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

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"""Unit tests for the native_views package.

Tests the registry's batched ``apply_mutations`` commit channel, the tag

table, the base handler protocol, and shared utility functions.

Platform-specific handlers (android/ios) are not tested here since they

require their respective runtime environments; they are exercised by

E2E tests on device.

"""

import itertools

from typing import Any, Dict, Tuple

import pytest

from pythonnative.layout import LAYOUT_STYLE_KEYS

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

from pythonnative.native_views import NativeViewRegistry, set_registry

from pythonnative.native_views.base import (

ViewHandler,

parse_color_int,

)

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

# parse_color_int

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

def test_parse_color_hex6() -> None:

result = parse_color_int("#FF0000")

assert result == parse_color_int("FF0000")

expected = int("FFFF0000", 16)

if expected > 0x7FFFFFFF:

expected -= 0x100000000

assert result == expected

def test_parse_color_hex8() -> None:

result = parse_color_int("#80FF0000")

raw = int("80FF0000", 16)

expected = raw - 0x100000000 # signed conversion

assert result == expected

def test_parse_color_int_passthrough() -> None:

assert parse_color_int(0x00FF00) == 0x00FF00

def test_parse_color_signed_conversion() -> None:

result = parse_color_int("#FFFFFFFF")

assert result < 0

def test_parse_color_with_whitespace() -> None:

assert parse_color_int(" #FF0000 ") == parse_color_int("#FF0000")

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

# Layout-engine ownership

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

def test_layout_style_keys_includes_flex_props() -> None:

"""All flex / sizing props are owned by the layout engine, not handlers."""

for key in (

"width",

"height",

"flex",

"flex_grow",

"flex_shrink",

"flex_basis",

"flex_direction",

"flex_wrap",

"justify_content",

"align_items",

"align_self",

"align_content",

"padding",

"margin",

"spacing",

"gap",

"position",

"top",

"right",

"bottom",

"left",

"aspect_ratio",

assert key in LAYOUT_STYLE_KEYS

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

# ViewHandler protocol

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

def test_view_handler_create_raises() -> None:

handler = ViewHandler()

with pytest.raises(NotImplementedError):

handler.create(1, {})

def test_view_handler_update_raises() -> None:

handler = ViewHandler()

with pytest.raises(NotImplementedError):

handler.update(None, {})

def test_view_handler_child_ops_default_noop() -> None:

handler = ViewHandler()

handler.insert_child(None, None, 0)

handler.remove_child(None, None)

handler.destroy(None)

def test_view_handler_set_frame_default_noop() -> None:

"""Default ``set_frame`` is a no-op so virtual nodes can opt out."""

handler = ViewHandler()

handler.set_frame(None, 0, 0, 100, 50)

def test_view_handler_measure_intrinsic_default_zero() -> None:

"""Default ``measure_intrinsic`` returns ``(0, 0)`` for handlers without intrinsic size."""

handler = ViewHandler()

assert handler.measure_intrinsic(None, 100.0, 100.0) == (0.0, 0.0)

def test_view_handler_command_default_none() -> None:

handler = ViewHandler()

assert handler.command(None, "anything", {}) is None

def test_view_handler_animation_defaults() -> None:

"""Default animation hooks: no native driving, no presentation value."""

handler = ViewHandler()

handler.set_animated_property(None, "opacity", 0.5)

assert handler.start_animation(None, 1, "opacity", {"kind": "timing"}) is False

assert handler.cancel_animation(None, 1) is None

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

# NativeViewRegistry (tag table + apply_mutations)

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

_tags = itertools.count(1)

def _next_tag() -> int:

return next(_tags)

class StubView:

def __init__(self, tag: int, type_name: str, props: Dict[str, Any]) -> None:

self.tag = tag

self.type_name = type_name

self.props = dict(props)

self.children: list = []

self.frame: Tuple[float, float, float, float] = (0.0, 0.0, 0.0, 0.0)

self.destroyed = False

class StubHandler(ViewHandler):

