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from typing import Sequence
import pytest
from textual._immutable_sequence_view import ImmutableSequenceView
def wrap(source: Sequence[int]) -> ImmutableSequenceView[int]:
"""Wrap a sequence of integers inside an immutable sequence view."""
return ImmutableSequenceView[int](source)
def test_empty_immutable_sequence() -> None:
"""An empty immutable sequence should act as anticipated."""
assert len(wrap([])) == 0
assert bool(wrap([])) is False
assert list(wrap([])) == []
def test_non_empty_immutable_sequence() -> None:
"""A non-empty immutable sequence should act as anticipated."""
assert len(wrap([0])) == 1
assert bool(wrap([0])) is True
assert list(wrap([0])) == [0]
def test_no_assign_to_immutable_sequence() -> None:
"""It should not be possible to assign into an immutable sequence."""
tester = wrap([1, 2, 3, 4, 5])
with pytest.raises(TypeError):
tester[0] = 23
with pytest.raises(TypeError):
tester[0:3] = 23
def test_no_del_from_iummutable_sequence() -> None:
"""It should not be possible delete an item from an immutable sequence."""
tester = wrap([1, 2, 3, 4, 5])
with pytest.raises(TypeError):
del tester[0]
def test_get_item_from_immutable_sequence() -> None:
"""It should be possible to get an item from an immutable sequence."""
assert wrap(range(10))[0] == 0
assert wrap(range(10))[-1] == 9
def test_get_slice_from_immutable_sequence() -> None:
"""It should be possible to get a slice from an immutable sequence."""
assert list(wrap(range(10))[0:2]) == [0, 1]
assert list(wrap(range(10))[0:-1]) == [0, 1, 2, 3, 4, 5, 6, 7, 8]
def test_immutable_sequence_contains() -> None:
"""It should be possible to see if an immutable sequence contains a value."""
tester = wrap([1, 2, 3, 4, 5])
assert 1 in tester
assert 11 not in tester
def test_immutable_sequence_index() -> None:
tester = wrap([1, 2, 3, 4, 5])
assert tester.index(1) == 0
with pytest.raises(ValueError):
_ = tester.index(11)
def test_reverse_immutable_sequence() -> None:
assert list(reversed(wrap([1, 2]))) == [2, 1]
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