pythonnative/tests/test_navigation.py at preview-api-reference-fix · andevsr/pythonnative · GitHub

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"""Comprehensive tests for the declarative navigation system."""

from typing import Any, Dict, List

import pytest

from fake_backend import FakeBackend as MockBackend

from fake_backend import FakeView as MockView

from pythonnative.element import Element

from pythonnative.hooks import HookState, _NavigationContext, _set_hook_state, component, use_navigation

from pythonnative.navigation import (

NavigationContainer,

_build_screen_map,

_DeclarativeNavHandle,

_DrawerNavHandle,

_FocusContext,

_RouteEntry,

_ScreenDef,

_TabNavHandle,

create_drawer_navigator,

create_stack_navigator,

create_tab_navigator,

use_focus_effect,

use_route,

)

from pythonnative.reconciler import Reconciler

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

# Data structures

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

def test_screen_def_creation() -> None:

s = _ScreenDef("Home", lambda: None, {"title": "Home"})

assert s.name == "Home"

assert s.options == {"title": "Home"}

assert "Home" in repr(s)

def test_screen_def_defaults() -> None:

s = _ScreenDef("Detail", lambda: None)

assert s.options == {}

def test_route_entry() -> None:

r = _RouteEntry("Home", {"id": 42})

assert r.name == "Home"

assert r.params == {"id": 42}

assert "Home" in repr(r)

def test_route_entry_defaults() -> None:

r = _RouteEntry("Home")

assert r.params == {}

def test_build_screen_map() -> None:

screens = [

_ScreenDef("A", lambda: None),

_ScreenDef("B", lambda: None),

"not a screen",

]

result = _build_screen_map(screens)

assert set(result.keys()) == {"A", "B"}

def test_build_screen_map_empty() -> None:

assert _build_screen_map(None) == {}

assert _build_screen_map([]) == {}

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

# _DeclarativeNavHandle

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

def test_declarative_handle_navigate() -> None:

stack: List[_RouteEntry] = [_RouteEntry("Home")]

screens = {"Home": _ScreenDef("Home", lambda: None), "Detail": _ScreenDef("Detail", lambda: None)}

captured: list = []

def set_stack(val: Any) -> None:

nonlocal stack

if callable(val):

stack = val(stack)

else:

stack = val

captured.append(list(stack))

handle = _DeclarativeNavHandle(screens, lambda: stack, set_stack)

handle.navigate("Detail", {"id": 5})

assert len(captured) == 1

assert captured[0][-1].name == "Detail"

assert captured[0][-1].params == {"id": 5}

def test_declarative_handle_go_back() -> None:

stack: List[_RouteEntry] = [_RouteEntry("Home"), _RouteEntry("Detail")]

captured: list = []

def set_stack(val: Any) -> None:

nonlocal stack

if callable(val):

stack = val(stack)

else:

stack = val

captured.append(list(stack))

handle = _DeclarativeNavHandle({}, lambda: stack, set_stack)

handle.go_back()

assert len(captured[-1]) == 1

assert captured[-1][0].name == "Home"

def test_declarative_handle_go_back_stops_at_root() -> None:

stack: List[_RouteEntry] = [_RouteEntry("Home")]

captured: list = []

def set_stack(val: Any) -> None:

nonlocal stack

if callable(val):

stack = val(stack)

else:

stack = val

captured.append(list(stack))

handle = _DeclarativeNavHandle({}, lambda: stack, set_stack)

handle.go_back()

assert captured == []

assert len(stack) == 1

assert stack[0].name == "Home"

def test_declarative_handle_get_params() -> None:

stack = [_RouteEntry("Home"), _RouteEntry("Detail", {"id": 42})]

handle = _DeclarativeNavHandle({}, lambda: stack, lambda _: None)

assert handle.get_params() == {"id": 42}

def test_declarative_handle_get_params_empty_stack() -> None:

handle = _DeclarativeNavHandle({}, lambda: [], lambda _: None)

assert handle.get_params() == {}

def test_declarative_handle_reset() -> None:

stack: List[_RouteEntry] = [_RouteEntry("A"), _RouteEntry("B"), _RouteEntry("C")]

screens = {"Home": _ScreenDef("Home", lambda: None)}

captured: list = []

def set_stack(val: Any) -> None:

captured.append(val)

handle = _DeclarativeNavHandle(screens, lambda: stack, set_stack)

handle.reset("Home", {"fresh": True})

assert len(captured) == 1

assert len(captured[0]) == 1

assert captured[0][0].name == "Home"

def test_declarative_handle_navigate_unknown_raises() -> None:

handle = _DeclarativeNavHandle({"Home": _ScreenDef("Home", lambda: None)}, lambda: [], lambda _: None)

with pytest.raises(ValueError, match="Unknown route"):

handle.navigate("Missing")

