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"""Tests for the core-semantics overhaul: multi-child rendering, effect

phases, reactive context, portals, error boundary v2, back handlers, and

dev-mode diagnostics (hook order, style keys, warnings)."""

from __future__ import annotations

from typing import Any, Dict, List, Tuple

import pytest

from pythonnative import diagnostics

from pythonnative.component import component, memo

from pythonnative.components import (

ErrorBoundary,

Fragment,

Portal,

Text,

)

from pythonnative.element import Element

from pythonnative.hooks import (

Ref,

create_context,

use_back_handler,

use_context,

use_effect,

use_imperative_handle,

use_layout_effect,

use_ref,

use_state,

)

from pythonnative.reconciler import Reconciler

from pythonnative.testing import FakeBackend as MockBackend

def _make_reconciler() -> Tuple[Reconciler, MockBackend]:

backend = MockBackend()

rec = Reconciler(backend)

rec.on_render_requested = lambda: None

return rec, backend

@pytest.fixture()

def dev_mode() -> Any:

"""Enable dev diagnostics for one test and reset state afterwards."""

diagnostics.set_dev_mode(True)

diagnostics.clear_warnings()

yield None

diagnostics.clear_warnings()

diagnostics.set_dev_mode(False)

# ======================================================================

# Multi-child components (None / list returns)

# ======================================================================

def test_component_returning_none_mounts_nothing() -> None:

@component

def Nothing() -> Any:

return None

rec, backend = _make_reconciler()

root = rec.mount(Element("Column", {}, [Nothing()]))

assert root.children == []

assert backend.live_view_count() == 1 # just the Column

def test_component_returning_list_mounts_all_siblings() -> None:

@component

def Pair() -> Any:

return [

Element("Text", {"text": "one"}, []),

Element("Text", {"text": "two"}, []),

]

rec, _backend = _make_reconciler()

root = rec.mount(Element("Column", {}, [Pair()]))

assert [c.props["text"] for c in root.children] == ["one", "two"]

def test_component_toggling_none_and_element() -> None:

setters: Dict[str, Any] = {}

@component

def Toggle() -> Any:

visible, set_visible = use_state(False)

setters["set"] = set_visible

if not visible:

return None

return Element("Text", {"text": "now you see me"}, [])

@component

def App() -> Element:

return Element(

"Column",

{},

[

Element("Text", {"text": "header"}, []),

Toggle(),

Element("Text", {"text": "footer"}, []),

)

rec, _backend = _make_reconciler()

root = rec.mount(App())

assert [c.props["text"] for c in root.children] == ["header", "footer"]

setters["set"](True)

rec.flush_dirty()

assert [c.props["text"] for c in root.children] == [

"header",

"now you see me",

"footer",

]

setters["set"](False)

rec.flush_dirty()

assert [c.props["text"] for c in root.children] == ["header", "footer"]

def test_none_and_false_children_are_dropped() -> None:

rec, _backend = _make_reconciler()

root = rec.mount(

Element(

"Column",

{},

[

Element("Text", {"text": "a"}, []),

None,

False,

Element("Text", {"text": "b"}, []),

)

assert [c.props["text"] for c in root.children] == ["a", "b"]

def test_component_list_grows_and_shrinks() -> None:

setters: Dict[str, Any] = {}

@component

def Repeats() -> Any:

n, set_n = use_state(1)

setters["set"] = set_n

return [Element("Text", {"text": f"row {i}"}, [], key=str(i)) for i in range(n)]

rec, _backend = _make_reconciler()

root = rec.mount(Element("Column", {}, [Repeats()]))

assert len(root.children) == 1

setters["set"](3)

rec.flush_dirty()

assert [c.props["text"] for c in root.children] == ["row 0", "row 1", "row 2"]

setters["set"](2)

rec.flush_dirty()

assert [c.props["text"] for c in root.children] == ["row 0", "row 1"]

def test_keyed_fragment_moves_children_as_a_unit() -> None:

def group(name: str) -> Element:

return Fragment(

Element("Text", {"text": f"{name}-1"}, []),

Element("Text", {"text": f"{name}-2"}, []),

key=name,

)

rec, _backend = _make_reconciler()

root = rec.mount(Element("Column", {}, [group("a"), group("b")]))

assert [c.props["text"] for c in root.children] == ["a-1", "a-2", "b-1", "b-2"]

first_ids = [c.id for c in root.children]

rec.reconcile(Element("Column", {}, [group("b"), group("a")]))

assert [c.props["text"] for c in root.children] == ["b-1", "b-2", "a-1", "a-2"]

