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

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"""Unit tests for the appearance module, use_color_scheme, and use_theme."""

from __future__ import annotations

from typing import Generator, List

import pytest

from pythonnative import appearance

from pythonnative.component import component

from pythonnative.element import Element

from pythonnative.hooks import use_color_scheme

from pythonnative.reconciler import Reconciler

from pythonnative.style import (

DEFAULT_DARK_THEME,

DEFAULT_LIGHT_THEME,

Theme,

ThemeContext,

default_theme,

use_theme,

)

from pythonnative.testing import FakeBackend

@pytest.fixture(autouse=True)

def _reset_appearance() -> Generator[None, None, None]:

appearance.reset_color_scheme()

yield

appearance.reset_color_scheme()

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

# appearance module

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

def test_default_scheme_is_light() -> None:

assert appearance.get_color_scheme() == "light"

assert appearance.get_system_color_scheme() == "light"

def test_system_scheme_publish_and_read() -> None:

appearance.set_system_color_scheme("dark")

assert appearance.get_color_scheme() == "dark"

assert appearance.get_system_color_scheme() == "dark"

def test_invalid_scheme_ignored() -> None:

appearance.set_system_color_scheme("sepia")

assert appearance.get_color_scheme() == "light"

appearance.set_color_scheme("sepia")

assert appearance.get_color_scheme() == "light"

def test_override_wins_over_system() -> None:

appearance.set_system_color_scheme("dark")

appearance.set_color_scheme("light")

assert appearance.get_color_scheme() == "light"

assert appearance.get_system_color_scheme() == "dark"

appearance.set_color_scheme(None)

assert appearance.get_color_scheme() == "dark"

def test_subscribers_fire_only_on_effective_change() -> None:

calls: List[int] = []

unsub = appearance.subscribe(lambda: calls.append(1))

try:

appearance.set_system_color_scheme("dark")

assert len(calls) == 1

# Override to the same effective value: no notification.

appearance.set_color_scheme("dark")

assert len(calls) == 1

# System flips underneath the override: effective unchanged.

appearance.set_system_color_scheme("light")

assert len(calls) == 1

# Clearing the override now changes the effective value.

appearance.set_color_scheme(None)

assert len(calls) == 2

finally:

unsub()

def test_unsubscribe_stops_notifications() -> None:

calls: List[int] = []

unsub = appearance.subscribe(lambda: calls.append(1))

unsub()

appearance.set_system_color_scheme("dark")

assert calls == []

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

# use_color_scheme

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

def test_use_color_scheme_returns_current_value() -> None:

appearance.set_system_color_scheme("dark")

seen: List[str] = []

@component

def comp() -> Element:

seen.append(use_color_scheme())

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

Reconciler(FakeBackend()).mount(comp())

assert seen[0] == "dark"

def test_use_color_scheme_re_renders_on_change() -> None:

seen: List[str] = []

@component

def comp() -> Element:

seen.append(use_color_scheme())

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

rec = Reconciler(FakeBackend())

rec.on_render_requested = lambda: None

rec.mount(comp())

before = len(seen)

appearance.set_system_color_scheme("dark")

rec.flush_dirty()

assert len(seen) > before

assert seen[-1] == "dark"

def test_use_color_scheme_outside_component_raises() -> None:

with pytest.raises(RuntimeError):

use_color_scheme()

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

# use_theme / default_theme

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

def test_default_theme_selects_by_scheme() -> None:

assert default_theme("light") is DEFAULT_LIGHT_THEME

assert default_theme("dark") is DEFAULT_DARK_THEME

assert default_theme("unknown") is DEFAULT_LIGHT_THEME

def test_use_theme_follows_system_scheme() -> None:

seen: List[Theme] = []

@component

def comp() -> Element:

seen.append(use_theme())

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

rec = Reconciler(FakeBackend())

rec.on_render_requested = lambda: None

rec.mount(comp())

assert seen[-1] is DEFAULT_LIGHT_THEME

appearance.set_system_color_scheme("dark")

rec.flush_dirty()

assert seen[-1] is DEFAULT_DARK_THEME

def test_use_theme_provider_pins_explicit_theme() -> None:

custom = DEFAULT_LIGHT_THEME.replace(text_color="#ABCDEF")

seen: List[Theme] = []

@component

def consumer() -> Element:

seen.append(use_theme())

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

@component

def app() -> Element:

return ThemeContext.Provider(custom, consumer())

rec = Reconciler(FakeBackend())

rec.on_render_requested = lambda: None

rec.mount(app())

assert seen[-1] is custom

# A scheme flip must not displace an explicitly provided theme.

appearance.set_system_color_scheme("dark")

rec.flush_dirty()

assert seen[-1] is custom

def test_use_theme_rejects_untyped_provider_values() -> None:

@component

def consumer() -> Element:

use_theme()

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

@component

def app() -> Element:

return ThemeContext.Provider({"text_color": "#ABCDEF"}, consumer())

rec = Reconciler(FakeBackend())

rec.on_render_requested = lambda: None

with pytest.raises(TypeError, match="expects a pn.Theme"):

rec.mount(app())

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

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