def __init__(self, type_name: str = "Stub") -> None:

self.type_name = type_name

self.commands: list = []

def create(self, tag: int, props: Dict[str, Any]) -> StubView:

return StubView(tag, self.type_name, props)

def update(self, native_view: Any, changed_props: Dict[str, Any]) -> None:

native_view.props.update(changed_props)

def insert_child(self, parent: Any, child: Any, index: int) -> None:

if child in parent.children:

parent.children.remove(child)

parent.children.insert(min(index, len(parent.children)), child)

def remove_child(self, parent: Any, child: Any) -> None:

if child in parent.children:

parent.children.remove(child)

def destroy(self, native_view: Any) -> None:

native_view.destroyed = True

def set_frame(self, native_view: Any, x: float, y: float, width: float, height: float) -> None:

native_view.frame = (x, y, width, height)

def measure_intrinsic(self, native_view: Any, max_width: float, max_height: float) -> Tuple[float, float]:

# Pretend the stub view is 40x10 plus its content length.

return (min(40.0 + len(native_view.props.get("text", "")), max_width), 10.0)

def command(self, native_view: Any, name: str, args: Dict[str, Any]) -> Any:

self.commands.append((name, dict(args)))

return "ok"

def _make_registry() -> NativeViewRegistry:

reg = NativeViewRegistry()

reg.register("Text", StubHandler("Text"))

reg.register("Column", StubHandler("Column"))

return reg

def test_registry_create_registers_tag() -> None:

reg = _make_registry()

tag = _next_tag()

reg.apply_mutations([CreateOp(tag, "Text", {"text": "hello"})])

view = reg.resolve_view(tag)

assert isinstance(view, StubView)

assert view.props["text"] == "hello"

assert reg.live_view_count() == 1

def test_registry_unknown_type_is_isolated(capsys: pytest.CaptureFixture[str]) -> None:

"""A CreateOp for an unknown type is logged but does not abort the batch."""

reg = _make_registry()

bad_tag, good_tag = _next_tag(), _next_tag()

reg.apply_mutations(

[

CreateOp(bad_tag, "NonExistent", {}),

CreateOp(good_tag, "Text", {"text": "still applied"}),

]

)

captured = capsys.readouterr()

assert "CreateOp failed" in captured.err

assert reg.resolve_view(bad_tag) is None

assert reg.resolve_view(good_tag) is not None

def test_registry_update_view() -> None:

reg = _make_registry()

tag = _next_tag()

reg.apply_mutations([CreateOp(tag, "Text", {"text": "old"})])

reg.apply_mutations([UpdateOp(tag, {"text": "new"})])

assert reg.resolve_view(tag).props["text"] == "new"

def test_registry_update_unknown_tag_noop() -> None:

reg = _make_registry()

reg.apply_mutations([UpdateOp(999_999, {"a": 1})])

def test_registry_insert_child() -> None:

reg = _make_registry()

parent_tag, child_tag = _next_tag(), _next_tag()

reg.apply_mutations(

[

CreateOp(parent_tag, "Column", {}),

CreateOp(child_tag, "Text", {"text": "x"}),

InsertOp(parent_tag, child_tag, 0),

]

)

parent = reg.resolve_view(parent_tag)

child = reg.resolve_view(child_tag)

assert parent.children == [child]

def test_registry_child_ops_unknown_tags_noop() -> None:

reg = _make_registry()

reg.apply_mutations([InsertOp(111_111, 222_222, 0)])

def test_registry_destroy_releases_tag_and_calls_handler() -> None:

reg = _make_registry()

tag = _next_tag()

reg.apply_mutations([CreateOp(tag, "Text", {"text": "x"})])

view = reg.resolve_view(tag)

reg.apply_mutations([DestroyOp(tag)])

assert view.destroyed is True

assert reg.resolve_view(tag) is None

assert reg.live_view_count() == 0

def test_registry_set_frame_dispatches_to_handler() -> None:

reg = _make_registry()

tag = _next_tag()

reg.apply_mutations(

[

CreateOp(tag, "Text", {"text": "x"}),

SetFrameOp(tag, 5.0, 10.0, 100.0, 50.0),

]