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

# Native-backed delegation via host._push / host._pop

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

class _FakeHost:

"""Stub `_ScreenHost` used to assert native-push delegation."""

def __init__(self, component_path: str = "app.demo.App") -> None:

self._component_path = component_path

self.pushed: list = []

self.popped = 0

self.reset_count = 0

def _push(self, page: Any, args: Any) -> None:

self.pushed.append((page, args))

def _pop(self) -> None:

self.popped += 1

def _reset_to_root(self) -> None:

self.reset_count += 1

class _FakeHostHandle:

"""Mimics `NavigationHandle`: declarative navigators look for `_host`."""

def __init__(self, host: Any) -> None:

self._host = host

def navigate(self, route_name: str, params: Any = None) -> None:

# Forwarding fallback (should not be called for host-routed pushes).

raise AssertionError("host handle navigate() invoked unexpectedly")

def go_back(self) -> None:

raise AssertionError("host handle go_back() invoked unexpectedly")

def test_declarative_handle_native_push_when_parent_is_host() -> None:

"""A root Stack whose parent has `_host` should push via the host."""

host = _FakeHost("app.demo.App")

parent = _FakeHostHandle(host)

screens = {"Detail": _ScreenDef("Detail", lambda: None)}

set_stack_calls: list = []

def set_stack(val: Any) -> None:

set_stack_calls.append(val)

handle = _DeclarativeNavHandle(screens, lambda: [_RouteEntry("Home")], set_stack, parent=parent)

handle.navigate("Detail", {"id": 7})

assert len(host.pushed) == 1

screen_path, push_args = host.pushed[0]

assert screen_path == "app.demo.App"

assert push_args["__pn_initial_route__"] == "Detail"

assert push_args["__pn_initial_params__"] == {"id": 7}

assert set_stack_calls == [] # in-Python stack is NOT touched

def test_declarative_handle_native_pop_at_root_when_parent_is_host() -> None:

"""`go_back` on a single-entry root stack pops the host nav controller."""

host = _FakeHost()

parent = _FakeHostHandle(host)

handle = _DeclarativeNavHandle(

{"A": _ScreenDef("A", lambda: None)},

lambda: [_RouteEntry("A")],

lambda _: None,

parent=parent,

)

handle.go_back()

assert host.popped == 1

def test_declarative_handle_native_pop_falls_through_to_in_python_first() -> None:

"""In-Python pop wins when the stack has multiple entries, even on native."""

host = _FakeHost()

parent = _FakeHostHandle(host)

stack: list = [_RouteEntry("A"), _RouteEntry("B")]

set_stack_calls: list = []

def set_stack(val: Any) -> None:

if callable(val):

new = val(stack)

stack.clear()

stack.extend(new)

else:

stack.clear()

stack.extend(val)

set_stack_calls.append(list(stack))

handle = _DeclarativeNavHandle({}, lambda: stack, set_stack, parent=parent)

handle.go_back()

assert host.popped == 0 # didn't escalate to native pop

assert set_stack_calls[-1] == [_RouteEntry("A")] or set_stack_calls[-1][0].name == "A"

def test_declarative_handle_native_reset_calls_host_helpers() -> None:

"""`reset` on a root stack invokes both pop-to-root and push."""

host = _FakeHost("app.demo.App")

parent = _FakeHostHandle(host)

handle = _DeclarativeNavHandle(

{"Home": _ScreenDef("Home", lambda: None)},

lambda: [_RouteEntry("Home")],

lambda _: None,

parent=parent,

)

handle.reset("Home", {"fresh": True})

assert host.reset_count == 1

assert host.pushed[0][0] == "app.demo.App"

assert host.pushed[0][1]["__pn_initial_route__"] == "Home"

def test_declarative_handle_reset_unknown_raises() -> None:

handle = _DeclarativeNavHandle({"Home": _ScreenDef("Home", lambda: None)}, lambda: [], lambda _: None)

with pytest.raises(ValueError, match="Unknown route"):

handle.reset("Missing")

