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

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"""Tests for the reconciler's ``ref`` prop support."""

from __future__ import annotations

from typing import Any, Dict

from pythonnative.component import component

from pythonnative.element import Element

from pythonnative.hooks import Ref, use_ref

from pythonnative.reconciler import Reconciler

from pythonnative.testing import FakeBackend as MockBackend

from pythonnative.testing import FakeView as MockView

def test_ref_populated_on_mount() -> None:

ref: Ref[Any] = Ref()

el = Element("Text", {"text": "hi", "ref": ref}, [])

backend = MockBackend()

Reconciler(backend).mount(el)

assert ref.current is not None

assert isinstance(ref.current, MockView)

assert ref.current.type_name == "Text"

assert ref._pn_tag is not None

def test_ref_not_passed_to_backend() -> None:

ref: Ref[Any] = Ref()

el = Element("Text", {"text": "hi", "ref": ref}, [])

backend = MockBackend()

Reconciler(backend).mount(el)

assert "ref" not in backend.last_create_props

def test_ref_cleared_on_unmount() -> None:

ref: Ref[Any] = Ref()

el = Element("Text", {"text": "hi", "ref": ref}, [])

backend = MockBackend()

rec = Reconciler(backend)

rec.mount(el)

assert ref.current is not None

# Replace with a different element type; destroys the old tree.

rec.reconcile(Element("Button", {"title": "ok"}, []))

assert ref.current is None

def test_ref_repointed_when_ref_swapped() -> None:

"""Swapping the ref on update should populate the new and clear the old."""

old_ref: Ref[Any] = Ref()

new_ref: Ref[Any] = Ref()

backend = MockBackend()

rec = Reconciler(backend)

rec.mount(Element("Text", {"text": "a", "ref": old_ref}, []))

assert old_ref.current is not None

first_view = old_ref.current

rec.reconcile(Element("Text", {"text": "a", "ref": new_ref}, []))

assert old_ref.current is None

assert new_ref.current is first_view

def test_ref_ignored_when_not_a_ref() -> None:

"""Non-``Ref`` values under ``ref`` are silently ignored, no crashes."""

el = Element("Text", {"text": "hi", "ref": "not-a-ref"}, [])

backend = MockBackend()

Reconciler(backend).mount(el)

def test_ref_diff_does_not_trigger_native_update() -> None:

"""Changing only the ref identity should NOT call update_view."""

backend = MockBackend()

rec = Reconciler(backend)

ref_a: Ref[Any] = Ref()

ref_b: Ref[Any] = Ref()

rec.mount(Element("Text", {"text": "x", "ref": ref_a}, []))

backend.last_update_changes = {}

rec.reconcile(Element("Text", {"text": "x", "ref": ref_b}, []))

assert backend.last_update_changes == {}

assert ref_a.current is None

assert ref_b.current is not None

def test_use_ref_in_component_populated_after_mount() -> None:

captured: Dict[str, Any] = {}

@component

def Comp() -> Element:

ref = use_ref(None)

captured["ref"] = ref

return Element("Text", {"text": "hi", "ref": ref}, [])

Reconciler(MockBackend()).mount(Comp())

ref = captured["ref"]

assert ref.current is not None

assert isinstance(ref.current, MockView)

def test_ref_frame_mirrored_after_layout() -> None:

"""The layout pass mirrors the committed frame onto ``ref._pn_frame``."""

ref: Ref[Any] = Ref()

backend = MockBackend()

rec = Reconciler(backend)

child = Element("View", {"ref": ref, "height": 40}, [])

rec.mount(Element("View", {}, [child]))

rec.set_viewport_size(200.0, 100.0)

assert ref._pn_frame is not None

_x, _y, w, h = ref._pn_frame

assert (w, h) == (200.0, 40.0)

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

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