)

assert reg.resolve_view(tag).frame == (5.0, 10.0, 100.0, 50.0)

def test_registry_set_frame_unknown_tag_noop() -> None:

reg = _make_registry()

reg.apply_mutations([SetFrameOp(999_999, 0, 0, 100, 50)])

def test_registry_ops_apply_in_order() -> None:

"""One transaction may create, attach, frame, and update in sequence."""

reg = _make_registry()

parent_tag, child_tag = _next_tag(), _next_tag()

reg.apply_mutations(

[

CreateOp(parent_tag, "Column", {}),

CreateOp(child_tag, "Text", {"text": "a"}),

InsertOp(parent_tag, child_tag, 0),

UpdateOp(child_tag, {"text": "b"}),

SetFrameOp(child_tag, 0.0, 0.0, 60.0, 16.0),

]

)

child = reg.resolve_view(child_tag)

assert child.props["text"] == "b"

assert child.frame == (0.0, 0.0, 60.0, 16.0)

assert reg.resolve_view(parent_tag).children == [child]

def test_registry_measure_intrinsic_dispatches() -> None:

reg = _make_registry()

tag = _next_tag()

reg.apply_mutations([CreateOp(tag, "Text", {"text": "abc"})])

w, h = reg.measure_intrinsic(tag, 1000.0, 1000.0)

assert w == 43.0 # 40 + 3

assert h == 10.0

def test_registry_measure_intrinsic_unknown_tag_zero() -> None:

reg = _make_registry()

assert reg.measure_intrinsic(999_999, 1000.0, 1000.0) == (0.0, 0.0)

def test_registry_command_dispatches_by_tag() -> None:

reg = NativeViewRegistry()

handler = StubHandler("Text")

reg.register("Text", handler)

tag = _next_tag()

reg.apply_mutations([CreateOp(tag, "Text", {"text": "x"})])

result = reg.command(tag, "focus", {"select_all": True})

assert result == "ok"

assert handler.commands == [("focus", {"select_all": True})]

def test_registry_command_unknown_tag_none() -> None:

reg = _make_registry()

assert reg.command(999_999, "focus") is None

def test_registry_animation_hooks_resolve_through_tag_table() -> None:

class AnimHandler(StubHandler):

def __init__(self) -> None:

super().__init__("Text")

self.applied: list = []

self.started: list = []

self.cancelled: list = []

def set_animated_property(self, native_view: Any, prop_name: str, value: Any) -> None:

self.applied.append((prop_name, value))

def start_animation(self, native_view: Any, anim_id: int, prop_name: str, spec: Dict[str, Any]) -> bool:

self.started.append((anim_id, prop_name))

return True

def cancel_animation(self, native_view: Any, anim_id: int) -> Any:

self.cancelled.append(anim_id)

return 0.5

reg = NativeViewRegistry()

handler = AnimHandler()

reg.register("Text", handler)

tag = _next_tag()

reg.apply_mutations([CreateOp(tag, "Text", {})])

reg.set_animated_property(tag, "opacity", 0.7)

assert handler.applied == [("opacity", 0.7)]

assert reg.start_animation(tag, 1, "opacity", {"kind": "timing"}) is True

assert handler.started == [(1, "opacity")]

assert reg.cancel_animation(tag, 1) == 0.5

# Unknown tags: animation hooks are safe no-ops.

reg.set_animated_property(999_999, "opacity", 1.0)

assert reg.start_animation(999_999, 2, "opacity", {}) is False

assert reg.cancel_animation(999_999, 2) is None

def test_set_registry_injects() -> None:

reg = NativeViewRegistry()

set_registry(reg)

from pythonnative.native_views import _registry

assert _registry is reg

set_registry(None)

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

# _tripwire_log rate limiter

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

@pytest.fixture

def _tripwire_state() -> Any:

"""Reset the per-label tripwire state before each test."""

import pythonnative.native_views as nv

nv._TRIPWIRE_LAST_LOG_TIME.clear()

nv._TRIPWIRE_SUPPRESSED_COUNT.clear()

yield nv

nv._TRIPWIRE_LAST_LOG_TIME.clear()

nv._TRIPWIRE_SUPPRESSED_COUNT.clear()

def test_tripwire_log_first_call_emits(capsys: pytest.CaptureFixture[str], _tripwire_state: Any) -> None:

_tripwire_state._tripwire_log("test:basic", "first message")

captured = capsys.readouterr()

assert "first message" in captured.err

def test_tripwire_log_subsequent_within_window_suppressed(

capsys: pytest.CaptureFixture[str], _tripwire_state: Any

) -> None:

_tripwire_state._tripwire_log("test:burst", "first")

capsys.readouterr()

_tripwire_state._tripwire_log("test:burst", "second")

_tripwire_state._tripwire_log("test:burst", "third")

captured = capsys.readouterr()

assert captured.err == ""

assert _tripwire_state._TRIPWIRE_SUPPRESSED_COUNT["test:burst"] == 2

def test_tripwire_log_after_window_emits_with_summary(

monkeypatch: pytest.MonkeyPatch,

capsys: pytest.CaptureFixture[str],

_tripwire_state: Any,

) -> None:

"""After the window expires, the next emit includes a ``+N similar`` suffix."""

import time as _time

monkeypatch.setattr(_tripwire_state, "_TRIPWIRE_RATE_LIMIT_S", 0.05)

_tripwire_state._tripwire_log("test:summary", "first sample")

capsys.readouterr()

_tripwire_state._tripwire_log("test:summary", "suppressed-A")

_tripwire_state._tripwire_log("test:summary", "suppressed-B")

_time.sleep(0.06)

_tripwire_state._tripwire_log("test:summary", "third sample")

captured = capsys.readouterr()

assert "third sample" in captured.err

assert "+2 similar" in captured.err

assert _tripwire_state._TRIPWIRE_SUPPRESSED_COUNT["test:summary"] == 0

def test_tripwire_log_distinct_labels_independent(capsys: pytest.CaptureFixture[str], _tripwire_state: Any) -> None:

"""A burst on one label must not silence a different label's first emit."""

_tripwire_state._tripwire_log("test:a", "from a")

_tripwire_state._tripwire_log("test:a", "still a, suppressed")

_tripwire_state._tripwire_log("test:b", "from b")

captured = capsys.readouterr()

assert "from a" in captured.err

assert "from b" in captured.err

assert "still a" not in captured.err

def test_tripwire_log_suffix_omitted_when_zero_suppressed(

monkeypatch: pytest.MonkeyPatch,

capsys: pytest.CaptureFixture[str],

_tripwire_state: Any,

) -> None:

"""The ``+N similar`` suffix only appears when at least one was suppressed."""

import time as _time

monkeypatch.setattr(_tripwire_state, "_TRIPWIRE_RATE_LIMIT_S", 0.01)

_tripwire_state._tripwire_log("test:nosuffix", "alpha")

_time.sleep(0.02)

_tripwire_state._tripwire_log("test:nosuffix", "beta")

captured = capsys.readouterr()

assert "beta" in captured.err

assert "similar" not in captured.err

def test_registry_set_frame_nan_emits_tripwire(capsys: pytest.CaptureFixture[str], _tripwire_state: Any) -> None:

"""A ``SetFrameOp`` with a NaN dimension fires the rate-limited tripwire."""

reg = _make_registry()

tag = _next_tag()

reg.apply_mutations(

[

CreateOp(tag, "Text", {"text": "x"}),

SetFrameOp(tag, 0.0, 0.0, float("nan"), 50.0),

]

)

captured = capsys.readouterr()

assert "[set_frame:nan]" in captured.err

assert "type='Text'" in captured.err

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

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