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

# Tab nav handle

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

def test_tab_handle_navigate_switches_tab() -> None:

switched: list = []

screens = {"A": _ScreenDef("A", lambda: None), "B": _ScreenDef("B", lambda: None)}

def switch_tab(name: str, params: Any = None) -> None:

switched.append((name, params))

handle = _TabNavHandle(screens, lambda: [], lambda _: None, switch_tab)

handle.navigate("B", {"x": 1})

assert switched == [("B", {"x": 1})]

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

# Drawer nav handle

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

def test_drawer_handle_open_close_toggle() -> None:

drawer_state = [False]

def set_open(val: bool) -> None:

drawer_state[0] = val

screens = {"A": _ScreenDef("A", lambda: None)}

def noop_switch(n: str, p: Any = None) -> None:

pass

handle = _DrawerNavHandle(screens, lambda: [], lambda _: None, noop_switch, set_open, lambda: drawer_state[0])

handle.open_drawer()

assert drawer_state[0] is True

handle.close_drawer()

assert drawer_state[0] is False

handle.toggle_drawer()

assert drawer_state[0] is True

handle.toggle_drawer()

assert drawer_state[0] is False

def test_drawer_handle_navigate_closes_drawer() -> None:

drawer_state = [True]

switched: list = []

def set_open(val: bool) -> None:

drawer_state[0] = val

def switch_screen(name: str, params: Any = None) -> None:

switched.append(name)

screens = {"A": _ScreenDef("A", lambda: None), "B": _ScreenDef("B", lambda: None)}

handle = _DrawerNavHandle(screens, lambda: [], lambda _: None, switch_screen, set_open, lambda: drawer_state[0])

handle.navigate("B")

assert switched == ["B"]

assert drawer_state[0] is False

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

# NavigationContainer

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

def test_navigation_container_wraps_child() -> None:

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

el = NavigationContainer(child)

assert el.type == "View"

assert el.props.get("flex") == 1

assert len(el.children) == 1

assert el.children[0] is child

def test_navigation_container_with_key() -> None:

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

el = NavigationContainer(child, key="nav")

assert el.key == "nav"

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

# create_stack_navigator

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

def test_stack_screen_creates_screen_def() -> None:

Stack = create_stack_navigator()

s = Stack.Screen("Home", component=lambda: None, options={"title": "Home"})

assert isinstance(s, _ScreenDef)

assert s.name == "Home"

def test_stack_navigator_element() -> None:

Stack = create_stack_navigator()

@component

def HomeScreen() -> Element:

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

el = Stack.Navigator(Stack.Screen("Home", component=HomeScreen))

assert isinstance(el, Element)

assert callable(el.type)

def test_stack_navigator_renders_initial_screen() -> None:

Stack = create_stack_navigator()

@component

def HomeScreen() -> Element:

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

@component

def DetailScreen() -> Element:

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Stack.Navigator(

Stack.Screen("Home", component=HomeScreen),

Stack.Screen("Detail", component=DetailScreen),

)

root = rec.mount(el)

assert any(op[0] == "create" and op[1] == "Text" for op in backend.ops)

def find_text(view: MockView) -> Any:

if view.type_name == "Text":

return view.props.get("text")

for c in view.children:

r = find_text(c)

if r:

return r

return None

assert find_text(root) == "home"

def test_stack_navigator_respects_initial_route() -> None:

Stack = create_stack_navigator()

@component

def HomeScreen() -> Element:

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

@component

def DetailScreen() -> Element:

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Stack.Navigator(

Stack.Screen("Home", component=HomeScreen),

Stack.Screen("Detail", component=DetailScreen),

initial_route="Detail",

)

root = rec.mount(el)

def find_text(view: MockView) -> Any:

if view.type_name == "Text":

return view.props.get("text")

for c in view.children:

r = find_text(c)

if r:

return r

return None

assert find_text(root) == "detail"

def test_stack_navigator_provides_navigation_context() -> None:

Stack = create_stack_navigator()

captured_nav: list = [None]

