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bzrlib/tests/test_tsort.py
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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"""Tests for topological sort.
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"""
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import os
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import sys
 
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"""Tests for topological sort."""
 
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from bzrlib.tests import TestCase
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from bzrlib.tsort import topo_sort
 
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from bzrlib.tsort import topo_sort, TopoSorter
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from bzrlib.errors import GraphCycleError
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class TopoSortTests(TestCase):
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    def assertSortAndIterate(self, graph, result_list):
 
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        """Check that sorting and iter_topo_order on graph works."""
 
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        self.assertEquals(result_list, topo_sort(graph))
 
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        self.assertEqual(result_list,
 
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                         list(TopoSorter(graph).iter_topo_order()))
 
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    def assertSortAndIterateRaise(self, exception_type, graph):
 
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        """Try both iterating and topo_sorting graph and expect an exception."""
 
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        self.assertRaises(exception_type, topo_sort, graph)
 
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        self.assertRaises(exception_type,
 
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                          list,
 
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                          TopoSorter(graph).iter_topo_order())
 
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    def test_tsort_empty(self):
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        """TopoSort empty list"""
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        self.assertEquals(topo_sort([]), [])
 
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        self.assertSortAndIterate([], [])
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    def test_tsort_easy(self):
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        """TopoSort list with one node"""
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        self.assertEquals(topo_sort({0: []}.items()),
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                          [0])
 
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        self.assertSortAndIterate({0: []}.items(), [0])
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    def test_tsort_cycle(self):
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        """TopoSort traps graph with cycles"""
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        self.assertRaises(GraphCycleError,
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                          topo_sort,
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                          {0: [1], 
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                           1: [0]}.iteritems())
 
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        self.assertSortAndIterateRaise(GraphCycleError,
 
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                                       {0: [1], 
 
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                                        1: [0]}.items())
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    def test_tsort_cycle_2(self):
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        """TopoSort traps graph with longer cycle"""
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        self.assertRaises(GraphCycleError,
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                          topo_sort,
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                          {0: [1], 
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                           1: [2], 
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                           2: [0]}.iteritems())
 
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        self.assertSortAndIterateRaise(GraphCycleError,
 
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                                       {0: [1], 
 
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                                        1: [2], 
 
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                                        2: [0]}.items())
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    def test_tsort_1(self):
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        """TopoSort simple nontrivial graph"""
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        self.assertEquals(topo_sort({0: [3], 
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                                     1: [4],
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                                     2: [1, 4],
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                                     3: [], 
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                                     4: [0, 3]}.iteritems()),
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                          [3, 0, 4, 1, 2])
 
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        self.assertSortAndIterate({0: [3], 
 
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                                   1: [4],
 
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                                   2: [1, 4],
 
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                                   3: [], 
 
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                                   4: [0, 3]}.items(),
 
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                                  [3, 0, 4, 1, 2])
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    def test_tsort_partial(self):
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        """Topological sort with partial ordering.
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        If the graph does not give an order between two nodes, they are 
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        returned in lexicographical order.
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        """
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        self.assertEquals(topo_sort([(0, []),
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                                    (1, [0]),
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                                    (2, [0]),
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                                    (3, [0]),
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                                    (4, [1, 2, 3]),
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                                    (5, [1, 2]),
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                                    (6, [1, 2]),
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                                    (7, [2, 3]),
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                                    (8, [0, 1, 4, 5, 6])]),
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                          [0, 1, 2, 3, 4, 5, 6, 7, 8, ])
 
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        self.assertSortAndIterate(([(0, []),
 
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                                   (1, [0]),
 
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                                   (2, [0]),
 
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                                   (3, [0]),
 
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                                   (4, [1, 2, 3]),
 
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                                   (5, [1, 2]),
 
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                                   (6, [1, 2]),
 
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                                   (7, [2, 3]),
 
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                                   (8, [0, 1, 4, 5, 6])]),
 
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                                  [0, 1, 2, 3, 4, 5, 6, 7, 8])