pythonnative/tests/test_bridge.py at docs-codegen-cli · abel05-droid/pythonnative · GitHub

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"""Tests for the native bridge: codec, transport routing, view backend, modules, hosts.

Everything here runs against ``FakeTransport``, which decodes the same

JSON the Swift and Kotlin runtimes receive. The tests therefore pin the

wire protocol described in ``docs/concepts/bridge.md`` from the Python

side: what a commit serializes to, how events and module results come

back, and how the on-device screen host drives navigation.

"""

from __future__ import annotations

import asyncio

import inspect

import math

import types

from typing import Any, Dict, Generator, List

import pytest

import pythonnative as pn

from pythonnative import bridge

from pythonnative.bridge import codec

from pythonnative.bridge.fake import FakeTransport

from pythonnative.component import component

from pythonnative.element import Element

from pythonnative.hooks import use_state

from pythonnative.mutations import CreateOp, DestroyOp, InsertOp, Mutation, SetFrameOp, UpdateOp

from pythonnative.native_modules import registry as modules

from pythonnative.native_views import get_registry, set_registry

from pythonnative.native_views.bridge_backend import BridgeBackend, NativeViewRef

from pythonnative.reconciler import Reconciler

from pythonnative.sdk.schema import COMPONENTS

@pytest.fixture

def transport() -> Generator[FakeTransport, None, None]:

fake = FakeTransport()

bridge.set_transport(fake)

backend = BridgeBackend(fake)

set_registry(backend)

modules._reset_for_tests()

yield fake

modules._reset_for_tests()

set_registry(None)

bridge._reset_for_tests()

@pytest.fixture

def backend(transport: FakeTransport) -> BridgeBackend:

reg = get_registry()

assert isinstance(reg, BridgeBackend)

return reg

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

# Codec

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

def test_to_jsonable_normalizes_python_only_values() -> None:

value = {

"events": frozenset({"on_press", "on_change"}),

"pair": (1, 2),

"inf": math.inf,

"neg": -math.inf,

"nan": math.nan,

"nested": [{"a": (True, None)}],

}

out = codec.to_jsonable(value)

assert out["events"] == ["on_change", "on_press"]

assert out["pair"] == [1, 2]

assert out["inf"] == "inf"

assert out["neg"] == "-inf"

assert out["nan"] is None

assert out["nested"] == [{"a": [True, None]}]

codec.dumps(out) # must be JSON-serializable

def test_to_jsonable_rejects_callables() -> None:

with pytest.raises(TypeError):

codec.to_jsonable({"on_bind_row": lambda i: i})

def test_split_props_keeps_callables_python_side() -> None:

fn = lambda i: i # noqa: E731

wire, python = codec.split_props({"count": 3, "on_bind_row": fn, "obj": object()})

assert wire == {"count": 3}

assert python["on_bind_row"] is fn

assert "obj" in python

def test_encode_transaction_shapes() -> None:

render = lambda i: i # noqa: E731

ops: List[Mutation] = [

CreateOp(1, "Column", {"flex": 1, "_pn_events": frozenset({"on_press"})}),

CreateOp(2, "VirtualList", {"count": 2, "on_bind_row": render}),

UpdateOp(1, {"flex": None, "padding": 4}),

InsertOp(1, 2, 0),

SetFrameOp(2, 0, 0, 100.5, math.nan),

DestroyOp(2),

]

text, sidecar = codec.encode_transaction(ops)

decoded = codec.loads(text)

assert decoded == [

["c", 1, "Column", {"flex": 1, "_pn_events": ["on_press"]}],

["c", 2, "VirtualList", {"count": 2}],

["u", 1, {"flex": None, "padding": 4}],

["i", 1, 2, 0],

["f", 2, 0.0, 0.0, 100.5, 0.0],

["d", 2],

]

assert sidecar == [(2, {"on_bind_row": render})]

def test_loads_handles_empty_and_bytes() -> None:

assert codec.loads(None) is None

assert codec.loads("") is None

assert codec.loads(b'{"a": 1}') == {"a": 1}

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

# Transport selection and handshake

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

def test_get_transport_off_device_raises() -> None:

bridge._reset_for_tests()

with pytest.raises(RuntimeError, match="off-device"):

bridge.get_transport()

assert bridge.has_transport() is False

def test_handshake_accepts_matching_version(transport: FakeTransport) -> None:

assert bridge.handshake() == bridge.PROTOCOL_VERSION

def test_handshake_rejects_mismatch() -> None:

fake = FakeTransport(version=bridge.PROTOCOL_VERSION + 1)

bridge.set_transport(fake)

try:

with pytest.raises(RuntimeError, match="protocol mismatch"):

bridge.handshake()

finally:

bridge._reset_for_tests()

def test_set_transport_installs_callback(transport: FakeTransport) -> None:

assert transport.callback is bridge.native_callback

assert bridge.get_transport() is transport

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

# Main-queue posting

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

def test_application_callbacks_do_not_cross_the_native_bridge(transport: FakeTransport) -> None:

import threading

from pythonnative import runtime

runtime.start()

done = threading.Event()

threads: List[str] = []

runtime.call_on_application_thread(lambda: threads.append(threading.current_thread().name))

runtime.call_on_application_thread(done.set)

assert done.wait(2)

assert threads == ["PythonNative"]

assert not any(module == "Host" and method == "post" for module, method, _ in transport.calls)

def test_application_callback_runs_inline_on_its_owner(transport: FakeTransport) -> None:

from pythonnative import runtime

runtime.start()

async def check() -> list[int]:

order = [1]

runtime.call_on_application_thread(lambda: order.append(2))

order.append(3)

return order

assert runtime.run_blocking(check()) == [1, 2, 3]

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

# View backend

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

def test_backend_applies_transaction_and_tracks_tags(backend: BridgeBackend, transport: FakeTransport) -> None:

backend.apply_mutations(

[

CreateOp(1, "Column", {"flex": 1}),

CreateOp(2, "Text", {"text": "hi", "_pn_events": frozenset({"on_press"})}),

InsertOp(1, 2, 0),

SetFrameOp(2, 8, 8, 100, 20),

]

)

assert len(transport.transactions) == 1

assert transport.views[1].type_name == "Column"

assert transport.views[1].children == [transport.views[2]]

assert transport.views[2].props == {"text": "hi", "_pn_events": ["on_press"]}

assert transport.views[2].frame == (8.0, 8.0, 100.0, 20.0)

ref = backend.resolve_view(2)

assert isinstance(ref, NativeViewRef) and ref.tag == 2 and ref.type_name == "Text"

assert backend.live_view_count() == 2

backend.apply_mutations([UpdateOp(2, {"text": None, "color": "#fff"}), DestroyOp(2)])

assert 2 not in transport.views

assert backend.resolve_view(2) is None

assert backend.live_view_count() == 1

def test_backend_measure_command_and_animation(backend: BridgeBackend, transport: FakeTransport) -> None:

backend.apply_mutations([CreateOp(7, "Text", {"text": "x"})])

assert backend.measure_intrinsic(7, math.inf, 200) == (60.0, 16.0)

assert backend.measure_intrinsic(99, 10, 10) == (0.0, 0.0)

backend.apply_mutations([CreateOp(8, "ScrollView", {}), CreateOp(9, "TextInput", {})])

transport.command_results["get_scroll_offset"] = {"x": 0, "y": 42}

assert backend.command(8, "get_scroll_offset", {}) == {"x": 0, "y": 42}

assert backend.command(9, "focus") is None

assert transport.commands[-1] == (9, "focus", {})

with pytest.raises(TypeError, match="Unknown command"):

backend.command(7, "focus")

backend.set_animated_property(7, "opacity", 0.5)