# The same native views were reordered, not recreated.

assert sorted(c.id for c in root.children) == sorted(first_ids)

# ======================================================================

# Effect phases: use_layout_effect before use_effect

# ======================================================================

def test_layout_effects_run_before_passive_effects() -> None:

order: List[str] = []

@component

def App() -> Element:

use_effect(lambda: order.append("passive"), [])

use_layout_effect(lambda: order.append("layout"), [])

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

rec, _backend = _make_reconciler()

rec.mount(App())

assert order == ["layout", "passive"]

def test_layout_effect_sees_committed_frame() -> None:

frames: List[Any] = []

@component

def App() -> Element:

ref: Ref = use_ref(None)

def read_frame() -> None:

frames.append(ref.current.frame if ref.current is not None else None)

use_layout_effect(read_frame, None)

return Element(

"Column",

{},

[Element("View", {"ref": ref, "height": 50}, [])],

)

rec, _backend = _make_reconciler()

# Viewport known up front: the mount commit runs the layout pass

# before layout effects flush, so the effect observes a real frame.

rec.set_viewport_size(300.0, 600.0)

rec.mount(App())

committed = [f for f in frames if f is not None]

assert committed, "layout effect should observe a committed frame"

frame = committed[-1]

assert (frame.width, frame.height) == (300.0, 50.0)

def test_layout_effect_cleanup_on_unmount() -> None:

cleaned: List[str] = []

@component

def Child() -> Element:

use_layout_effect(lambda: lambda: cleaned.append("layout"), [])

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

rec, _backend = _make_reconciler()

rec.mount(Element("Column", {}, [Child()]))

assert cleaned == []

rec.reconcile(Element("Column", {}, []))

assert cleaned == ["layout"]

# ======================================================================

# use_imperative_handle

# ======================================================================

def test_use_imperative_handle_publishes_and_clears() -> None:

class Controller:

def __init__(self) -> None:

self.calls: List[str] = []

def focus(self) -> None:

self.calls.append("focus")

@component

def Field(ref: Any = None) -> Element:

use_imperative_handle(ref, Controller, [])

return Element("TextInput", {}, [])

handle: Ref = Ref()

rec, _backend = _make_reconciler()

rec.mount(Element("Column", {}, [Field(ref=handle)]))

assert isinstance(handle.current, Controller)

handle.current.focus()

assert handle.current.calls == ["focus"]

rec.reconcile(Element("Column", {}, []))

assert handle.current is None, "unmount must clear the published handle"

def test_use_imperative_handle_none_ref_is_noop() -> None:

@component

def Field(ref: Any = None) -> Element:

use_imperative_handle(ref, lambda: object(), [])

return Element("TextInput", {}, [])

rec, _backend = _make_reconciler()

rec.mount(Element("Column", {}, [Field()])) # must not raise

# ======================================================================

# Reactive context

# ======================================================================

def test_context_change_rerenders_consumer_under_memo() -> None:

theme_ctx = create_context("light")

consumer_renders: List[str] = []

setters: Dict[str, Any] = {}

@component

def Leaf() -> Element:

theme = use_context(theme_ctx)

consumer_renders.append(theme)

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

@memo

@component

def Wall() -> Element:

# Memoized, props never change: would skip re-renders entirely

# if context were not reactive.

return Element("Column", {}, [Leaf()])

@component

def App() -> Element:

theme, set_theme = use_state("light")

setters["set"] = set_theme

return theme_ctx.Provider(Wall(), value=theme)

rec, backend = _make_reconciler()

rec.mount(App())

assert consumer_renders == ["light"]

setters["set"]("dark")

rec.flush_dirty()

assert consumer_renders == ["light", "dark"]

root = rec.root_view()

assert root.find_first("Text").props["text"] == "dark"

assert backend.live_view_count() > 0

def test_context_same_value_does_not_rerender_consumer() -> None:

ctx = create_context(0)

consumer_renders: List[int] = []

setters: Dict[str, Any] = {}

@component

def Leaf() -> Element:

value = use_context(ctx)

consumer_renders.append(value)

return Element("Text", {"text": str(value)}, [])

