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# Copyright (C) 2005 by Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Tests for topological sort."""
from bzrlib.tests import TestCase
from bzrlib.tsort import topo_sort, TopoSorter, MergeSorter, merge_sort
from bzrlib.errors import GraphCycleError
class TopoSortTests(TestCase):
def assertSortAndIterate(self, graph, result_list):
"""Check that sorting and iter_topo_order on graph works."""
self.assertEquals(result_list, topo_sort(graph))
self.assertEqual(result_list,
list(TopoSorter(graph).iter_topo_order()))
def assertSortAndIterateRaise(self, exception_type, graph):
"""Try both iterating and topo_sorting graph and expect an exception."""
self.assertRaises(exception_type, topo_sort, graph)
self.assertRaises(exception_type,
list,
TopoSorter(graph).iter_topo_order())
def test_tsort_empty(self):
"""TopoSort empty list"""
self.assertSortAndIterate([], [])
def test_tsort_easy(self):
"""TopoSort list with one node"""
self.assertSortAndIterate({0: []}.items(), [0])
def test_tsort_cycle(self):
"""TopoSort traps graph with cycles"""
self.assertSortAndIterateRaise(GraphCycleError,
{0: [1],
1: [0]}.items())
def test_tsort_cycle_2(self):
"""TopoSort traps graph with longer cycle"""
self.assertSortAndIterateRaise(GraphCycleError,
{0: [1],
1: [2],
2: [0]}.items())
def test_tsort_1(self):
"""TopoSort simple nontrivial graph"""
self.assertSortAndIterate({0: [3],
1: [4],
2: [1, 4],
3: [],
4: [0, 3]}.items(),
[3, 0, 4, 1, 2])
def test_tsort_partial(self):
"""Topological sort with partial ordering.
If the graph does not give an order between two nodes, they are
returned in lexicographical order.
"""
self.assertSortAndIterate(([(0, []),
(1, [0]),
(2, [0]),
(3, [0]),
(4, [1, 2, 3]),
(5, [1, 2]),
(6, [1, 2]),
(7, [2, 3]),
(8, [0, 1, 4, 5, 6])]),
[0, 1, 2, 3, 4, 5, 6, 7, 8])
class MergeSortTests(TestCase):
def assertSortAndIterate(self, graph, branch_tip, result_list,
mainline_revisions=None):
"""Check that merge based sorting and iter_topo_order on graph works."""
self.assertEquals(result_list,
merge_sort(graph, branch_tip, mainline_revisions=mainline_revisions))
self.assertEqual(result_list,
list(MergeSorter(
graph,
branch_tip,
mainline_revisions=mainline_revisions).iter_topo_order()))
def test_merge_sort_empty(self):
# sorting of an emptygraph does not error
self.assertSortAndIterate({}, None, [])
def test_merge_sort_not_empty_no_tip(self):
# merge sorting of a branch starting with None should result
# in an empty list: no revisions are dragged in.
self.assertSortAndIterate({0: []}.items(), None, [])
def test_merge_sort_one_revision(self):
# sorting with one revision as the tip returns the correct fields:
# sequence - 0, revision id, merge depth - 0, end_of_merge
self.assertSortAndIterate({'id': []}.items(),
'id',
[(0, 'id', 0, True)])
def test_sequence_numbers_increase_no_merges(self):
# emit a few revisions with no merges to check the sequence
# numbering works in trivial cases
self.assertSortAndIterate(
{'A': [],
'B': ['A'],
'C': ['B']}.items(),
'C',
[(0, 'C', 0, False),
(1, 'B', 0, False),
(2, 'A', 0, True),
]
)
def test_sequence_numbers_increase_with_merges(self):
# test that sequence numbers increase across merges
self.assertSortAndIterate(
{'A': [],
'B': ['A'],
'C': ['A', 'B']}.items(),
'C',
[(0, 'C', 0, False),
(1, 'B', 1, True),
(2, 'A', 0, True),
]
)
def test_merge_depth_with_nested_merges(self):
# the merge depth marker should reflect the depth of the revision
# in terms of merges out from the mainline
# revid, depth, parents:
# A 0 [D, B]
# B 1 [C, F]
# C 1 [H]
# D 0 [H, E]
# E 1 [G, F]
# F 2 [G]
# G 1 [H]
# H 0
self.assertSortAndIterate(
{'A': ['D', 'B'],
'B': ['C', 'F'],
'C': ['H'],
'D': ['H', 'E'],
'E': ['G', 'F'],
'F': ['G'],
'G': ['H'],
'H': []
}.items(),
'A',
[(0, 'A', 0, False),
(1, 'B', 1, False),
(2, 'C', 1, True),
(3, 'D', 0, False),
(4, 'E', 1, False),
(5, 'F', 2, True),
(6, 'G', 1, True),
(7, 'H', 0, True),
]
)
def test_end_of_merge_not_last_revision_in_branch(self):
# within a branch only the last revision gets an
# end of merge marker.
self.assertSortAndIterate(
{'A': ['B'],
'B': [],
},
'A',
[(0, 'A', 0, False),
(1, 'B', 0, True)
]
)
def test_end_of_merge_multiple_revisions_merged_at_once(self):
# when multiple branches are merged at once, both of their
# branch-endpoints should be listed as end-of-merge.
# Also, the order of the multiple merges should be
# left-right shown top to bottom.
# * means end of merge
# A 0 [H, B, E]
# B 1 [D, C]
# C 2 [D] *
# D 1 [H] *
# E 1 [G, F]
# F 2 [G] *
# G 1 [H] *
# H 0 [] *
self.assertSortAndIterate(
{'A': ['H', 'B', 'E'],
'B': ['D', 'C'],
'C': ['D'],
'D': ['H'],
'E': ['G', 'F'],
'F': ['G'],
'G': ['H'],
'H': [],
},
'A',
[(0, 'A', 0, False),
(1, 'B', 1, False),
(2, 'C', 2, True),
(3, 'D', 1, True),
(4, 'E', 1, False),
(5, 'F', 2, True),
(6, 'G', 1, True),
(7, 'H', 0, True),
]
)
def test_mainline_revs_partial(self):
# when a mainline_revisions list is passed this must
# override the graphs idea of mainline, and must also
# truncate the output to the specified range, if needed.
# so we test both at once: a mainline_revisions list that
# disagrees with the graph about which revs are 'mainline'
# and also truncates the output.
# graph:
# A 0 [E, B]
# B 1 [D, C]
# C 2 [D]
# D 1 [E]
# E 0
# with a mainline of NONE,E,A (the inferred one) this will show the merge
# depths above.
# with a overriden mainline of NONE,E,D,B,A it should show:
# A 0
# B 0
# C 1
# D 0
# E 0
# and thus when truncated to D,B,A it should show
# A 0
# B 0
# C 1
# because C is brought in by B in this view and D
# is the terminating revision id
self.assertSortAndIterate(
{'A': ['E', 'B'],
'B': ['D', 'C'],
'C': ['D'],
'D': ['E'],
'E': []
},
'A',
[(0, 'A', 0, False),
(1, 'B', 0, False),
(2, 'C', 1, True),
],
mainline_revisions=['D', 'B', 'A']
)
def test_mainline_revs_with_none(self):
# a simple test to ensure that a mainline_revs
# list which goes all the way to None works
self.assertSortAndIterate(
{'A': [],
},
'A',
[(0, 'A', 0, True),
],
mainline_revisions=[None, 'A']
)
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