pythonnative/tests/test_native_lists.py at v0.41.0 · pythonnative/pythonnative · GitHub

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"""Logical list ownership under native recycling requests."""

from typing import Any

import pytest

import pythonnative as pn

from pythonnative.testing import render

@pytest.fixture(autouse=True)

def native_contract(monkeypatch: pytest.MonkeyPatch) -> None:

monkeypatch.setattr(pn.components, "_native_lists_supported", lambda: True)

def test_rows_inherit_provider_and_keep_state_by_key() -> None:

theme = pn.create_context("default")

setters = {}

@pn.component

def Row(item: Any) -> pn.Element:

value, setter = pn.use_state(item["label"])

setters[item["id"]] = setter

return pn.Text(f"{item['label']}/{value}/{pn.use_context(theme)}")

def tree(data: list[dict[str, str]]) -> pn.Element:

return theme.Provider(

"inherited",

pn.FlatList(data=data, key_extractor=lambda item, _: item["id"], render_item=lambda item, _: Row(item)),

)

result = render(tree([{"id": "a", "label": "A"}, {"id": "b", "label": "B"}]))

assert result.get_by_text("A/A/inherited")

setters["a"]("edited")

result.rerender(tree([{"id": "b", "label": "B2"}, {"id": "a", "label": "A2"}]))

assert result.get_by_text("A2/edited/inherited")

assert result.get_by_text("B2/B/inherited")

def test_same_length_data_edits_advance_native_revision() -> None:

result = render(pn.FlatList(data=["a", "b"], item_height=44))

first = result.get_by_type("VirtualList").props["revision"]

result.rerender(pn.FlatList(data=["z", "b"], item_height=44))

assert result.get_by_type("VirtualList").props["revision"] > first

assert result.get_by_text("z")

def test_native_requests_are_bounded_and_stale_requests_are_ignored() -> None:

result = render(pn.FlatList(data=list(range(10_000)), item_height=44))

view = result.get_by_type("VirtualList")

revision = view.props["revision"]

assert len(result.get_all_by_type("Text")) <= 56

key = view.props["keys"][5000]

result.fire(view, "on_bind_row", {"index": 5000, "key": key, "revision": revision - 1})

assert result.query_by_text("5000") is None

result.fire(view, "on_bind_row", {"index": 5000, "key": key, "revision": revision})

assert result.get_by_text("5000")

assert len(result.get_all_by_type("Text")) <= 56

result.unmount()

assert result.backend.live_view_count() == 0

def test_rows_do_not_move_state_to_different_keys() -> None:

@pn.component

def Row(item: Any) -> pn.Element:

original, _ = pn.use_state(item)

return pn.Text(f"{item}/{original}")

result = render(pn.FlatList(data=["a"], key_extractor=lambda item, _: item, render_item=lambda item, _: Row(item)))

result.rerender(pn.FlatList(data=["b"], key_extractor=lambda item, _: item, render_item=lambda item, _: Row(item)))

assert result.get_by_text("b/b")

def test_duplicate_keys_fail_before_native_commit() -> None:

with pytest.raises(ValueError, match="unique"):

render(pn.FlatList(data=[1, 2], key_extractor=lambda *_: "duplicate"))

def test_fixed_list_height_survives_an_unbounded_scroll_parent() -> None:

result = render(

pn.ScrollView(

pn.Column(pn.FlatList(data=list(range(40)), item_height=44, style={"height": 400}), pn.Text("After"))

)

assert result.get_by_type("VirtualList").frame[3] == 400

result.unmount()

pythonnative/tests/test_native_lists.py at v0.41.0 · pythonnative/pythonnative · GitHub

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