@memo

@component

def Wall() -> Element:

return Element("Column", {}, [Leaf()])

@component

def App() -> Element:

_tick, set_tick = use_state(0)

setters["set"] = set_tick

# Provider value is constant even though App re-renders.

return ctx.Provider(Wall(), value=42)

rec, _backend = _make_reconciler()

rec.mount(App())

assert consumer_renders == [42]

setters["set"](1)

rec.flush_dirty()

assert consumer_renders == [42], "unchanged context value must not re-render consumers"

def test_provider_multiple_children_render_flat() -> None:

ctx = create_context("x")

@component

def Leaf(label: str = "") -> Element:

value = use_context(ctx)

return Element("Text", {"text": f"{label}:{value}"}, [])

rec, _backend = _make_reconciler()

root = rec.mount(

Element(

"Column",

{},

[ctx.Provider(Leaf(label="a"), Leaf(label="b"), value="v")],

)

assert [c.props["text"] for c in root.children] == ["a:v", "b:v"]

# ======================================================================

# Portals

# ======================================================================

def test_portal_children_render_into_detached_overlay() -> None:

rec, backend = _make_reconciler()

root = rec.mount(

Element(

"Column",

{},

[

Element("Text", {"text": "content"}, []),

Portal(Element("Text", {"text": "floating"}, [])),

)

# The portal contributes no native child to its parent.

assert [c.props["text"] for c in root.children] == ["content"]

overlays = backend.detached_views("Portal")

assert len(overlays) == 1

texts = overlays[0].find_all("Text")

assert [t.props["text"] for t in texts] == ["floating"]

def test_portal_children_laid_out_against_viewport() -> None:

rec, backend = _make_reconciler()

rec.mount(

Element(

"Column",

{},

[

Element("Text", {"text": "content"}, []),

Portal(

Element(

"Column",

{"position": "absolute", "left": 10, "top": 20, "width": 100, "height": 40},

[],

)

rec.set_viewport_size(390.0, 844.0)

overlay = backend.detached_views("Portal")[0]

child = overlay.children[0]

assert child.frame == (10.0, 20.0, 100.0, 40.0)

def test_portal_unmount_destroys_overlay() -> None:

setters: Dict[str, Any] = {}

@component

def App() -> Element:

show, set_show = use_state(True)

setters["set"] = set_show

children = [Element("Text", {"text": "content"}, [])]

if show:

children.append(Portal(Element("Text", {"text": "floating"}, [])))

return Element("Column", {}, children)

rec, backend = _make_reconciler()

rec.mount(App())

assert len(backend.detached_views("Portal")) == 1

setters["set"](False)

rec.flush_dirty()

assert backend.detached_views("Portal") == []

def test_portal_state_and_events_stay_wired() -> None:

from pythonnative.events import dispatch_event

presses: List[int] = []

@component

def App() -> Element:

count, set_count = use_state(0)

return Element(

"Column",

{},

[

Element("Text", {"text": f"count:{count}"}, []),

Portal(

Element(

"Button",

{"title": "bump", "on_press": lambda: set_count(count + 1)},

[],

)

rec, backend = _make_reconciler()

root = rec.mount(App())

overlay = backend.detached_views("Portal")[0]

button = overlay.find_first("Button")

assert button is not None

handled = dispatch_event(button.tag, "on_press")

assert handled, "portal button press must reach the Python handler"

rec.flush_dirty()

assert root.find_first("Text").props["text"] == "count:1"

assert presses == [] # unused, guards against accidental capture

# ======================================================================

# Error boundary v2

# ======================================================================

def test_error_boundary_on_error_callback() -> None:

caught: List[BaseException] = []

@component

def Boom() -> Element:

raise ValueError("kapow")

rec, _backend = _make_reconciler()

rec.mount(

Element(

"Column",

{},

[

ErrorBoundary(

Boom(),

fallback=Text("failed"),

on_error=lambda exc: caught.append(exc),

)

assert len(caught) == 1

assert isinstance(caught[0], ValueError)

def test_error_boundary_fallback_receives_error_and_reset() -> None:

seen: Dict[str, Any] = {}

@component

def Boom() -> Element:

raise ValueError("kapow")

def fallback(error: BaseException, reset: Any) -> Element:

seen["error"] = error

seen["reset"] = reset

return Element("Text", {"text": f"error: {error}"}, [])

rec, _backend = _make_reconciler()

root = rec.mount(Element("Column", {}, [ErrorBoundary(Boom(), fallback=fallback)]))

assert isinstance(seen["error"], ValueError)

assert callable(seen["reset"])

assert root.find_first("Text").props["text"] == "error: kapow"

def test_error_boundary_reset_retries_children() -> None:

attempts: List[int] = []

resets: Dict[str, Any] = {}

@component

def Flaky() -> Element:

attempts.append(1)

if len(attempts) == 1:

raise ValueError("first time fails")

