def test_difference_update_nonexistent(self):
versions = Versions()
versions.add('1.0')
versions.add('2.0')
versions.add('3.0', aliases=['latest'])
with self.assertRaises(KeyError):
versions.difference_update(['1.0', 'latest', '4.0'])
self.assertEqual(list(versions), [
VersionInfo('3.0', aliases=['latest']),
VersionInfo('2.0'),
VersionInfo('1.0'),
])
def test_difference_update(self):
versions = Versions()
versions.add('1.0')
versions.add('2.0')
versions.add('3.0', aliases=['latest'])
v = versions.difference_update(['1.0', '2.0', 'latest'])
self.assertEqual(v, [VersionInfo('1.0'), VersionInfo('2.0'), 'latest'])
self.assertEqual(list(versions), [
VersionInfo('3.0'),
])