assert transport.animations[-1] == (7, {"op": "set", "prop": "opacity", "value": 0.5})

assert backend.start_animation(7, 3, "opacity", {"type": "timing", "to": 1.0, "duration": 100}) is True

transport.animate_results["cancel"] = {"value": 0.7}

assert backend.cancel_animation(7, 3) == 0.7

assert backend.start_animation(404, 1, "opacity", {}) is False

def test_backend_holds_callable_props_in_sidecar(backend: BridgeBackend, transport: FakeTransport) -> None:

render = lambda i: Element("Text", {"text": str(i)}, []) # noqa: E731

backend.apply_mutations([CreateOp(5, "VirtualList", {"count": 3, "on_bind_row": render})])

assert transport.views[5].props == {"count": 3}

assert backend.python_props(5)["on_bind_row"] is render

backend.apply_mutations([UpdateOp(5, {"on_bind_row": None})])

assert backend.python_props(5) == {}

assert transport.views[5].props == {"count": 3}

def test_reconciler_commits_through_bridge(transport: FakeTransport) -> None:

@component

def App() -> Element:

count, set_count = use_state(0)

return pn.Column(

pn.Text(f"count={count}"),

pn.Button("+", on_press=lambda: set_count(count + 1)),

style={"flex": 1},

)

rec = Reconciler(get_registry())

rec.on_render_requested = lambda: rec.flush_dirty()

root = rec.mount(App())

rec.set_viewport_size(320, 480)

assert isinstance(root, NativeViewRef)

column = transport.views[root.tag]

assert column.type_name == "Column"

texts = transport.find("Text")

assert texts and texts[0].props["text"] == "count=0"

button = transport.find("Button")[0]

assert "on_press" in button.props["_pn_events"]

assert column.frame[2:] == (320.0, 480.0) or column.frame == (0.0, 0.0, 0.0, 0.0)

transport.fire(button.tag, "on_press")

assert transport.find("Text")[0].props["text"] == "count=1"

rec.unmount()

assert transport.views == {}

@pytest.mark.parametrize(

"name",

[

name

for name in pn.components.__all__

if name in COMPONENTS

and inspect.isfunction(getattr(pn, name))

and name

not in {

"KeyboardAvoidingView",

"SafeAreaView",

"FlatList",

"SectionList",

"ErrorBoundary",

"Fragment",

"Suspense",

}

)

def test_builtin_factory_defaults_cross_the_bridge(name: str, backend: BridgeBackend, transport: FakeTransport) -> None:

element = getattr(pn, name)()

assert isinstance(element.type, str)

backend.apply_mutations([CreateOp(1, element.type, dict(element.props))])

assert transport.views[1].type_name == element.type

if name in {"Checkbox", "DatePicker", "Picker"}:

assert transport.views[1].props["accessibility_role"] == ("checkbox" if name == "Checkbox" else "button")

@pytest.mark.parametrize("name", ["View", "Text", "Image"])

def test_animated_transform_shorthands_cross_the_bridge(name: str, transport: FakeTransport) -> None:

scale = pn.Animated.Value(0.5)

translate = pn.Animated.Value(10)

factory = getattr(pn.Animated, name)

children = [] if name == "View" else ["box" if name == "Text" else "https://example.com/image.png"]

rec = Reconciler(get_registry())

try:

rec.mount(factory(*children, style={"scale": scale, "translate_x": translate, "rotate": 45}))

props = transport.find(name)[0].props

assert props["transform"] == [{"scale": 0.5}, {"translate_x": 10.0}, {"rotate": 45}]

assert not {"scale", "translate_x", "rotate"} & props.keys()

finally:

rec.unmount()

def test_event_handler_return_value_is_returned_to_native(transport: FakeTransport) -> None:

from pythonnative.events import get_event_registry

get_registry().apply_mutations([CreateOp(11, "VirtualList", {})])