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

def fallback(error: BaseException, reset: Any) -> Element:

resets["reset"] = reset

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

rec, _backend = _make_reconciler()

root = rec.mount(Element("Column", {}, [ErrorBoundary(Flaky(), fallback=fallback)]))

assert root.find_first("Text").props["text"] == "failed"

resets["reset"]()

rec.flush_dirty()

assert root.find_first("Text").props["text"] == "recovered"

assert len(attempts) == 2

# ======================================================================

# use_back_handler

# ======================================================================

def test_back_handler_consumes_event() -> None:

@component

def App() -> Element:

use_back_handler(lambda: True)

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

rec, _backend = _make_reconciler()

rec.mount(App())

assert rec.dispatch_back_press() is True

def test_back_handler_pass_through_and_priority() -> None:

calls: List[str] = []

@component

def Outer() -> Element:

def handle() -> bool:

calls.append("outer")

return False # observe, do not consume

use_back_handler(handle)

return Element("Column", {}, [Inner()])

@component

def Inner() -> Element:

def handle() -> bool:

calls.append("inner")

return True

use_back_handler(handle)

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

rec, _backend = _make_reconciler()

rec.mount(Outer())

assert rec.dispatch_back_press() is True

# Effects flush children-first, so the parent registered *last* and

# dispatch (last-registered first, matching React Native) runs it

# first; it declines, then the child consumes.

assert calls == ["outer", "inner"]

def test_back_handler_unregisters_on_unmount() -> None:

setters: Dict[str, Any] = {}

@component

def Guard() -> Element:

use_back_handler(lambda: True)

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

@component

def App() -> Element:

show, set_show = use_state(True)

setters["set"] = set_show

return Element("Column", {}, [Guard() if show else None])

rec, _backend = _make_reconciler()

rec.mount(App())

assert rec.dispatch_back_press() is True

setters["set"](False)

rec.flush_dirty()

assert rec.dispatch_back_press() is False

# ======================================================================

# Hook-order guard (dev mode)

# ======================================================================

def test_conditional_hook_raises_in_dev_mode(dev_mode: Any) -> None:

setters: Dict[str, Any] = {}

@component

def Sneaky() -> Element:

flag, set_flag = use_state(False)

setters["set"] = set_flag

if flag:

use_ref(None) # extra hook appears on the second render

return Element("Text", {"text": str(flag)}, [])

rec, _backend = _make_reconciler()

rec.mount(Sneaky())

setters["set"](True)

with pytest.raises(diagnostics.HookOrderError):

rec.flush_dirty()

def test_hook_kind_swap_raises_in_dev_mode(dev_mode: Any) -> None:

setters: Dict[str, Any] = {}

@component

def Shifty() -> Element:

flag, set_flag = use_state(False)

setters["set"] = set_flag

if flag:

use_ref(None)

else:

use_state(0)

return Element("Text", {"text": str(flag)}, [])

rec, _backend = _make_reconciler()

rec.mount(Shifty())

setters["set"](True)

with pytest.raises(diagnostics.HookOrderError):

rec.flush_dirty()

def test_consistent_hooks_pass_in_dev_mode(dev_mode: Any) -> None:

setters: Dict[str, Any] = {}

@component

def Steady() -> Element:

count, set_count = use_state(0)

setters["set"] = set_count

use_ref(None)

return Element("Text", {"text": str(count)}, [])

rec, _backend = _make_reconciler()

rec.mount(Steady())

setters["set"](1)

rec.flush_dirty() # must not raise

assert rec.root_view().props["text"] == "1"

def test_hook_order_not_checked_in_production() -> None:

diagnostics.set_dev_mode(False)

setters: Dict[str, Any] = {}

@component

def Sneaky() -> Element:

flag, set_flag = use_state(False)

setters["set"] = set_flag

if flag:

use_ref(None)

return Element("Text", {"text": str(flag)}, [])

rec, _backend = _make_reconciler()

rec.mount(Sneaky())

setters["set"](True)

rec.flush_dirty() # silently tolerated in production

# ======================================================================

# Style-key validation (dev mode)

# ======================================================================

def test_unknown_style_key_warns_with_suggestion(dev_mode: Any) -> None:

