def _test_invariants(self, range_set: RangeSet[int]):
self.assertEqual(len(range_set.as_ranges()) == 0, range_set.is_empty())
as_ranges: Sequence[Range[int]] = tuple(range_set.as_ranges())
# test that connected ranges are coalesced
for (range_1, range_2) in tile_with_pairs(as_ranges):
self.assertFalse(range_1.is_connected(range_2))
for rng in as_ranges:
self.assertFalse(rng.is_empty())
# test that the RangeSet's span is the span of all the ranges
if as_ranges:
self.assertEqual(Range.create_spanning(range_set.as_ranges()),
range_set.span)
else:
with self.assertRaises(ValueError):
# pylint: disable=pointless-statement
# noinspection PyStatementEffect
range_set.span
def test_create_spanning(self) -> None:
with self.assertRaisesRegex(
ValueError,
"Cannot create range from span of empty range collection"):
Range.create_spanning([])