get_event_registry().set_events(11, {"on_bind_row": lambda payload: {"root": payload["index"] * 2}})

try:

assert transport.fire(11, "on_bind_row", {"index": 21}) == {"root": 42}

assert transport.fire(11, "on_missing") is None

finally:

get_event_registry().clear(11)

def test_destroyed_view_drops_queued_event(transport: FakeTransport) -> None:

from pythonnative.events import get_event_registry

backend = get_registry()

backend.apply_mutations([CreateOp(50, "Button", {"title": "Press"})])

seen: list[str] = []

get_event_registry().set_events(50, {"on_press": lambda: seen.append("press")})

transport.fire(50, "on_press")

backend.apply_mutations([DestroyOp(50)])

transport.fire(50, "on_press")

assert seen == ["press"]

def test_animation_completion_callback_routes_to_animated(

transport: FakeTransport, monkeypatch: pytest.MonkeyPatch

) -> None:

from pythonnative import animated

seen: List[Any] = []

monkeypatch.setattr(

animated, "native_animation_completed", lambda anim_id, finished=True: seen.append((anim_id, finished))

)

transport.complete_animation(9, finished=False)

assert seen == [(9, False)]

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

# Native modules

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

def test_bridge_module_sync_call_and_error(transport: FakeTransport) -> None:

def clipboard(method: str, args: Dict[str, Any]) -> Any:

if method == "get_string":

return "pasted"

raise ValueError("nope")

transport.module_handlers["Clipboard"] = clipboard

module = modules.native_module("Clipboard")

assert isinstance(module, modules.BridgeModule)

assert module.call("get_string") == "pasted"

assert transport.calls[-1] == ("Clipboard", "get_string", {})

with pytest.raises(modules.NativeModuleError, match="nope"):

module.call("set_string", text="x")

def test_bridge_module_pending_call_resolves_later(transport: FakeTransport) -> None:

transport.module_handlers["Camera"] = lambda method, args: FakeTransport.pending()

async def scenario() -> Any:

task = asyncio.ensure_future(modules.native_module("Camera").call_async("take_photo", quality=0.8))

await asyncio.sleep(0)

_module, call_id, method, args = transport.pending_calls[0]

assert method == "take_photo" and args == {"quality": 0.8, "allow_editing": False}

transport.resolve_pending(call_id, "/tmp/photo.jpg")

return await task

assert asyncio.run(scenario()) == "/tmp/photo.jpg"

def test_bridge_module_pending_call_rejects(transport: FakeTransport) -> None:

transport.module_handlers["Biometrics"] = lambda method, args: FakeTransport.pending()

async def scenario() -> None:

task = asyncio.ensure_future(modules.native_module("Biometrics").call_async("authenticate", reason="x"))

await asyncio.sleep(0)

transport.resolve_pending(transport.pending_calls[0][1], error="cancelled")

await task

with pytest.raises(modules.NativeModuleError, match="cancelled"):

asyncio.run(scenario())

def test_facades_use_bridge_modules_on_device(transport: FakeTransport) -> None:

store: Dict[str, str] = {}

def secure(method: str, args: Dict[str, Any]) -> Any:

if method == "set_item":

store[args["key"]] = args["value"]

return True

if method == "get_item":

return store.get(args["key"])

return store.pop(args["key"], None) is not None

transport.module_handlers["SecureStore"] = secure

assert pn.SecureStore.set_item("token", "abc") is None

assert pn.SecureStore.get_item("token") == "abc"

assert pn.SecureStore.delete_item("token") is True

assert pn.SecureStore.get_item("token") is None

def test_facade_surfaces_native_errors(transport: FakeTransport) -> None:

"""Facades don't turn a rejected native call into a default value."""