Text("hi", style={"font_siez": 20}) # type: ignore[arg-type]

warnings = diagnostics.get_warnings()

assert any("font_siez" in w for w in warnings)

assert any("font_size" in w for w in warnings), "should suggest the close match"

def test_unknown_style_key_warns_once(dev_mode: Any) -> None:

Text("hi", style={"font_siez": 20}) # type: ignore[arg-type]

Text("hi again", style={"font_siez": 22}) # type: ignore[arg-type]

warnings = [w for w in diagnostics.get_warnings() if "font_siez" in w]

assert len(warnings) == 1

def test_known_style_keys_do_not_warn(dev_mode: Any) -> None:

Text("hi", style={"font_size": 20, "color": "#333333", "margin_top": 4})

assert diagnostics.get_warnings() == []

def test_style_validation_skipped_in_production() -> None:

diagnostics.set_dev_mode(False)

diagnostics.clear_warnings()

Text("hi", style={"font_siez": 20}) # type: ignore[arg-type]

assert diagnostics.get_warnings() == []

# ======================================================================

# Duplicate-key warning (dev mode)

# ======================================================================

def test_duplicate_sibling_keys_warn(dev_mode: Any) -> None:

rec, _backend = _make_reconciler()

rec.mount(

Element(

"Column",

{},

[

Element("Text", {"text": "a"}, [], key="same"),

Element("Text", {"text": "b"}, [], key="same"),

)

warnings = diagnostics.get_warnings()

assert any("same" in w and "key" in w.lower() for w in warnings)

# ======================================================================

# Diagnostics primitives

# ======================================================================

def test_warn_once_dedupes_by_key(dev_mode: Any) -> None:

diagnostics.warn_once("message one", key="k")

diagnostics.warn_once("message two", key="k")

assert diagnostics.get_warnings() == ["message one"]

def test_report_error_routes_to_last_reporter(dev_mode: Any) -> None:

seen: List[Tuple[str, str]] = []

owner_a = object()

owner_b = object()

diagnostics.set_error_reporter(owner_a, lambda exc, phase: seen.append(("a", phase)))

diagnostics.set_error_reporter(owner_b, lambda exc, phase: seen.append(("b", phase)))

try:

assert diagnostics.report_error(ValueError("x"), phase="event") is True

assert seen == [("b", "event")]

diagnostics.set_error_reporter(owner_b, None)

assert diagnostics.report_error(ValueError("y"), phase="render") is True

assert seen == [("b", "event"), ("a", "render")]

finally:

diagnostics.set_error_reporter(owner_a, None)

diagnostics.set_error_reporter(owner_b, None)

def test_report_error_without_reporter_returns_false(dev_mode: Any) -> None:

assert diagnostics.report_error(ValueError("z")) is False

def test_event_handler_error_routed_to_reporter(dev_mode: Any) -> None:

from pythonnative.events import dispatch_event

reported: List[str] = []

owner = object()

diagnostics.set_error_reporter(owner, lambda exc, phase: reported.append(phase))

try:

@component

def App() -> Element:

def explode() -> None:

raise RuntimeError("handler blew up")

return Element("Button", {"title": "x", "on_press": explode}, [])

rec, backend = _make_reconciler()

root = rec.mount(App())

dispatch_event(root.tag, "on_press")

assert reported and "on_press" in reported[0]

finally:

diagnostics.set_error_reporter(owner, None)

# ======================================================================

# Multiple screen-level roots warning

# ======================================================================

def test_multi_root_screen_warns_in_dev(dev_mode: Any) -> None:

@component

def App() -> Any:

return [

Element("Text", {"text": "one"}, []),

Element("Text", {"text": "two"}, []),

]

rec, _backend = _make_reconciler()

rec.mount(App())

warnings = diagnostics.get_warnings()

assert any("root" in w.lower() for w in warnings)

pythonnative/tests/test_core_semantics.py at main · pythonnative/pythonnative · GitHub

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