@component

def HomeScreen() -> Element:

nav = use_navigation()

captured_nav[0] = nav

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Stack.Navigator(Stack.Screen("Home", component=HomeScreen))

rec.mount(el)

assert captured_nav[0] is not None

assert hasattr(captured_nav[0], "navigate")

assert hasattr(captured_nav[0], "go_back")

assert hasattr(captured_nav[0], "get_params")

def test_stack_navigator_empty_screens() -> None:

Stack = create_stack_navigator()

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Stack.Navigator()

root = rec.mount(el)

assert root.type_name == "View"

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

# create_tab_navigator

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

def test_tab_screen_creates_screen_def() -> None:

Tab = create_tab_navigator()

s = Tab.Screen("Home", component=lambda: None, options={"title": "Home"})

assert isinstance(s, _ScreenDef)

def test_tab_navigator_renders_initial_screen() -> None:

Tab = create_tab_navigator()

@component

def HomeScreen() -> Element:

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

@component

def SettingsScreen() -> Element:

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Tab.Navigator(

Tab.Screen("Home", component=HomeScreen, options={"title": "Home"}),

Tab.Screen("Settings", component=SettingsScreen, options={"title": "Settings"}),

)

root = rec.mount(el)

def find_texts(view: MockView) -> list:

result = []

if view.type_name == "Text":

result.append(view.props.get("text"))

for c in view.children:

result.extend(find_texts(c))

return result

texts = find_texts(root)

assert "home" in texts

def test_tab_navigator_renders_native_tab_bar() -> None:

Tab = create_tab_navigator()

@component

def ScreenA() -> Element:

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

@component

def ScreenB() -> Element:

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Tab.Navigator(

Tab.Screen("TabA", component=ScreenA, options={"title": "Tab A"}),

Tab.Screen("TabB", component=ScreenB, options={"title": "Tab B"}),

)

root = rec.mount(el)

def find_tab_bar(view: MockView) -> Any:

if view.type_name == "TabBar":

return view

for c in view.children:

r = find_tab_bar(c)

if r is not None:

return r

return None

tab_bar = find_tab_bar(root)

assert tab_bar is not None

assert tab_bar.props["items"] == [

{"name": "TabA", "title": "Tab A"},

{"name": "TabB", "title": "Tab B"},

]

assert tab_bar.props["active_tab"] == "TabA"

# The callback itself is routed to the event registry; the native

# payload only carries the wired event-name set.

assert "on_tab_select" in tab_bar.props["_pn_events"]

def test_tab_navigator_forwards_tab_bar_icon() -> None:

"""`tab_bar_icon` (string or per-platform dict) reaches the TabBar element."""

Tab = create_tab_navigator()

@component

def ScreenA() -> Element:

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

@component

def ScreenB() -> Element:

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

@component

def ScreenC() -> Element:

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Tab.Navigator(

Tab.Screen(

"TabA",

component=ScreenA,

options={"title": "Tab A", "tab_bar_icon": "house.fill"},

Tab.Screen(

"TabB",

component=ScreenB,

options={

"title": "Tab B",

"tab_bar_icon": {"ios": "gearshape.fill", "android": "ic_menu_preferences"},

Tab.Screen("TabC", component=ScreenC, options={"title": "Tab C"}),

)

root = rec.mount(el)

def find_tab_bar(view: MockView) -> Any:

if view.type_name == "TabBar":

return view

for c in view.children:

r = find_tab_bar(c)

if r is not None:

return r

return None

tab_bar = find_tab_bar(root)

assert tab_bar is not None

assert tab_bar.props["items"] == [

{"name": "TabA", "title": "Tab A", "icon": "house.fill"},

{

"name": "TabB",

"title": "Tab B",

"icon": {"ios": "gearshape.fill", "android": "ic_menu_preferences"},

{"name": "TabC", "title": "Tab C"},

]

def test_tab_navigator_empty_screens() -> None:

Tab = create_tab_navigator()

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Tab.Navigator()

root = rec.mount(el)

assert root.type_name == "View"

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

# create_drawer_navigator

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

def test_drawer_screen_creates_screen_def() -> None:

Drawer = create_drawer_navigator()

s = Drawer.Screen("Home", component=lambda: None)

assert isinstance(s, _ScreenDef)

def test_drawer_navigator_renders_initial_screen() -> None:

Drawer = create_drawer_navigator()

@component

def HomeScreen() -> Element:

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

@component

def SettingsScreen() -> Element:

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Drawer.Navigator(

Drawer.Screen("Home", component=HomeScreen),

Drawer.Screen("Settings", component=SettingsScreen),

)

root = rec.mount(el)

def find_texts(view: MockView) -> list:

result = []

if view.type_name == "Text":

result.append(view.props.get("text"))

for c in view.children:

result.extend(find_texts(c))

return result

texts = find_texts(root)

assert "home" in texts

def test_drawer_navigator_switches_screens_back_and_forth() -> None:

"""Driving One->Two->One through the event registry re-renders correctly.