def failing(method: str, args: Dict[str, Any]) -> Any:

raise RuntimeError("keychain locked")

transport.module_handlers["SecureStore"] = failing

with pytest.raises(modules.NativeModuleError, match="keychain locked"):

pn.SecureStore.get_item("token")

transport.module_handlers["Clipboard"] = failing

with pytest.raises(modules.NativeModuleError, match="keychain locked"):

pn.Clipboard.get_string()

def test_module_event_from_native_reaches_listeners(transport: FakeTransport) -> None:

seen: List[Any] = []

unsubscribe = modules.native_module("NetInfo").add_listener("change", seen.append)

transport.emit_module_event("NetInfo", "change", {"is_connected": False, "type": "none"})

assert seen == [{"is_connected": False, "type": "none"}]

unsubscribe()

transport.emit_module_event("NetInfo", "change", {})

assert len(seen) == 1

def test_python_module_registration_and_entry_points_off_device() -> None:

modules._reset_for_tests()

bridge._reset_for_tests()

class Weather:

def forecast(self, city: str) -> str:

return f"sunny in {city}"

async def slow(self) -> int:

return 7

modules.register_python_module("Weather", Weather)

module = modules.native_module("Weather")

assert isinstance(module, modules.PythonModule)

assert module.call("forecast", city="Oslo") == "sunny in Oslo"

with pytest.raises(RuntimeError, match="asynchronous"):

module.call("slow")

assert asyncio.run(module.call_async("slow")) == 7

with pytest.raises(modules.NativeModuleError, match="unknown method"):

module.call("missing")

modules.unregister_python_module("Weather")

# Facades call native_module() at import time, so a missing fallback

# implementation only surfaces on the first method call.

unresolved = modules.native_module("Weather")

with pytest.raises(KeyError):

unresolved.call("forecast", city="Oslo")

# Registering afterwards makes the same facade handle work.

modules.register_python_module("Weather", Weather)

assert unresolved.call("forecast", city="Oslo") == "sunny in Oslo"

modules._reset_for_tests()

def test_fallback_defaults_resolve_for_every_builtin() -> None:

modules._reset_for_tests()

bridge._reset_for_tests()

for name in (

"Device",

"AppState",

"Storage",

"SecureStore",

"Clipboard",

"Alert",

"Share",

"Linking",

"Haptics",

"Battery",

"NetInfo",

"Permissions",

"Notifications",

"Camera",

"Location",

"Biometrics",

assert isinstance(modules.native_module(name), modules.PythonModule), name

assert modules.native_module("Device").call("info")["platform"] == "test"

modules._reset_for_tests()

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

# On-device screen host

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

def _install_app(monkeypatch: pytest.MonkeyPatch, name: str, root: Any) -> str:

import sys

module = types.ModuleType(name)

module.App = root # type: ignore[attr-defined]

monkeypatch.setitem(sys.modules, name, module)

return name

def test_native_host_lifecycle_and_navigation(transport: FakeTransport, monkeypatch: pytest.MonkeyPatch) -> None:

from pythonnative import platform_metrics

from pythonnative.hosts import native as hosts

hosts._reset_for_tests()

@component

def Root() -> Element:

return pn.Column(pn.Text("hello"), style={"flex": 1})

path = _install_app(monkeypatch, "bridge_host_app", Root)

metrics = {

"width": 390.0,

"height": 844.0,

"insets": {"top": 0, "left": 0, "bottom": 34, "right": 0},

"color_scheme": "dark",

}

result = transport.host_event(1, "create", {"path": path, "args": None, "dev_root": None, **metrics})

host = hosts.host_for_screen(1)

assert host is not None and host.reconciler is not None

root_tag = result["root"]

assert transport.views[root_tag].type_name == "Column"

assert ("Host", "attach_root", {"screen": 1, "tag": root_tag}) in transport.calls

assert platform_metrics.get_safe_area_insets().bottom == 34.0

assert platform_metrics.get_window_dimensions() == (390.0, 844.0)

assert pn.appearance.get_system_color_scheme() == "dark"

assert host.reconciler.viewport_size == (390.0, 844.0)

