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#!/usr/bin/env python
# Copyright 2013 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Unit tests for the input.py file."""
import gyp.input
import unittest
import sys
class TestFindCycles(unittest.TestCase):
def setUp(self):
self.nodes = {}
for x in ('a', 'b', 'c', 'd', 'e'):
self.nodes[x] = gyp.input.DependencyGraphNode(x)
def _create_dependency(self, dependent, dependency):
dependent.dependencies.append(dependency)
dependency.dependents.append(dependent)
def test_no_cycle_empty_graph(self):
for label, node in self.nodes.items():
self.assertEqual([], node.FindCycles())
def test_no_cycle_line(self):
self._create_dependency(self.nodes['a'], self.nodes['b'])
self._create_dependency(self.nodes['b'], self.nodes['c'])
self._create_dependency(self.nodes['c'], self.nodes['d'])
for label, node in self.nodes.items():
self.assertEqual([], node.FindCycles())
def test_no_cycle_dag(self):
self._create_dependency(self.nodes['a'], self.nodes['b'])
self._create_dependency(self.nodes['a'], self.nodes['c'])
self._create_dependency(self.nodes['b'], self.nodes['c'])
for label, node in self.nodes.items():
self.assertEqual([], node.FindCycles())
def test_cycle_self_reference(self):
self._create_dependency(self.nodes['a'], self.nodes['a'])
self.assertEqual([[self.nodes['a'], self.nodes['a']]],
self.nodes['a'].FindCycles())
def test_cycle_two_nodes(self):
self._create_dependency(self.nodes['a'], self.nodes['b'])
self._create_dependency(self.nodes['b'], self.nodes['a'])
self.assertEqual([[self.nodes['a'], self.nodes['b'], self.nodes['a']]],
self.nodes['a'].FindCycles())
self.assertEqual([[self.nodes['b'], self.nodes['a'], self.nodes['b']]],
self.nodes['b'].FindCycles())
def test_two_cycles(self):
self._create_dependency(self.nodes['a'], self.nodes['b'])
self._create_dependency(self.nodes['b'], self.nodes['a'])
self._create_dependency(self.nodes['b'], self.nodes['c'])
self._create_dependency(self.nodes['c'], self.nodes['b'])
cycles = self.nodes['a'].FindCycles()
self.assertTrue(
[self.nodes['a'], self.nodes['b'], self.nodes['a']] in cycles)
self.assertTrue(
[self.nodes['b'], self.nodes['c'], self.nodes['b']] in cycles)
self.assertEqual(2, len(cycles))
def test_big_cycle(self):
self._create_dependency(self.nodes['a'], self.nodes['b'])
self._create_dependency(self.nodes['b'], self.nodes['c'])
self._create_dependency(self.nodes['c'], self.nodes['d'])
self._create_dependency(self.nodes['d'], self.nodes['e'])
self._create_dependency(self.nodes['e'], self.nodes['a'])
self.assertEqual([[self.nodes['a'],
self.nodes['b'],
self.nodes['c'],
self.nodes['d'],
self.nodes['e'],
self.nodes['a']]],
self.nodes['a'].FindCycles())
if __name__ == '__main__':
unittest.main()