def testDifference_Disjoint(self):
a = SourceSet(set(['a', 'b']), set([SourceListCondition('1', '2', '3')]))
b = SourceSet(set(['c', 'd']), set([SourceListCondition('3', '4', '6')]))
c = a.Difference(b)
self.assertEqual(c.sources, set(['a', 'b']))
self.assertEqual(c.conditions, set())
self.assertTrue(c.IsEmpty())
def testDifference_Overlap(self):
a = SourceSet(set(['a', 'b']), set([SourceListCondition('1', '2', '5')]))
b = SourceSet(set(['b', 'c', 'd']),
set([SourceListCondition('1', '2', '5'),
SourceListCondition('3', '4', '6')]))
c = a.Difference(b)
self.assertEqual(c.sources, set(['a']))
self.assertEqual(c.conditions, set([SourceListCondition('1', '2', '5')]))
self.assertFalse(c.IsEmpty())