transport.host_event(1, "layout", {"width": 844.0, "height": 390.0})

assert host.reconciler.viewport_size == (844.0, 390.0)

transport.host_event(1, "pause")

assert host.is_focused is False

transport.host_event(1, "save_state")

transport.host_event(1, "restore_state", {"state": "{}"})

transport.host_event(1, "save_state")

transport.host_event(1, "restore_state", {"state": "{}"})

transport.host_event(1, "resume", {"width": 390.0, "height": 844.0})

assert host.is_focused is True

assert transport.host_event(1, "back_pressed") is None

assert transport.calls[-1] == ("Host", "finish", {"screen": 1})

host.set_screen_options({"title": "T"})

assert transport.calls[-1] == ("Host", "set_options", {"screen": 1, "options": {"title": "T"}})

transport.host_event(1, "destroy")

assert hosts.host_for_screen(1) is None

assert transport.views == {}

pn.appearance.reset_color_scheme()

platform_metrics.reset_safe_area_insets()

platform_metrics.reset_window_dimensions()

def test_native_host_defers_renders_to_application_loop(

transport: FakeTransport, monkeypatch: pytest.MonkeyPatch

) -> None:

from pythonnative.hosts import native as hosts

hosts._reset_for_tests()

setters: List[Any] = []

@component

def Root() -> Element:

n, set_n = use_state(0)

setters.append(set_n)

return pn.Text(f"n={n}")

path = _install_app(monkeypatch, "bridge_host_defer_app", Root)

transport.host_event(2, "create", {"path": path, "width": 100, "height": 100})

assert transport.find("Text")[0].props["text"] == "n=0"

setters[-1](5)

# The state change is committed on the next main-queue turn, not inline.

assert transport.find("Text")[0].props["text"] == "n=0"

from pythonnative.runtime import drain

drain()

assert transport.find("Text")[0].props["text"] == "n=5"

transport.host_event(2, "destroy")

def test_drawing_only_commit_skips_layout_until_geometry_changes(

backend: BridgeBackend, transport: FakeTransport

) -> None:

from pythonnative.profiling import Profiler

def layout(_method: str, _args: Dict[str, Any]) -> Dict[str, Any]:

identity = transport.commit_state.acknowledgement()

identity.pop("ok")

return identity | {"frames": [], "metrics": {"layout_ns": 1000, "views": 1}}

transport.module_handlers["Layout"] = layout

with Profiler() as profiler:

backend.apply_mutations([CreateOp(91, "Text", {"text": "before"})])

backend.compute_layout([91], 300, 500)

backend.apply_mutations([UpdateOp(91, {"color": "#ff0000", "opacity": 0.5})])

backend.compute_layout([91], 300, 500)

assert profiler.counters["layout.requests"] == 1

backend.apply_mutations([UpdateOp(91, {"text": "a longer label"})])

backend.compute_layout([91], 300, 500)

assert profiler.counters["layout.requests"] == 2

backend.compute_layout([91], 500, 300)

assert profiler.counters["layout.requests"] == 3

assert profiler.counters["native.layout.views"] == 3

def test_geometry_from_an_obsolete_revision_cannot_update_the_tree(backend: BridgeBackend) -> None:

accepted: list[Any] = []

backend.on_layout = accepted.append

backend.apply_mutations([CreateOp(92, "Text", {"text": "before"})])

identity = backend._commit.acknowledgement()

identity.pop("ok")

backend.apply_mutations([UpdateOp(92, {"text": "after"})])

backend.accept_layout(identity | {"frames": [[92, 0, 0, 10, 10]]})

assert accepted == []

current = backend._commit.acknowledgement()

current.pop("ok")

backend.accept_layout(current | {"frames": [[92, 0, 0, 20, 10]]})

assert accepted == [[[92, 0, 0, 20, 10]]]

pythonnative/tests/test_bridge.py at docs-codegen-cli · abel05-droid/pythonnative · GitHub

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