Regression for a CI E2E failure where the drawer demo got stuck on

"screen Two" after tapping "Go to One". The two screens are distinct

component types, so each ``navigate`` replaces the whole nested-screen

subtree; this exercises that replace path end-to-end (event dispatch ->

state setter -> ``flush_dirty`` -> reconcile) to prove the navigation

logic itself is deterministic. The on-device failure was native, not a

logic bug: the per-screen "Go to One" button lived inside the subtree

that ``navigate`` tore down, so it destroyed itself mid-tap and dropped

the follow-up touch on the loaded CI simulator. The demo now drives

navigation from a persistent control (see drawer_navigator.py); this

test guards the underlying logic so a real regression can't hide behind

that native quirk.

"""

from pythonnative.events import get_event_registry

Drawer = create_drawer_navigator()

@component

def One() -> Element:

nav = use_navigation()

return Element(

"View",

{},

[

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

Element("Button", {"title": "Go to Two", "on_press": lambda: nav.navigate("Two")}, []),

)

@component

def Two() -> Element:

nav = use_navigation()

return Element(

"View",

{},

[

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

Element("Button", {"title": "Go to One", "on_press": lambda: nav.navigate("One")}, []),

)

backend = MockBackend()

rec = Reconciler(backend)

# Wire the production render trigger so a state setter fired from an

# event callback actually re-renders, exactly as on device.

rec._screen_re_render = rec.flush_dirty

el = Drawer.Navigator(

Drawer.Screen("One", component=One, options={"title": "One"}),

Drawer.Screen("Two", component=Two, options={"title": "Two"}),

)

rec.mount(el)

def texts() -> set:

return {v.props.get("text") for v in backend.views.values() if v.type_name == "Text"}

def tag_of_button(title: str) -> int:

for v in backend.views.values():

if v.type_name == "Button" and v.props.get("title") == title:

return v.tag

raise AssertionError(f"button {title!r} not found; have {texts()}")

registry = get_event_registry()

assert "screen One" in texts()

registry.dispatch(tag_of_button("Go to Two"), "on_press")

assert texts() == {"screen Two"}, "navigate('Two') must show screen Two only"

registry.dispatch(tag_of_button("Go to One"), "on_press")

assert texts() == {"screen One"}, "navigate('One') must switch back to screen One"

def test_drawer_navigator_empty_screens() -> None:

Drawer = create_drawer_navigator()

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = Drawer.Navigator()

root = rec.mount(el)

assert root.type_name == "View"

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

# use_route

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

def test_use_route_returns_params() -> None:

stack = [_RouteEntry("Home"), _RouteEntry("Detail", {"id": 99})]

screens = {"Home": _ScreenDef("Home", lambda: None), "Detail": _ScreenDef("Detail", lambda: None)}

handle = _DeclarativeNavHandle(screens, lambda: stack, lambda _: None)

_NavigationContext._stack.append(handle)

ctx = HookState()

_set_hook_state(ctx)

try:

params = use_route()

assert params == {"id": 99}

finally:

_set_hook_state(None)

_NavigationContext._stack.pop()

def test_use_route_no_context() -> None:

ctx = HookState()

_set_hook_state(ctx)

try:

params = use_route()

assert params == {}

finally:

_set_hook_state(None)

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

# use_focus_effect

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

def test_use_focus_effect_runs_when_focused() -> None:

calls: list = []

_FocusContext._stack.append(True)

ctx = HookState()

_set_hook_state(ctx)

try:

use_focus_effect(lambda: calls.append("focused"), [])

finally:

_set_hook_state(None)

_FocusContext._stack.pop()

ctx.flush_pending_effects()

assert calls == ["focused"]

def test_use_focus_effect_skips_when_not_focused() -> None:

calls: list = []

_FocusContext._stack.append(False)

ctx = HookState()

