):
node1 = 'keywords'
node2 = 'itemkeyowrds'
node3 = 'items'
node4 = 'hoho'
tuples = [
(node1, node2),
(node4, node1),
(node1, node3),
(node3, node2)
]
self.assert_sort(tuples, topological.sort(tuples, []))
def testcircular(self):
node1 = 'node1'
node2 = 'node2'
node3 = 'node3'
node4 = 'node4'
node5 = 'node5'
tuples = [
(node4, node5),
(node5, node4),
(node1, node2),
(node2, node3),
(node3, node1),
(node4, node1)
]
allitems = [node1, node2, node3, node4]
assert_raises(exc.CircularDependencyError, topological.sort, tuples, allitems)
# TODO: test find_cycles
def testcircular2(self):
# this condition was arising from ticket:362
# and was not treated properly by topological sort
node1 = 'node1'
node2 = 'node2'
node3 = 'node3'
node4 = 'node4'
tuples = [
(node1, node2),
(node3, node1),
(node2, node4),
(node3, node2),
(node2, node3)
]
assert_raises(exc.CircularDependencyError, topological.sort, tuples, [])
# TODO: test find_cycles
def testcircular3(self):
question, issue, providerservice, answer, provider = "Question", "Issue", "ProviderService", "Answer", "Provider"
tuples = [(question, issue), (providerservice, issue), (provider, question),
(question, provider), (providerservice, question),
(provider, providerservice), (question, answer), (issue, question)]
assert_raises(exc.CircularDependencyError, topological.sort, tuples, [])
# TODO: test find_cycles
def testbigsort(self):
tuples = [(i, i + 1) for i in range(0, 1500, 2)]
self.assert_sort(
tuples,
topological.sort(tuples, [])
)
def testids(self):
# ticket:1380 regression: would raise a KeyError
tuples = [(id(i), i) for i in range(3)]
self.assert_sort(
tuples,
topological.sort(tuples, [])
)
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