pyo3/examples/pyo3-pytests/tests/test_pyclass_iter.py

import pytest
from pyo3_pytests import pyclass_iter


def test_iter():
    i = pyclass_iter.PyClassIter()
    assert next(i) == 1
    assert next(i) == 2
    assert next(i) == 3
    assert next(i) == 4
    assert next(i) == 5

    with pytest.raises(StopIteration) as excinfo:
        next(i)
    assert excinfo.value.value == "Ended"