_set_hook_state(ctx)

try:

use_focus_effect(lambda: calls.append("focused"), [])

finally:

_set_hook_state(None)

_FocusContext._stack.pop()

ctx.flush_pending_effects()

assert calls == []

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

# Integration: stack navigator with reconciler

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

def test_stack_navigator_navigate_and_go_back() -> None:

Stack = create_stack_navigator()

captured_nav: list = [None]

@component

def HomeScreen() -> Element:

nav = use_navigation()

captured_nav[0] = nav

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

@component

def DetailScreen() -> Element:

nav = use_navigation()

captured_nav[0] = nav

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

backend = MockBackend()

rec = Reconciler(backend)

renders: list = []

rec._screen_re_render = lambda: renders.append(1)

el = Stack.Navigator(

Stack.Screen("Home", component=HomeScreen),

Stack.Screen("Detail", component=DetailScreen),

)

rec.mount(el)

nav = captured_nav[0]

assert nav is not None

nav.navigate("Detail", {"id": 1})

assert len(renders) == 1

def test_stack_navigator_with_navigation_container() -> None:

Stack = create_stack_navigator()

@component

def HomeScreen() -> Element:

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

backend = MockBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

el = NavigationContainer(Stack.Navigator(Stack.Screen("Home", component=HomeScreen)))

root = rec.mount(el)

assert root.type_name == "View"

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

# Parent forwarding (nested navigators)

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

def test_declarative_handle_forwards_navigate_to_parent() -> None:

"""Unknown routes in a child navigator forward to the parent."""

parent_calls: list = []

class _MockParent:

def navigate(self, route_name: str, params: Any = None) -> None:

parent_calls.append(("navigate", route_name, params))

def go_back(self) -> None:

parent_calls.append(("go_back",))

child_screens = {"A": _ScreenDef("A", lambda: None)}

handle = _DeclarativeNavHandle(child_screens, lambda: [_RouteEntry("A")], lambda _: None, parent=_MockParent())

handle.navigate("UnknownRoute", {"key": "value"})

assert parent_calls == [("navigate", "UnknownRoute", {"key": "value"})]

def test_declarative_handle_forwards_go_back_at_root() -> None:

"""go_back at the root of a child navigator forwards to the parent."""

parent_calls: list = []

class _MockParent:

def navigate(self, route_name: str, params: Any = None) -> None:

parent_calls.append(("navigate", route_name))

def go_back(self) -> None:

parent_calls.append(("go_back",))

child_screens = {"A": _ScreenDef("A", lambda: None)}

stack: List[_RouteEntry] = [_RouteEntry("A")]

handle = _DeclarativeNavHandle(child_screens, lambda: stack, lambda _: None, parent=_MockParent())

handle.go_back()

assert parent_calls == [("go_back",)]

def test_declarative_handle_no_parent_raises_on_unknown() -> None:

"""Without a parent, unknown routes still raise ValueError."""

handle = _DeclarativeNavHandle({"A": _ScreenDef("A", lambda: None)}, lambda: [], lambda _: None)

with pytest.raises(ValueError, match="Unknown route"):

handle.navigate("Missing")

def test_tab_handle_forwards_unknown_to_parent() -> None:

parent_calls: list = []

class _MockParent:

def navigate(self, route_name: str, params: Any = None) -> None:

parent_calls.append(("navigate", route_name, params))

def go_back(self) -> None:

parent_calls.append(("go_back",))

screens = {"TabA": _ScreenDef("TabA", lambda: None)}

def noop_switch(name: str, params: Any = None) -> None:

pass

handle = _TabNavHandle(screens, lambda: [], lambda _: None, noop_switch, parent=_MockParent())

handle.navigate("ExternalRoute", {"x": 1})

assert parent_calls == [("navigate", "ExternalRoute", {"x": 1})]

def test_drawer_handle_forwards_unknown_to_parent() -> None:

parent_calls: list = []

class _MockParent:

def navigate(self, route_name: str, params: Any = None) -> None:

parent_calls.append(("navigate", route_name, params))

def go_back(self) -> None:

parent_calls.append(("go_back",))

screens = {"DrawerA": _ScreenDef("DrawerA", lambda: None)}

View remainder of file in raw view

pythonnative/tests/test_navigation.py at preview-api-reference-fix · andevsr/pythonnative · GitHub

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